JP2002325290A - Program timer unit - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a program timer unit capable of reliably performing a desired operation without troublesome time correction. A program timer unit includes: a synchronization signal input unit to which a synchronization signal for matching the current time with an external time is input; and a synchronization signal output unit to output the synchronization signal to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program timer unit used in a remote monitoring control system capable of synchronizing with an external time.

[0002]

2. Description of the Related Art A remote monitoring control system having a configuration shown in FIG. 14 is conventionally known. In this remote monitoring control system, the two-wire signal line L connected to the transmission unit C
A plurality of operation terminals B and control terminals D are connected to s. In the illustrated example, an individual switch B1 and a pattern switch B2 are provided as the operation terminal device B. An address is set for each operation terminal B and each control terminal D, and the transmission unit C identifies the operation terminal B and the control terminal D using the address.

In the above conventional remote monitoring and control system, the individual switch B1 and the pattern switch B
A program timer unit A for performing load control (timer control) for automatically blinking the lighting device L at a preset time instead of blinking the lighting device L by the operation 2 may be installed. is there. The program timer unit A converts the multiplex transmission signal through the contact input terminal G into
What is connected. In this program timer unit A, a program for specifying the on / off time of the load control and the control content such as individual control, group control or pattern control for each day of the week is recorded. Compared with the time data, when both the time data match, the built-in output relay is opened and closed to output a non-voltage contact signal. The input terminal of the contact input terminal G is connected to each of the plurality of contact signal output terminals of the program timer unit A, and the contact input terminal G transmits monitoring data according to the contact signal output from the program timer unit A. Transmit to transmission unit C,
When the transmission unit C transmits the control data corresponding to the monitoring data to the control terminal D, the load control according to the control content of the program is performed at the set time. In addition,
A remote control transformer F is connected to the program timer unit A and the contact input terminal G. The remote control transformer F reduces the AC power supply 100V to 24V and supplies an operating voltage.

However, when a plurality of such full two-wire systems are connected and used, a single program timer unit cannot be used. Therefore, it is necessary to provide enough program timer units for the connected full two-wire system. There is. However, when a plurality of program timer units are provided, time lag may occur in each of the program timer units. If the number of program timer units is not so large, it is sufficient to make corrections individually, but as the number increases, it takes more time to make corrections. Further, even when the correction is performed individually, there is a possibility that a time lag may occur in each program unit. In addition, at the time of power failure, since no power is supplied, all settings are initialized, and the time is greatly shifted. like this,
If the time of the program timer unit shifts, the administrator of the remote monitoring control system will adjust the time of each program timer unit, but if the number is small, correct the time individually. Correcting the time individually for a large number of program timer units is extremely time-consuming, and correcting them individually requires accurate time correction between multiple program timer units. Is not always the same, and it is very difficult to accurately adjust the time.

Further, when a plurality of control terminals controlled by the respective program timer units operate in conjunction with each other according to a preset pattern, if the time is shifted between the respective program units, the control is controlled. There is a possibility that such a control terminal device is not linked to a preset operation but is controlled with a time lag.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to make it possible to perform a desired operation reliably without time-consuming time correction. It is another object of the present invention to provide a program timer unit.

[0007]

In order to achieve the above object, a program timer unit according to the present invention has the following arrangement. In other words, according to the first aspect of the present invention, the operation terminal and the control terminal each having an address set are connected to the transmission unit via a two-wire signal line, and data is transmitted and received by a time division multiplex transmission signal. The transmission unit individually accesses the operation terminal and the control terminal by transmitting a transmission signal including address data to the signal line, and receives a monitoring input during a signal return period set in synchronization with the transmission signal. When receiving the monitoring data from the operation terminal, the control data is generated based on the monitoring data, and the control data is transmitted to the control terminal in which the correspondence between the operation terminal generating the monitoring data and the address is set in advance. Input means for inputting data including a load control time and a control content, which is used in a remote monitoring control system that controls a load connected to the control terminal, and Program creating means for creating a load control program based on data input by the input means, storage means for storing the created control program, time measuring means for measuring the current time, and a transmission unit via a signal line Transmission signal transmitting and receiving means for transmitting and receiving transmission signals to and from, and monitoring data sequentially generated based on the current time data output from the timing means and the control program read from the storage means, and generated by the transmission signal transmitting and receiving means. A timer control unit for transmitting the monitored data to a signal line, a synchronization signal input unit for receiving a synchronization signal for matching the current time with an external time, And a synchronizing signal output unit for outputting the signal to the outside.

