JPH0753347Y2 - Control system - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a control system such as a sequencer used in the field of factory automation.
An input / output device installed at a place distant from the control device body allows the operating state of the control device body to be recognized.

<Prior Art> Conventionally, a control device such as a sequencer has an input device and an output device, and controls the output signal according to the state of the input signal. In many cases, the operation is being stopped, and when the operation is stopped, the LED is turned off to indicate that the operation is stopped.

In addition, the input / output device may be installed in a place apart from the control device. In such a case, the control device main body and the input / output device are connected by a communication means, and the remote I / O on the control device side is connected.
Control function is executed by O function.

<Problems to be solved by the invention> By the way, an operator who conventionally performs adjustment work on the input / output device side, which is installed at a position distant from the control device body, can know the operating state of the control device body side. However, in order to check the operation of the control device main body, there is a problem that it is necessary to move to the place where the control device main body is installed and check the operation state.

The present invention aims to solve such a problem,
The purpose of the present invention is to reduce the burden on the operator by making it possible for the input / output device side to recognize the operating state of the control device body side having the remote I / O function.

<Means for Solving the Problems> In the present invention, which solves the above problems, a part of the input / output device is installed at a position distant from the control device main body for performing various control operations, and the control device main body is provided by communication means. In a control system for controlling an input / output device, a communication control unit which, on the input / output device side, determines whether or not the data transmitted from the control device main body is taken in and outputs a data recognition signal, A counter that is initialized by a data recognition signal and counts for a fixed time, and a monitor that monitors the operation of this counter and outputs an operation signal until the fixed time elapses and sends a stop signal when the fixed time elapses. A control system comprising: a signal generation unit; and a display unit that displays an operating state by the operating signal and displays a stopped state by the stop signal. .

<Operation> The control system of the present invention constantly monitors the data from the control device main body on the input / output device side, displays the operating state on the display unit when the data is to be taken in, does not send the data, and keeps the counter constant. When the time is counted, the operation stop of the control unit is displayed.

<Example> Hereinafter, the control system of the present invention will be described with reference to the drawings.

FIG. 1 is an overall block diagram of the control system of the present invention. In this figure, the control device body 10 and the input / output device 20 are installed at positions separated from each other via a communication cable C.

The control device body 10 stores a program for controlling a memory 11, a CPU 12 for controlling the execution of the program and the operation of the control device body 10, a data to be output to the input / output device 20 side, and the input / output device 20. The communication control device 13 which receives the data indicating the input state transmitted from the CPU 12 outputs the output corresponding to the output data generated by the CPU 12 to the I / O 30 which is coupled to the control device body 10, and the state of the I / O 30 at that time is transmitted to the CPU 12 The I / O control unit 14 for notifying the user, the LED drive unit 15 for displaying and driving the LED 40 indicating the state of the I / O 30 of the control device body 10, the power-on state and the program operation state, and the remote I / O for the input / output device 20 are provided. Have a function.

The input / output device 20 determines whether or not the data transmitted from the control device body 10 is data to be captured by itself, and transmits the data from the input / output device 20 side to the control device body 10 side. A control state monitoring circuit 22, which receives a signal for capturing data from the control unit 21 and generates an in-operation signal,
An I / O control unit 23, which outputs a signal corresponding to the data received from the communication control circuit 21 to the I / O 50 coupled to the input / output device 20,
The LED drive unit 24 is provided for controlling the LED 60 that displays the O50 state and the program operation state. The communication control unit 21 receives the information indicating the input state from the I / O control unit 23 and transmits the information to the control device body 10.

In the input / output device 20, the control state monitoring circuit 22 is the core block of the present invention, and its configuration and operation will be described below.

FIG. 2 is a block diagram of the control state monitoring circuit 22. The control state monitoring circuit 22 is composed of a counter 221 and a monitoring signal generating circuit 222.

When the communication control unit 21 receives the data DT from the control device body 10, it determines whether or not it is the data that should be received, and if it is the data DT that should be received, the data recognition signal ▲
▼ Send "L".

The counter 221 uses this data recognition signal ▲ ▼
Initialized by "L", supervisory signal generation circuit 222
Is reset by signal ▲ ▼ “L” and signal
Outputs SCAN “H”.

