JPH03117197A - Multiplex selection detection system in remote monitor controller - Google Patents

Abstract

PURPOSE:To prevent mis-output due to multiplex selection by providing a selection output detection signal line between plural control output circuits in a slave station and allowing other control output circuit to monitor mutually the selection output state of one control output circuit. CONSTITUTION:A transmitter 4, a microcomputer 6 and a control output circuit 6 connect to a microcomputer input output common bus 9 of a slave station 2. A selection output detection signal line 10 is provided between the control output circuits 8. A selection output check circuit 23 is added in each control output circuit 6 and a selection end input 18 and the selection output detection signal line 10 are connected. The selection output check circuit 23 stores the presence of a selection output signal 22 of the selection output detection signal line 10 before the output of the selection output signal 22 at the leading of its own selection end input 19. The result is decided by the microcomputer 5 as the input data 18 to recognize whether or not multiple selection exists.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a selection control method for a remote monitoring and control device, and in particular, when there is at least one circuit outputting among a plurality of control output circuits, Other circuits relate to multiple selection detection schemes suitable for preventing multiple selections from occurring.

[Conventional technology]

As described in Japanese Patent Publication No. 63-52837, the conventional device monitors the reset of the selection completion signal, and when it is detected that the selection completion signal has been reset before the selection signal No. was supposed to reset the selection signal and control signal being transmitted, and after a predetermined period of time, perform the next selection control method. When the capacity of a slave station increases, a plurality of control output circuits must be connected, and it is also necessary to consider interlocking between these control output circuits.

[Problem to be solved by the invention]

In a remote monitoring and control device using a microcomputer, there is a problem in that multiple selections occur when a selection circuit of a control output circuit fails in a plurality of control output circuits on a common input/output bus of the microcomputer.

An object of the present invention is to prevent multiple selections among a plurality of control output circuits in a remote monitoring and control device using a microcomputer.

[Means to solve the problem]

The above purpose is to provide a selective output detection signal line between multiple control output circuits connected to the input/output common bus of the microcomputer in the slave station of the remote monitoring and control device, so that one control output circuit can output the selective output. This can be achieved by sending a signal indicating that the selection output is in progress to the selection output detection signal line 2 and mutually monitoring other control output circuits to prevent multiple selections.

A diagram of the principle of the present invention is shown in FIG. A transmission device 4 , a microcomputer 5 , and a control output circuit 6 are connected to the microcomputer input/output common bus 9 of the slave station 2 .

The control output circuit 6 is connected to a relay circuit 7 that controls each control device 8 . A selective output detection signal line 10 is added between the control output circuits 6. - A selection output check circuit 23 is added to the control output circuit 6, and the selection completion input 18 and the selection output detection signal line 10 are connected. The output of the selection output check circuit 23 is connected to the input data 19.

[Operation] When the transmission device 4 in the slave station 2 receives the selection signal 11 sent from the transmission device 3 of the master station 1, it reports it to the microcomputer 5 as received data 13. The microcomputer 5 confirms with the input data 19, which is the output of the selection output check circuit 23, that there is no other control output circuit 6 in the process of selective output for the corresponding control output circuits 6 from 71 to 71, and then controls the control output circuits 6. The output data 14 is sent to the output circuit 6.

The control output circuit 6 sends this signal to the relay circuit 7 as a selection code output 15 to output 1B. The operation results of the selections 1 to 45 performed in the relay circuit 7 are outputted from the relay circuit 7 to the control output circuit 6 as a selection completion input 18. The microcomputer 5 confirms the selection completion manual 18 with the input data from the control output circuit 6 ] 9 and sends it to the transmission device 4 as a transmission button 20 . The transmission device 4 sends a selection completion signal 21 to the master station 1.