According to a second aspect of the present invention, there is provided a synchronous signal detecting section for detecting that the synchronous signal is output from the synchronous signal output section.

According to a third aspect of the present invention, the synchronizing signal output section includes a current limiting section for limiting a current equal to or greater than a predetermined current value.

According to a fourth aspect of the present invention, there is provided a liquid crystal display for displaying at least the current time and the like, and an illuminating means for lighting the liquid crystal display, wherein the illuminating means is adapted to display the current time and the like. After the liquid crystal display is turned on, the light is turned off after a predetermined time has elapsed.

According to the invention of claim 5, the liquid crystal display section includes:
A synchronization signal detection display unit that indicates the detection of the synchronization signal, the synchronization signal input unit includes the synchronization signal detection unit, and the synchronization signal detection unit detects the synchronization signal when the synchronization signal detection unit detects the synchronization signal. The display unit displays that the synchronization signal is detected.

According to the sixth aspect of the present invention, the operation terminal and the control terminal each having an address set are connected to the transmission unit via a two-wire signal line, and data is transmitted and received by a time-division multiplex transmission signal. Then, the transmission unit individually accesses the operation terminal and the control terminal by transmitting a transmission signal including address data to the signal line, and during a signal return period set in synchronization with the transmission signal, the transmission unit receives the monitoring input. When receiving the monitoring data from the operating terminal, the control data is generated based on the monitoring data, and the control data is transmitted to the controlling terminal in which the correspondence between the operating terminal that generated the monitoring data and the address is set in advance. Input means for inputting data including a load control time and a control content, which is used in a remote monitoring and control system for controlling a load connected to the control terminal through transmission; Program creating means for creating a load control program based on the data input by the input means, storage means for storing the created control program, timing means for timing the current time, and a transmission unit via a signal line A transmission signal transmitting / receiving means for transmitting / receiving a transmission signal to / from, and monitoring data sequentially generated based on the current time data output from the timing means and the control program read from the storage means, and generated by the transmission signal transmitting / receiving means. And a timer control means for transmitting the monitored data to the signal line.In the program timer unit, an internal power supply unit for continuously clocking the current time by the clock means even in a state where power is not supplied from the outside. It is characterized by having.

According to a seventh aspect of the present invention, there is provided a voltage detecting section for detecting whether or not the clock section can measure the current time by detecting a voltage of the internal power supply section.

[0014] According to an eighth aspect of the present invention, the storage means is constituted by a nonvolatile memory.

According to a ninth aspect of the present invention, there is provided an external communication means for transmitting and receiving data to and from the outside, and the storage means is rewritable from the outside via the communication input means.

In the invention according to claim 10, the input means includes:
An operation check unit capable of forcibly operating the control program is provided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the program timer unit according to the present invention will be described below. First, the remote control system will be described below with reference to FIG. In this remote monitoring and control system, a plurality of operation terminals B and control terminals D are connected to a two-wire signal line Ls connected to the transmission unit C. As the operation terminal device B, an individual switch B1, a pattern switch B
2 etc. are provided. An address is set for each operation terminal B and each control terminal D, and the transmission unit C identifies the operation terminal B and the control terminal D using the address. Individual switch B1 as operation terminal B
And the pattern switch B2 each include a switch (not shown) for generating a monitoring input, and the control terminal D has a built-in relay for controlling the lighting device L as a load. Also,
The operation terminal B is provided with a confirmation light (not shown) made of a light emitting diode for confirming the operation state of the lighting device L. Here, a latching type relay is generally used, and when the control terminal D operates the relay, the relay supplies power to the relay in a pulsed manner. The control terminal device D may be of a type having a relay externally. In this case, a separately provided transformer supplies power to the relay in a pulsed manner.