The counter 221 starts counting clock pulses CP immediately after initialization and reaches a certain set value (for example, 100 ms).
When it reaches, the trigger CK is applied to the supervisory signal generation circuit 222,
Set the signal SCAN to "L". However, if the signal ASSIGN “L” is given within this set value, the counter 221 is initialized before the trigger CK is generated.

That is, while the correct data DT is being sent from the control device body 10, the signal SCAN “H” is output, and the LED driving unit 24 is driven by this signal to turn on the LED 60. In such a state, normal operation on the control device body 10 side is indicated. When the operation is stopped, the signal SCAN becomes “L”, the LED driving unit 24 is driven, and the LED 60 is turned off.

FIG. 3 is a time chart showing the actual operation of the control state monitoring circuit 22 as described above.

The data DT1 sent from the control device body 10 is the input / output device 2
When the data is to be fetched at 0, the counter is generated by the data recognition signal ▲ ▼ “L” from the communication control unit 21.
221 starts operation, and the signal SCAN is sent from the supervisory signal generation circuit 222.
“H” is output and LED60 lights up. At this time, the normal operation display of the control device body 10 is displayed.

The same operation is performed when the data DT2 and DT3 are transmitted, but the counter 221 counts these data DT2 and DT3.
It has been received by the end 20 on the input / output device side within 100 ms of being up. The setting value 100 ms of the counter 221 is set in consideration of the data arrival interval in advance.

Then, when 100 ms has elapsed after the data DT3 was received and the next data is not received, the counter 221 counts
Up, the trigger signal CK is given to the supervisory signal generating circuit 222, and its output SCAN is set to "L". As a result, the LED 60 is turned off, and the operation of the control device body 10 is stopped.

In this way, the control system of the present invention can recognize the operating state and the operation stop state of the control device main body on the display unit such as the LED of the input / output device side which is located away from the control device main body. .

In the embodiment shown in FIG. 2, the counter 221 counts clock pulses of a constant cycle to realize a monitoring time of 100 ms. However, the present invention is not limited to this, and a means such as a mono-multivibrator may be used. Good, monitoring time is 100ms
Other than good. Further, although the operation status is displayed by LED, a liquid crystal display, a buzzer sound or the like may be used, and the operation signal and the stop signal may be transmitted to another device.

<Effect of Device> As described above, the control system of the present invention has the following effects.

Even when the control device main unit and the input / output device are set apart from each other, the operation status of the control device main body can be displayed on the input / output device side. The person does not have to bother to move to the place where the control device body is installed and recognize the operating state, and the burden on the operator can be reduced.

Further, since it is not necessary to incorporate the information that the vehicle is in operation into the data from the control device body, it is not necessary to lengthen the data to be transmitted and received.

Furthermore, since the control state monitoring circuit itself has a simple configuration,
Breakdown is unlikely.

[Brief description of drawings]

FIG. 1 is an overall block diagram of the control system of the present invention, and FIG.
FIG. 3 is a block diagram of the control state monitoring circuit in the control system of the present invention, and FIG. 3 is a time chart showing the operation of the control state monitoring circuit. 10 …… Control device main body, 11 …… Memory, 12 …… CPU, 13,21
...... Communication control unit, 14,23 ...... I / O control unit, 15,24 ...... LED drive unit, 20 …… I / O device, 30,50 …… I / O, 40,60 …… LE
D, C ... communication cable, 221 ... counter, 222 ... monitoring signal generation circuit.

Claims (1)

[Scope of utility model registration request] 1. A control system in which a part of an input / output device is installed at a position distant from a control device body for performing various control operations, and the control device body controls the input / output device by communication means. On the output device side, a communication control unit that determines whether or not the data transmitted from the control device body is taken in and outputs a data recognition signal, and a counter that is initialized by the data recognition signal and counts for a certain period of time The operation of the counter is monitored and a driving signal is output until the fixed time elapses, and a stop signal is output when the fixed time elapses, and an operating state is displayed by the driving signal. A control system comprising: a display unit that displays a stopped state according to the stop signal.