The control output circuit 6 at the corresponding address sends out a raw selection output signal 22 to the selection output detection signal line 10 . Here, the selection output check circuit 23 checks the selection output raw signal 2 of the selection output detection signal line 1o before outputting the selection output raw signal 22.
By storing the presence or absence of 2 at the rising edge of its selection complete input 18, a single selection can be stored. By determining this result using the input data 19 in the microcomputer 5, it is possible to recognize whether multiple selections have been made.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

FIG. 2 shows a selective output check circuit in one embodiment. In the control output circuit 6 connected to the microcomputer input/output common bus 9, the selection output raw signal 22 of the selection output detection signal line 10 is connected to the D terminal of the DT flip-flop 24. Selection completion input 18 from relay circuit 7 is connected to inputs of inverter 29 and driver 30 via waveform shaping circuit 28 . The output of the inverter 29 is D
Connect to the T terminal of the T flip-flop 24.

The output of driver 30 is connected to select output raw signal 22 .

One output of the DT flip-flop 24 is the input data 19 of the microcomputer input/output common bus 9.
Connect to. The output data of the microcomputer input/output common bus 9 is connected to the selection circuit 26 and the input of the NAND gate 25. The output of selection circuit 26 is connected to the other input of NAND gate 25.

The output of NAND gate 25 is connected to the input of relay driver 27. The output of the relay driver 27 is connected to the relay circuit 7 as the selection coat output 15. The specific address of the output data 14 from the microcomputer 5 is decoded by the selection circuit 26 of the control output circuit 6.
NI) Open and close the gate of game 1-25. The control output circuit 6 corresponding to the specific address sends out a selection code output 15 to the relay circuit 7. The selection completion input 18 as a result of the operation of the selection code output 15 of the relay circuit 7 which received this signal becomes a trigger for the DT flip-flop 24 after chattering is removed by the waveform shaping circuit 28 . Here, if there is no selection output raw signal 22 from another control output circuit 6 on the selection output detection signal line 10, the output of the DT flip-flop 24 becomes 1. If there is a selection output raw signal 22 of another control output circuit 6, the DT flip-flop 2
The output of 4 becomes 0. This means that when the selection completion input 18 is outputted as the selection output raw signal 22 by the driver 30,
This can be achieved by making the operating speed of the driver 30 slower than the operating speed of the inverter 29.

In this way, the microcomputer 5 selects the output state of the DT flip-flop 24 as the result of multiple selection.
It can be used as in flowchart 1 shown in the figure.

〔Effect of the invention〕

According to the present invention, it is possible to control a controlled device while confirming that no other control output circuit is in the process of selectively outputting a plurality of control output circuits connected to a common bus of a microcomputer. Therefore, erroneous output due to multiple selection can be prevented.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of the present invention, FIG. 2 is a selection output check circuit diagram in one embodiment, and FIG. 3 is a device selection process performed on the control 7 output circuit by a microprocessor of a processing device in one embodiment. It is a flowchart. DESCRIPTION OF SYMBOLS 1... Master station, 2... Slave station, 3... Transmission device, 4... Transmission device, 5... Microcomputer, 6... Control output circuit, 7... Relay circuit, 8... Control equipment, 9... Microcomputer input/output common bus, 10... Signal line for selection output detection, 11 - Selection signal, 12 - Control signal,
13... Received data, 14... Output data, 15... Selection code output, 16... Control code output, 17. Equipment control output, 18... Selection completion input, 19... Input data, 20...・Transmission data, 21... selection completion signal,
22... Selection output raw signal, 23... Selection output check circuit, 24... DT flip-flop, 25 NA
ND gate, 26... Selection circuit, 27... Relay driver, 28... Waveform shaping circuit, 29... Inverter, 30.8 Funeral 2 Figure JP-A-3 117197 (4) Funeral diagram/9-Z TO 1×

Claims (1)

[Claims] 1. Remote monitoring in which the master station sends a selection signal to the slave station, receives a selection completion signal from the slave station to confirm selection completion, and then sends a control signal to the slave station. In a control device, a signal line for selective output detection is provided on a common bus of control output circuits in the slave station, and multiple selection is detected when a plurality of control output circuits are multiple selected. Multiple selection detection method in control equipment.