The transmission unit C sends a transmission signal Vs having a format shown in FIG. 3A to the signal line Ls. The transmission signal Vs is a synchronization signal S indicating the start of signal transmission.
Y, mode data MD indicating the mode of the transmission signal Vs, address data AD for individually calling the operation terminal B and the control terminal D, and control data C for controlling the lighting device L
D, checksum data C for detecting transmission errors
S, a bipolar (± 24V) time-division multiplexed signal consisting of a signal return period WT which is a time slot for receiving a return signal (monitoring data) from the operation terminal B or the control terminal D, Data is transmitted (Fig. 3
(B)). In each operation terminal B and each control terminal D,
When the address data AD transmitted by the transmission signal Vs received via the signal line Ls matches an address preset in each operation terminal B or each control terminal D, the control data CD is converted from the transmission signal Vs. At the same time, the monitoring data is returned in the signal return period WT of the transmission signal Vs as a current mode signal (a binary signal due to a current change represented by a state where the signal line Ls is opened and a state where a low impedance is inserted). I do.

When data is transmitted from the transmission unit C to a desired operation terminal B or control terminal D, the mode data MD is set to a control mode, and an address set in the operation terminal B or control terminal D is transmitted. Address data A
D, and the transmission signal Vs is transmitted to the signal line Ls. When the operation terminal B or the control terminal D having the address corresponding to the address data AD receives the control data CD, The monitoring data is returned during the return period WT. The transmission unit C confirms that the control data CD has been transmitted to the desired operation terminal B or control terminal D based on the relationship between the transmitted control data CD and the monitoring data received during the signal return period WT. Control terminal D
Outputs a load control signal for controlling the lighting device L according to the received control data CD, and the operation terminal B outputs a monitoring signal for performing an operation confirmation display of the lighting device L according to the received control data CD.

On the other hand, the transmission unit C normally transmits the transmission signal Vs in which the mode data MD is in the dummy mode at regular time intervals (constant polling), and the operation terminal B operates the switch (not shown). When the accompanying monitoring input occurs, the operation terminal B attempts to transmit the occurrence of the monitoring input to the transmission unit C. That is, the operation terminal B generates an interrupt signal as shown in FIG. 3C in synchronization with the SY of the transmission signal Vs in the dummy mode, sets an interrupt flag at the same time, and Prepare for information transfer. When receiving the interrupt signal, the transmission unit C sets the mode data MD to the interrupt polling mode and transmits the data while sequentially increasing the upper half of the address data AD (the upper 4 bits if the address data AD is 8 bits). In the operation terminal B that has transmitted the signal and generated the interrupt signal, the upper 4 bits of the address data AD of the transmission signal in the interrupt polling mode match the upper 4 bits of the address set in the operation terminal B. At this time, the lower half bits of the address are returned to the transmission unit C during the signal return period WT. As described above, since the transmission unit C searches for 16 operation terminals B that have generated the interrupt signal collectively, the transmission terminal C can find the operation terminal B in a relatively short time.

When the transmission unit C obtains the address of the operation terminal B that has generated the interrupt signal, the mode data MD is set to the monitoring mode, and the transmission signal Vs having the obtained address data AD is transmitted to the signal line Ls. In response to the transmission signal Vs, the operation terminal device B returns information to be transmitted in the signal return period WT. Finally, the transmission unit C sends a signal for instructing an interrupt reset to the operating terminal B that has generated the interrupt signal, and releases the interrupt flag of the operating terminal B. As described above, information transmission from the operation terminal B to the transmission unit C is performed by four signal transmissions from the transmission unit C to the operation terminal B (dummy mode, interrupt polling mode, monitoring mode, interrupt reset). ) To complete. When the transmission unit C wants to know the desired operation state of the control terminal B, it is only necessary to transmit a transmission signal using the mode data MD as monitoring data.

The above operation will be briefly summarized. First, when a monitoring input associated with the operation of a switch occurs at the operation terminal B, the operation terminal B returns monitoring data corresponding to the monitoring input to the transmission unit C, and the transmission unit C transmits the control data CD to the control terminal D. Is transmitted, the control terminal D outputs a load control signal to control the lighting device. here,
The control terminal D is supplied with a load monitoring input, returns monitoring data corresponding to the load monitoring input to the transmission unit C, and transmits the returned monitoring data to the operation terminal B. The operation terminal B outputs a monitoring signal according to the transmission signal.
The monitoring output is usually used to turn on and off the confirmation lamp. E
Is a power supply circuit.

