JPS622856Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a monitoring operation panel provided in a control center of a remote monitoring and control device, and particularly to a signal input/output device between indicator lights, switches, and a data processing section on the panel.

Since remote monitoring and control equipment centrally monitors and operates a large number of external devices, the monitoring operation panel is equipped with individual lamps and switches corresponding to the number of external devices, and the status of the corresponding devices is displayed on the lamp display. ,
Issues ON/OFF commands for the corresponding equipment by operating a switch.

FIG. 1 shows the combination of a conventional monitoring operation panel and a data processing section. The monitoring operation panel 1 is provided with selection switches #1 to #N in association with external devices, and each of #1 to #N is provided with at least one lamp _L1 , _L2 and at least one switch _S1 . Signal inputs and outputs of these lamps and switches are individually connected to an input/output device 2, and the input/output device 2 stores, holds, etc. the signals, and selects the signal exchange with the data processing section 3.

Therefore, the panel 1 and the input/output device 2 are lamps,
Since each switch is connected, the number of wires becomes enormous, and the number of wires within the panel also becomes enormous, requiring a great deal of effort to manufacture and test the panel 1 and the input/output device 2.

An object of the present invention is to provide a signal input/output device that can simplify wiring within a monitoring operation panel and simplify the input/output device.

FIG. 2 is a block diagram showing one embodiment of the present invention. Each selection switch #1 to #N is equipped with a control circuit _{C1 to CN} that performs input/output control as pulses obtained by dividing lamp and switch signals in time, and each control circuit and the input/output device 4 are common. The input and output signals between the two signal lines are also connected in a time-division manner, as shown in FIG. With this configuration, each of the selection switches #1 to #N is integrated with the control circuit, and the wiring inside the panel can be significantly reduced, and the noise resistance can be improved by reducing the number of wirings. Furthermore, the connection of the input/output device 4 on the panel side can be greatly simplified. In Fig. 2, #1 to #N are grouped with the same number of lamps and switches, but these do not have to be the same number; for example, #2 has only one lamp or switch. It may be only one.

Figure 4 shows selection switches #1 to 1 in Figure 2.
The signal transmission format between #N and the input/output device 2 is shown. The start signal for synchronization is distinguished from data by its pulse width, and following the start signal, time is allocated in the order corresponding to each selection switch #1 to #N, and from the start signal to #N.
One frame consists of signal divisions up to . #1~
The signals up to #N are composed of 4 bits, the first bit _PL1 is the lighting timing of lamp _L1 , and the second bit is
PL ₂ is the lighting timing of lamp L ₂ , 3rd bit
PL ₃ is the operation timing of switch S ₁ , the 4th bit
PL ₄ is set as the ON operation confirmation timing for switch S ₁ . From PL ₁ to PL ₃ , the lamp is turned on or off or the switch is turned on or off depending on the pulse width.
are distinguished, and PL ₄ can be switched depending on the pulse width, large or small.
Confirmation and non-confirmation of ON are distinguished, and if the state of the switch is different from confirmation, a signal with a wider pulse width is generated as a transmission error.

FIG. 5 shows an embodiment of the control circuit C shown in FIG. 2, in which connection with an input/output device is performed by a one-wire system. The control circuit indicated by the dash-dotted line block is connected to the common signal line 7 by the connection circuits 6 ₁ and 6 ₂ ,
The coupling circuit ₆₁ takes in data from the signal line 7, and the coupling circuit ₆₂ sends the data to the signal line.
The start signal of the data taken in from the coupling circuit ₆₁ (FIG. 4) is detected by the start detection circuit 8 and is used as a reset signal for the counter 9. Further, the pulses of each of the PL ₁ to PL ₄ bits of data #1 to #N are detected as a clock by a clock detector 10, and the clock is input to the counter 9 for counting. Further, long code (large pulse width) bits of the data are detected by a long code detector. “Counter 9 is
There is a carry from the lower two digits in the four pulse counts of PL ₁ to _{PL 4} , and the count value of the upper digits excluding the lower two digits can be associated with the selection switch numbers #1 to #N, so If the switch number to be assigned to the control circuit is set in the address setter 12, if the match detection circuit 13 detects a match between the count value of the counter 9 and the address setting value of the address setter 12, the switch number assigned to the control circuit will be set in the address setter 12. This can be obtained as the timing at which data PL ₁ to PL ₄ are taken into the lower two digits.
Then, the coincidence output of the coincidence circuit 13 is used as an input command to the distributor 14, so that the data of the control circuit is
Timing pulses of PL ₁ to PL ₄ (PL ₁ to PL 4 in Figure 4)
PL ₄ ) is obtained as the output of the distributor 14. Note that the set value of the address setter 12 is set to a value obtained by subtracting 1 from the address to be named to the control circuit, and the input command of the distributor 14 is obtained in advance when counting the data PL ₁ to _{PL 4} of the address. . The distributor 14 to which the input command is given decodes the lower two digits of the counter 9 and obtains timing outputs PL ₁ to PL ₄ . Of these, L ₁ and L ₂ are latch circuits 15 and 15, respectively.
16 clocks are input. Latch circuit 15,1
6 takes the data input as the output of the long code detector 11, and if there is a long code in PL ₁ , the data input "1" is stored in the latch circuit 15, and if there is a long code in PL ₂ , it is stored in the latch circuit 16. do. Latch circuit 15,1
The "1" output of 6 becomes a lighting signal for lamps L ₁ and L ₂ via coupling circuits 17 and 18. Therefore, signal line 7
Of the data shown in Figure 4 imported from , the data at the addresses designated as selection switches #1 to #N is extracted, and lamps L ₁ and L ₂ are turned on according to the data of PL ₁ and PLB ₂ . , control is performed to turn off the light.

