JPS6322515B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time division multiplex transmission type remote control and monitoring system that monitors various sensors and controls loads using dedicated two-core wires.

Figure 1 shows an overview of the conventional system.
A transmission signal as shown in FIG. 1B is cyclically sent from a base unit 1 to a plurality of terminal units 3 through a transmission line 2 made of a dedicated two-core wire. The transmission signal is composed of a start pulse S, an 8-bit address signal A, a 5-bit control signal C, and a long pulse R for waiting for a return signal of several bits, and accesses a plurality of terminals 3 in sequence. When the above address data matches its own address, the terminal device reads the control data and controls a predetermined load according to the contents, or returns the monitoring status of a predetermined sensor to the base device 1. The return signal is transmitted to the base unit in current mode by short-circuiting two dedicated lines at predetermined timing during a long pulse period.

Figure 2 shows a complex system that is the object of the present invention.
B is a lower-level system that is inferior in scale and functionality, and C is a coupling interface. The lower-level system is, for example, a centralized control system for each building in a factory.
The upper system is the central system for the entire factory.
An object of the present invention is to provide a connection means that can organically combine the functions of the upper and lower systems and make use of both the advantages of the individual systems and the advantages of the central system.

The present invention will be explained in detail below with reference to embodiment figures. As shown in FIG. 3, the remote control monitoring system according to the present invention sequentially transmits address data A, control data C, and reply standby pulse R from a master device 1 to a plurality of terminal devices 3 through a transmission line 2 by time division multiplexing. Sends a pulse signal, detects that the address data matches its own address in each terminal 3, reads the control data, controls a predetermined load, and monitors various sensors during the reply waiting pulse period. A plurality of individual system units configured to send data back to the base unit 1 are installed together, and a central system unit with a similar configuration is installed, and one terminal unit 4 of each individual system unit is used for connection and its control output 5 is provided. and monitoring input 6 are connected to the bus line 8 of the microprocessor 7 provided in the master unit 1 of the central system, and a flip-flop 10 is connected to each coupling terminal 4 by the address match detection signal 9. An output 13 of each flip-flop 10 is provided.
and a change check signal output 11 that changes only when the control output 5 of each coupling terminal 4 changes, are connected to the above bus line, and each coupling terminal is sequentially accessed in the master unit 1 of the central system. The reset signal 12 is sent to the flip-flop 10 only when the output of the flip-flop 10 is changing, and the change check signal output 11 is read, and the control output 5 is read only when the change check signal output 11 is changing. It is. 14 is a latch, and 15 is a 3-state buffer.

Next, the operation of the remote control monitoring system of the present invention will be explained. In FIG. 3, a transmission signal is cyclically sent from each base unit 1 of the individual system row to each terminal unit 3 belonging to it, and therefore the coupling terminal unit 4 is also transmitted from the base unit 1 of each individual system row. accessed periodically. The flip-flop 10 is set each time the coupling terminal 4 is accessed, but the control output 5 does not change if the control signal following the address signal does not contain predetermined information such as the occurrence of a fire.

The microprocessor 7 of the central system 1 sequentially accesses each coupling terminal 4 using an address set separately from the address assigned to each coupling terminal 4 in the individual system 2. As shown in the figure, the flip-flop of the coupling terminal #1 is checked, and if there is no change, the process immediately moves on to checking the flip-flop of the coupling terminal #2. If there is a change in the output of the flip-flop, a reset signal is sent to the flip-flop and the bit of the change check signal is read, and if the change check bit is inverted, the data of the control output is read. If the check bit has not changed, the next terminal is accessed immediately.

With the above configuration, the processing time required for reading data from individual systems in the central system can be significantly reduced. That is,
Since the individual systems operate asynchronously with each other and the number of terminals connected to each individual system is different, the polling period also varies, but by scanning only each flip-flop at high speed with a microprocessor, , it is possible to access the connected terminal devices that have been polled in an orderly manner, and it also eliminates the waste of reading control data that does not change and comparing it with the previous data, and instead reads only the control data that has changed, resulting in high-speed processing. Moreover, even in individual systems, it is possible to eliminate the waste of sending the same data over and over again until the central system receives the data.

[Brief explanation of the drawing]

Fig. 1a is a block diagram of a conventional remote control monitoring system, b is an explanatory diagram of the same operation as above, Fig. 2 is a schematic block diagram of the system of the present invention, Fig. 3 is a detailed block diagram of main parts of the system of the present invention, FIG. 4 is an explanatory diagram of the same operation. 1 is a base unit, 2 is a transmission line, 3 is a terminal device, 4 is a coupling terminal device, 5 is a control output, 6 is a monitoring input, 7 is a microprocessor, 8 is a bus line, 9 is an address match detection signal, 10 is a flip-flop, 11
12 is a check signal output, 12 is a reset signal, A is a central system, B is an individual system, A is an address data signal, C is a control data signal, and R is a long pulse for waiting for a reply.

Claims (1)

[Claims] 1 Send a time-division multiplex transmission pulse signal containing address data, control data, and a reply waiting pulse from the base device to multiple terminal devices sequentially through the transmission line,
Each terminal device detects that the above address data matches its own address, reads the above control data, controls a predetermined load, and returns the monitoring data of various sensors to the base device during the above reply standby pulse period. A plurality of individual systems configured as shown above are installed together, and a central system with a similar configuration is installed, and one terminal device of each individual system is used for coupling, and its control output and monitoring input are connected to a microcontroller installed in the main unit of the central system. A flip-flop is connected to the bus line of the processor and is set in each coupling terminal by an address match detection signal, and changes only when the output of each flip-flop and the control output of each coupling terminal change. The change check signal output is connected to the above bus line, and the master unit of the central system sequentially accesses each coupling terminal, and only when the output of the flip-flop is changing, sends a reset signal to the flip-flop and outputs the change check signal. A remote control monitoring system characterized in that the output is read and the control output is read only when the change check signal output is changing.