In the present embodiment, a synchronization signal is received from the outside via a synchronization signal line to make the current time coincide with the outside, and a synchronization signal is sent to another program timer unit A, whereby a plurality of program timers are sent. Timer unit A
The current time is synchronized between them. Further, by detecting and displaying the reception and transmission of the synchronization signal, it is possible to confirm that the synchronization signal has been reliably transmitted and received, and to avoid a problem such as a short circuit of the synchronization signal line. Furthermore, if the synchronization signal is short-circuited,
An excessive short-circuit current is prevented from flowing through the internal circuit.

In this embodiment, as shown in FIG. 1, an operation switch unit A19 composed of a rubber switch as an input means for inputting a control time and a control content of a load, and a control time input by the operation switch unit A19. A microcomputer (hereinafter, a microcomputer) A10, which is an information processing unit that creates a load control program based on the control content and processes data transmitted through the pair of transmission lines;
A transmission and reception of a transmission signal for transmitting and receiving a multiplex transmission signal to and from the transmission unit C via a signal line Ls, a memory A13 as a storage unit for storing the created control program, a real-time clock A14 as a time measuring means for measuring the current time, A transmission signal transmission / reception unit A17 as a means, a power supply circuit A16 for taking in a power supply for driving an internal circuit of the program timer unit A including the microcomputer A10 from the outside, and a liquid crystal for displaying at least data items that can be input by the operation switch unit A19 A liquid crystal display section A18, a synchronizing signal input section A11 to which a synchronizing signal is inputted from the outside through synchronizing signal input terminals T3 and T3, and a synchronizing signal to the outside through synchronizing signal output terminals T4 and T4. And a synchronization signal detection unit A20 for detecting that a synchronization signal has been output. , And a current limiting unit A23 to prevent excessive current from flowing when the synchronization signal is short-circuited, the.

The memory A13 is composed of an electrically rewritable non-volatile semiconductor memory (for example, EEPROM, etc.). In addition to the operation program of the microcomputer A10, a control program described later and data of sunrise time and sunset time for each area are provided. And the like, and the stored contents can be retained even when the power supply is stopped due to a power failure or the like. The transmission signal transmission / reception unit A17 is a circuit that enables data transmission with the transmission unit C via the signal line Ls of the remote monitoring and control system connected to the signal line terminals T1 and T1.

The power supply circuit A16 stabilizes the rectified and smoothed DC voltage after stepping down the AC voltage supplied from the remote control transformer F via the power supply terminals T2 and T2, thereby operating the microcomputer A10 and the like (for example, 5V). DC voltage) is generated and output. Liquid crystal display A1
Reference numeral 8 denotes a so-called segment type TN type LCD panel, which performs various displays as described later by being driven by a liquid crystal driver A31. Also,
The backlight unit A26 is composed of a plurality of light emitting diodes, and is controlled by the microcomputer A10 to blink as described later.

Further, since the power supply to which the power supply circuit A16 is connected is an AC power supply of 100 V, it can be directly connected to a commercial power supply, and there is no need to prepare a special power supply device. Since the inside is driven at 24 V, the AC power supply 100 V is supplied to the 24 V
To supply operating power to the circuit. Further, if the power supply to which the power supply circuit A16 is connected is an AC power supply of 24V, there is no need to step down the power supply and take it into the circuit. Can be achieved.

The memory A13 is composed of an electrically rewritable nonvolatile semiconductor memory (for example, an EEPROM or the like). In addition, a serial port A15 is provided as external communication means for externally rewriting an operation program and the like stored in the memory A13.
The contents of the memory A13 can be rewritten using an information processing terminal or the like capable of transmitting data to the serial port A15. Further, the memory A13 includes a flash memory, a flash ROM, and the like.
Since data such as an operation program is stored in such a nonvolatile memory, data is stored even if there is a power failure.

The liquid crystal display section A18 comprises a so-called LCD panel, and performs various kinds of display as described later by being driven by a liquid crystal driver A31.

In the program timer unit A1 of this embodiment, the microcomputer A10 is configured to store the current time data output from the real-time clock A14 and the memory A13.
A control signal for controlling the load is transmitted to a signal line based on the control time and control content described in the control program read from the control program.