The PL ₃ output of the distributor 14 is turned on when the switch S ₁ is turned on.
Since the OFF transmission timing is set, the ON/OFF state of the switch S1 is input to the AND gate 19, and the ON/OFF state of the switch _S1 is input to the other input of the AND gate 19.
0, and the state of switch _S1 is detected at the timing of _PL3 . The output is sent to the signal line 7 through the OR gate 21 and the coupling circuit ₆₂ .

Since the PL ₄ output of the distributor 14 is set at the timing of the switch S ₁ ON confirmation signal, the AND gate 2
2, and the output of the long code detector 11 and the OFF condition of switch S ₁ are input to the other inputs of AND gate 22, and the long code (confirmation signal of switch ON) is input even though switch S ₁ is OFF. A malfunction is detected when PL4 is given, and the timer circuit 23 is activated by the output "1" of the AND gate 22, and the long code signal following the long code of _PL4 is sent to the signal line 7.
Send to.

FIG. 6 shows data in the case of malfunction. The control circuit transmitted a switch OFF signal at PL ₃ timing, while the input/output device sent a switch ON confirmation signal at PL ₄ timing, and the timer circuit 23 sent a long code of PL ₄ . The signal with the long code PL ₄ following is transmitted. This allows the input/output device to determine that the switch ON command is incorrect.

FIG. 7 shows an embodiment of the input/output device 4, in which signals are exchanged with the signal line 7 via a coupling circuit 30, signals are exchanged with the data processing section 3 via a coupling circuit 31, and data is transferred. The CPU 32 performs error determination and data processing.

In the embodiment, in order to prevent lamp control malfunction, the latch circuits 15 and 16 may be set or reset by detecting the same control signal a plurality of times.

Furthermore, although a one-wire input/output system is shown in the embodiment, it can also be applied to a two-wire system in which the clock line is separate, or a three-wire system in which the start signal is separate from the line. In these cases, the control circuit consists of a clock detector,
There is no need for a start detector, and the data can be "1" or "0" instead of having a large or small width. Furthermore, the signal format is not limited to 4-bit units; for example, a determination signal for confirmation may be applied to the 5th bit. Further, when the selection switch is composed of only a lamp and only a switch, data control is performed using a 2-bit configuration or a 1-bit configuration.

As explained above, the signal input/output method according to the present invention has the advantage that the number of coupling lines between the monitoring operation panel and the data processing section can be significantly reduced, and manufacturing and testing thereof can be simplified. In addition, the selection switch has the functions of both indicator light control and switch status confirmation, and one selection switch #1 to #N can selectively control multiple switches and indicator lights to be controlled, respectively. The system can be configured by providing one type of selection switch for different control objects.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the signal input/output method of a conventional monitoring operation panel, Fig. 2 is a block diagram showing an embodiment of the present invention, and Figs. 3 and 4 show the signal transmission format in Fig. 2. FIG. 5 is a circuit diagram showing an embodiment of the control circuit in FIG.
FIG. 6 is a waveform diagram for explaining the operation of FIG. 5,
FIG. 7 is a block diagram showing an embodiment of the input/output device shown in FIG. 2. 1...Monitoring operation panel, 3...Data processing section,
4...Input/output device, #1, #N...Selection switch, _C1 , C _N ...Control circuit, ₆₁ , ₆₂ ...Coupling circuit, 7...Signal line, 8...Start detection circuit,
9... Counter, 10... Clock detector, 11...
...Long code detector, 12...Address setter, 13
... Matching circuit, 14 ... Distributor, 15, 16 ...
Latch circuit, 17, 18...coupling circuit, 19, 2
2...AND gate, 20...coupling circuit, 21...
...OR gate, 23...Timer circuit, 30, 31
...Combination circuit, 32...CPU.

Claims (1)

[Scope of utility model registration request] In a signal input/output device for transmitting and receiving signals between a monitoring operation panel including a large number of indicator lights and switches and a data processing unit for controlling the indicator lights and determining/confirming the operation status of the switches, the monitoring operation panel has a selection switch group in which the indicator lights and switches are distributed in correspondence with related external equipment, and each of the switch groups has an individual control circuit, and the input of the data processing section is controlled via the control circuit. It is connected to the output device through a common signal line, and the signal line receives pulse signals of varying widths from the data processing unit via the input/output device, including indicator light control bits and operation status determination/confirmation bits of switches. is associated with the selection switch group and outputted to each control circuit as a temporally divided pulse train signal including a common start signal for the pulse train, and the control circuit counts the number of pulses of the input pulse train signal as described above. a coincidence circuit that detects a match between a counter that is reset and started by a start signal and address data that sets the contents of the upper digits of this counter to each of the selection switch groups as the address of the selection switch group;
a distributor that captures and decodes the lower digit contents of the counter at the coincidence output timing of the coincidence circuit;
drive circuit means for obtaining a drive signal for the indicator lamp by reading the sign detection signal of the indicator lamp control bit pulse of the pulse train signal according to the pulse width within the data timing period of the selection switch obtained in the distributor; Within the data timing output period of the distributor, the state and confirmation signal of the switch operation state and confirmation control pulse timing of the bit pulse train signal is taken in from the switches in terms of pulse width and sent to the input/output device. A signal input/output device for a monitoring operation panel, characterized in that a control circuit is constituted by a drive circuit means, and the input signals of signals of indicator lights and switches are distinguished in time to control the corresponding indicator lights and switches. .