By the way, as shown in FIG. 4, around the screen A8a of the liquid crystal display A18 of the program timer unit A1, "normal", "program",
The characters "special day", "clock", and "special" are written in order from the left, and the word "mode" is written at the top, and "special day 1 operation" and "special day 2 operation" are along the lower side. "
The characters "timer off", "synchronization", and "district" are written in order from the left. In addition, the portions corresponding to the characters “Normal”, “Program”, “Special Day”, “Clock”, and “Special” written along the upper side around the screen A8a of the liquid crystal display unit 8 and along the lower side Marker M can be displayed in the vicinity of the characters “special day 1 operation”, “special day 2 operation”, “timer off”, “synchronization”, and “district”, and marker M is highlighted ( (Meaning that the display color is different from the background). That is, the function being executed is indicated using the marker M.

In the program timer unit A having the above configuration, the operation of synchronizing a plurality of program timer units A will be described first. As shown in FIGS. 5 and 6, an external synchronizing signal transmitting means, which outputs a voltage of 12 V and uses one of a plurality of program timer units connected to a signal line, for example, one program timer unit, for example, Then, a synchronization signal, which is a time correction signal, is input to the synchronization input terminal of the program timer unit A1 every hour at 0 minutes. As shown in FIG. 5, the program timer unit A
1 receives this synchronization signal (step SA1),
The rising edge of the synchronizing signal is detected, and its own real-time clock A14 is made to coincide with the hour 0 minute of the external time (step SA2). Further, a timer count is performed (step SA3), and a synchronization signal is output from the output terminal.
A 12V signal is output (step SA4). The output of the synchronization signal is continued until the output time of the synchronization signal elapses 500 ms (step SA5), and the output of the synchronization signal is stopped when the output time elapses 500 ms (step SA6).
The other plurality of program timer units also operate according to this flowchart, and synchronize time between the plurality of program timer units. FIG. 6 shows the signal output timing of the synchronization signal in this operation.
It is. In this way, it is possible to connect any number of program timer units to the series. Since the current time is adjusted in such a manner, the highest-order, that is, the program timer unit to which the reference synchronization signal is input adjusts the time preferentially.

The synchronizing signal output section A12 has a synchronizing signal detecting section A20 for detecting that the synchronizing signal is actually output from the program timer unit A1, and an excessive current generated by a short circuit of the synchronizing signal. And a limiting circuit. FIG. 7 is a circuit diagram of the synchronization signal output unit A12.

The synchronizing signal detecting section A20 is provided in the synchronizing signal output section A12 and includes the photocoupler PC1, and detects the synchronizing signal by the photocoupler PC1.

Also, in order to detect the input of the synchronizing signal even when the synchronizing signal is input, the synchronizing signal input section A11 is also provided with a synchronizing signal detecting section A20 having a photocoupler PC3 shown in FIG. . Further, the synchronization signal detection unit A20 that has detected the synchronization signal is a synchronization signal detection display unit A provided in the program timer unit A1 shown in FIG.
The marker M near the "synchronous" character, which is 22, is turned on for 10 minutes.

As described above, since the synchronization signal detecting section A20 can detect the transmission and reception of the synchronization signal, when the synchronization signal is not input, the synchronization signal is detected by the synchronization signal detection display section A22. At this time, it is possible to easily determine a problem such as a short-circuit of the synchronization signal.

If the synchronizing signal is short-circuited, a short-circuit current may flow in a circuit inside the program timer unit A1. When the short-circuit current is excessive, the short-circuit current flows through the internal circuit, and there is a risk that the internal circuit itself may be broken. Therefore, a current limiter A23 is provided in the synchronous signal output unit A12, thereby limiting an excessive short-circuit current. As shown in the circuit diagram of FIG. 7, the current limiter A23 is provided in the synchronizing signal output unit A12, and operates the transistor TR1 by using the voltage stabilized by using the Zener diode ZD to control the constant voltage. Operating, providing a resistor in the collector of the transistor TR1,
A current value is measured by detecting a voltage between both ends of the resistor, a transistor TR2 is operated based on the current value, and a current limit is realized by limiting a base current of the transistor TR1. As shown in this circuit, an excessive current can be limited by one transistor, so that the cost is very low and the size can be reduced.

According to the present embodiment, the input of the synchronization signal can be reliably performed, and the time of the program timer unit can be set to the same time as that of the program timer unit connected to the same signal line.

(Second Embodiment) A second embodiment of the program timer unit according to the present invention will be described below with reference to FIG. The same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In this program timer unit,
It has communication means for receiving an input from the outside, a simulation function for confirming the operation of the load device even before the control time, and a backlight unit A26 composed of LED light emitting elements as lighting means.

In the present embodiment, as shown in the flowchart of FIG. 10, the liquid crystal is turned off when a predetermined time has elapsed since the liquid crystal display was performed. This is to prevent the lifetime of the liquid crystal from being shortened if the liquid crystal is always displayed. Therefore, once the backlight unit A26 is turned on to perform the liquid crystal display (step SC1), and before the predetermined time elapses (step SC2), if the display is not necessary again (step SC3), the backlight unit A26 is turned on. The light unit A26 is turned off (step SC4).

Also, in the present embodiment, even if the current time does not coincide with the control time described in the control program, a simulation function capable of confirming whether the lighting device as the control terminal operates according to the program. Is provided. This is provided with an operation check switch A191 as an operation check means for operating the simulation function in the operation switch unit A19. When the operation check switch A191 is pressed, the operation set by the control program is actually performed by a switch operation from the panel. Since it can be executed, it is possible to immediately confirm whether or not to actually operate at the time of construction without waiting for the control time. Thus, if the timer does not operate as intended by the user, it may be a problem of the program timer unit itself or the signal line Ls
It is easy to determine if there is a problem on the side. Next, the simulation operation shown in the flowchart shown in FIG. 11 will be described. First, a simulation is started (step SB1). The microcomputer A10 acquires the current time data transmitted by the real-time clock A14 (step SB2), matches the current time data with the control time (step SB3), starts the control program, and executes the control contents (step SB4). ). In this way, the current time data is made to coincide with the operation time set in the control program so that the control program operates immediately, so that the operation of the control program can be confirmed immediately without waiting for the operation set time. it can. To confirm this, a control signal may be generated on the actual signal line Ls to operate the actual lighting device or the like. However, it is also checked whether or not this operation has actually been performed. You can check it at

Further, from the external information terminal, the memory A13
A serial port A15 is provided as an external communication means for rewriting the contents of the program, so that a control program created by a personal computer or the like can be written in the memory A13. Thus, even if the specifications of the control program or the like are changed, the control program can be easily changed on site. Also,
Even if there is a defect in the data of the control program or the like, the data can be changed in a state where the data is attached on site, so that the work is easy.

According to the present embodiment, the load device can be operated before the control time described in the control program has come, and the control program can be input from the outside, so that the user can easily use the program timer. Unit. (Third Embodiment) A third embodiment according to the present invention will be described. In this embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 12, in the present embodiment, when power is not supplied from the outside such as during a power failure, an internal power supply unit A24 for supplying current to the circuit is provided. And a voltage detection unit A25 for detecting the voltage of

If power is not supplied to the real-time clock A14, there is a possibility that the current time may be greatly deviated from an accurate external time. In view of this, a large-capacity capacitor CA is used as the internal power supply unit A24 to supply the minimum necessary power for the real-time clock A14 to perform timer counting. The power supply voltage normally operates at 5 volts, but during a power failure, the voltage is reduced to 2.5 volts to reduce the current consumption and at the same time sufficiently back up the real timer clock A14 even if the voltage of the large capacity capacitor drops. I can do it. Further, instead of using the large-capacity capacitor CA, a lithium battery or the like may be provided. Since a lithium battery has a much larger power supply capacity than a capacitor, timekeeping can be continued for a long time, and a deviation from an external time can be suppressed.

Further, a voltage detection unit A25 is provided for detecting whether the real-time clock A14 is continuously counting a timer by checking the voltage of the internal power supply unit A24. FIG. 13 shows a circuit diagram of the voltage detection unit A25.
The voltage detection unit A25 includes an operational amplifier OP, and detects the voltage of the large-capacity capacitor CA using the operational amplifier OP.
If this voltage decreases, it can be determined that the timer count unit has not counted the time. When power is supplied again in a state where the voltage is low, the timer count unit starts counting from an initial state that is significantly different from the current time.
For example, when only the data within the last one month is stored in the memory A13 in comparison with the current time data of the real-time clock A14, if the current time returns to the initial state, all data may be erased. become. Therefore, the year and month are written in the memory A13 at the beginning of each month, and when the large-capacity capacitor CA runs out and the timer count cannot be continued, the year / month data written in the memory A13 is used. It operates to avoid a large time shift.

According to the present embodiment, the timer count can be continued even when power is not supplied from the outside such as at the time of a power failure, and it is possible to keep the time from the external time. At the same time, the service life of the liquid crystal can be extended.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and can be implemented in various forms.

[0049]

As described above, in the program timer unit according to the first aspect of the present invention, the time is not shifted among the plurality of program timer units by synchronizing with the external time.

According to the second aspect of the present invention, it is possible to confirm whether or not the synchronization signal has been output from its own program timer unit. Therefore, it is possible to easily determine a problem due to a short circuit of the synchronization signal or the like. .

According to the second aspect of the present invention, it is possible to confirm whether or not the synchronization signal has been output from its own program timer unit. Therefore, it is possible to easily determine a problem due to a short circuit of the synchronization signal or the like. .

According to the third aspect of the present invention, it is possible to prevent an excessive current generated by a short circuit of the synchronization signal line from flowing to a circuit inside the program timer unit.

According to the fourth aspect of the present invention, it is possible to confirm whether or not a synchronization signal has been input from the outside. Therefore, it is possible to easily find a problem related to transmission of the synchronization signal due to a short circuit of the synchronization signal or the like. is there.

According to the fifth aspect of the present invention, since the backup power supply is provided, only the timing operation can be continuously performed even when the power is not supplied from the outside.

According to the sixth aspect of the present invention, since the detection unit for detecting the voltage of the backup power supply is provided, it is possible to confirm whether the timekeeping operation is continued using the backup power supply. is there.

According to the seventh aspect of the present invention, the display on the liquid crystal display is turned off after a predetermined time has elapsed, so that the period of use of the liquid crystal display can be extended, and the liquid crystal display is driven by the backup power supply. Sometimes, power consumption can be reduced.

According to the eighth aspect of the present invention, since the nonvolatile memory is used as the memory, the data stored in the memory is not erased even when power is not supplied.

According to the ninth aspect of the present invention, since external communication means for communicating with an external information processing terminal is provided, data can be externally input to the memory.

According to the tenth aspect of the present invention, since the control program can be forcibly operated even before the time set in the control program, the operation of the control program can be confirmed in advance. It is.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a program timer unit according to the present invention.

FIG. 2 is a diagram showing a remote monitoring control system using the program timer unit.

FIG. 3 is an explanatory diagram of a transmission signal of a program timer unit according to the present invention.

FIG. 4 is a diagram showing a liquid crystal display unit of the program timer unit.

FIG. 5 is a flowchart showing an input / output operation of a synchronization signal relating to the program timer unit.

FIG. 6 is a diagram showing the timing of a synchronization signal relating to the program timer unit.

FIG. 7 is a circuit diagram of a synchronization signal output unit of the program timer unit.

FIG. 8 is a circuit diagram of a synchronization signal input section of the program timer unit.

FIG. 9 is a diagram showing a second embodiment of the program timer unit according to the present invention.

FIG. 10 is a flowchart showing an on / off operation of a backlight unit of the program timer unit.

FIG. 11 is a flowchart illustrating a simulation operation of the program timer unit according to the second embodiment of the present invention.

FIG. 12 is a diagram showing a third embodiment of the program timer unit according to the present invention.

FIG. 13 is a circuit diagram of a voltage detector of the program timer unit.

FIG. 14 is a diagram showing a conventional remote monitoring and control system.

[Explanation of symbols]

 A1 Program timer unit A10 Microcomputer A11 Synchronization signal input section A12 Synchronization signal output section A13 Memory A14 Real-time clock A15 Serial port A17 Transmission signal transmission / reception section A18 Liquid crystal display section A19 Operation switch section A20 Synchronization signal detection section A22 Synchronization signal detection display section A23 Current Limiter A24 Internal power supply A25 Voltage detector A26 Backlight

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Koji Yokota, Inventor Koji Yokota, Mie Prefecture No. 856, Kadagiri, Noda, F-term in Ohms Co., Ltd. 5K048 AA06 BA07 DC04 EB02 EB04 EB05 EB11 FB15 FC01 FC03 HA01 HA02 HA23

Claims (10)

[Claims] An operation terminal and a control terminal each having an address set are connected to a transmission unit via a two-wire signal line, and data is transmitted and received by a time division multiplex transmission signal. By transmitting a transmission signal including address data to the signal line, the operation terminal and the control terminal are individually accessed, and during the signal return period set in synchronization with the transmission signal, the operation terminal having the monitoring input receives the signal. When the control data is received, the control data is generated based on the monitor data, and the control data is transmitted to the control terminal in which the correspondence between the operation terminal and the address that generated the monitor data is set in advance. Input means for inputting data including a load control time and control contents, which is used in a remote monitoring control system for controlling a load connected to the device,
Program creating means for creating a load control program based on the data input by the input means, storage means for storing the created control program, timing means for timing the current time, and a transmission unit via a signal line A transmission signal transmitting / receiving means for transmitting / receiving a transmission signal to / from, and monitoring data sequentially generated based on the current time data output from the timing means and the control program read from the storage means, and generated by the transmission signal transmitting / receiving means. And a timer control means for transmitting the monitored data to the signal line.
A program timer for a remote monitoring and control system, comprising: a synchronization signal input unit for receiving a synchronization signal for matching the current time with an external time; and a synchronization signal output unit for outputting the synchronization signal to the outside. unit. 2. The program timer unit according to claim 1, further comprising a synchronization signal detection unit that detects that the synchronization signal is output from the synchronization signal output unit. 3. The program timer unit according to claim 1, wherein the synchronization signal output unit includes a current limiting unit that limits a current equal to or greater than a predetermined current value. . 4. A liquid crystal display for displaying at least the current time and the like, and lighting means for lighting the liquid crystal display.
4. The remote monitoring control system according to claim 1, wherein the lighting unit turns on the liquid crystal display unit to display a current time or the like, and then turns off the light after a predetermined time has elapsed. Program timer unit. 5. The liquid crystal display section includes a synchronization signal detection display section that indicates detection of the synchronization signal, the synchronization signal input section includes the synchronization signal detection section, and the synchronization signal detection section includes the synchronization signal detection section. 5. The program timer unit of the remote monitoring control system according to claim 1, wherein when a signal is detected, the detection of the synchronization signal is displayed on the synchronization signal detection display unit. . 6. An operation terminal and a control terminal, each of which has an address set, are connected to a transmission unit via a two-wire signal line to transmit and receive data using a time division multiplexed transmission signal. By transmitting a transmission signal including address data to the signal line, the operation terminal and the control terminal are individually accessed, and during the signal return period set in synchronization with the transmission signal, the operation terminal having the monitoring input receives the signal. When the control data is received, the control data is generated based on the monitor data, and the control data is transmitted to the control terminal in which the correspondence between the operation terminal and the address that generated the monitor data is set in advance. Input means for inputting data including a load control time and control contents, which is used in a remote monitoring control system for controlling a load connected to the device,
Program creating means for creating a load control program based on the data input by the input means, storage means for storing the created control program, timing means for timing the current time, and a transmission unit via a signal line A transmission signal transmitting / receiving means for transmitting / receiving a transmission signal to / from, and monitoring data sequentially generated based on the current time data output from the timing means and the control program read from the storage means, and generated by the transmission signal transmitting / receiving means. And a timer control means for transmitting the monitored data to the signal line.In the program timer unit, an internal power supply unit for continuously clocking the current time by the clock means even in a state where power is not supplied from the outside. A program timer unit for a remote monitoring and control system, comprising: 7. A voltage detecting section for detecting whether or not the clock section can measure the current time by detecting a voltage of the internal power supply section.
2. The program timer unit according to 1. 8. The program timer unit according to claim 1, wherein said storage means comprises a nonvolatile memory. 9. An apparatus according to claim 1, further comprising external communication means for transmitting and receiving data to and from the outside, wherein said storage means is rewritable from outside via said communication input means. The program timer unit of the remote monitoring control system according to the above. 10. The program timer unit according to claim 1, wherein the input unit includes an operation check unit capable of forcibly operating the control program.