JPH09120305A - Process control operation monitor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm the operation of process equipment through simple constitution without increasing the number of cables. SOLUTION: A 1st photocoupler 37 is driven with the operation signal of the processing equipment 2 corresponding to an operation command from a console panel, an output relay 38 is energized in response, and an electromagnetic contactor 14 of a power control board 32 is driven through the operation of the relay contact 39 to feed electricity to the main circuit 16 of the process equipment 2. At this time, a 2nd photocoupler 41 detects whether or not there is a current flowing between the electromagnetic contactor 14 and relay contact 39 as a result of the opening/closing operation of the relay contact 39 and inputs the detection result as a state detection status signal to a process controller basic part 32, which detects the processing equipment 2 not operating at its operation time according to the state detection status and input operation signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls on / off of incidental equipment such as lighting, floor drainage pump, ventilation fan, etc. by operating a switch on an operation panel by an operator.
In addition, the present invention relates to a process control operation monitoring device that confirms whether these auxiliary devices are turned on or off.

[0002]

2. Description of the Related Art Generally, a process control device for turning on / off a process device such as a lighting device or a ventilation fan is operated by an operator, which outputs an operation command to the process device, for example, an operation panel provided with an operation switch of the process device. An input command and a cut command are input, and this operation command is processed by a control circuit with the start condition and operating condition of the process equipment as a condition, and the input / off control output of the process equipment is processed through the process input / output circuit. It outputs to the power control panel that houses the machinery of the equipment and the load switch, and turns on / off (runs / stops) the process equipment.

The control circuit has a function created by a software program (such as a ladder circuit) which is conditioned on the starting conditions and operating conditions of the process equipment. FIG. 4 is a block diagram of a process control operation monitoring device applied to such a process control device.

The operation panel 1 is provided with an on / off switch 3 for the process equipment 2 such as a lighting device or a ventilation fan, and a display lamp 4 for confirming the on / off operation of the process equipment 2.

The operation panel 1 includes a process control device 5
Connected to the process input / output device 6. The process control device 5 has the functions of the process input / output device 6 and the process control device basic unit 7.

The process control device basic unit 7 is a control computer including a memory, an arithmetic and control unit, etc., like a general programmable controller, and is a signal input from the process input / output unit 6, that is, the process equipment 2. A function to perform signal processing by a software program created in the memory based on the ON / OFF command and send a signal as a result of the processing, that is, an input operation output to the power control panel 8 through the process input / output device 6. Have

The process input / output device 6 specifically includes an output substrate 6a and an input substrate 6b as shown in FIG. The output board 6 a and the input board 6 b are connected to the process control device basic section 7 via the input / output bus 9.

Of these, the output substrate 6a has a plurality of photocouplers 11 connected to the drive unit 10, and an output relay 12 connected to the phototransistors of the photocouplers 11. The contact 13 of the output relay 12 is connected to a cable 15 connected to the electromagnetic contactor 14 of the power control panel 8.

The power control board 8 accommodates the electromagnetic contactor 14, and the electromagnetic contactor 14 is turned on / off in response to an input operation signal coming from the output board 6a through the cable 15.

The electromagnetic contactor 14 is an opening / closing contact 14 connected to a main circuit 16 of the process equipment 2 such as a lighting device or a ventilation fan.
a and a contact 14b for detecting an operating state. An interlock 17 is connected to the cable 15. The interlock 17 operates when an abnormal signal is output, and cuts off the power supply to the electromagnetic contactor 14 to turn it off.

On the other hand, the contact 14b for detecting the operating condition is connected to the input board 6b via the cable 15. The input board 6b includes a plurality of photo couplers 19 in the input section 18.
The photodiode of the photocoupler 19 is connected to the cable 20 to which the contact 14b from the power control panel 8 is connected.

With such a configuration, when the on / off switch 3 is operated and, for example, an input command for the process equipment 2 is input to the process input / output device 6, the input command is input from the process input / output device 6. The process control device basic unit 7 is entered.

The process control device basic section 7 performs signal processing by a software program created in the memory based on an input command of the process equipment 2 input from the process input / output device 6, and the processing result. Is sent to the drive unit 10.

The drive unit 10 includes a corresponding photo coupler 11 among a plurality of photo couplers 11 according to an input operation signal.
Drive. The drive of this photocoupler 11 energizes the output relay 12 and closes its contact 13. As a result, the input operation signal is amplified and output by the relay and transmitted to the electromagnetic contactor 14 of the power control panel 8.

However, the electromagnetic contactor 14 is turned on to close the opening / closing contact 14a, and the process equipment 2 is energized through the main circuit 16. At the same time, the contact 14b of the electromagnetic contactor 14 is closed, and an operation signal due to the closing of the contact 14b is sent to the input board 6b of the process input / output device 6 through the cable 20.

This operation signal is input to the input unit 18 via the photo coupler 19 and sent to the process control device basic unit 7 through the internal bus 9. The process control device basic unit 7 confirms that the operation is normal when the process equipment 2 is operated by the operation signal being returned in response to the issuing of the input command, and the process display device inputs the input command. It is sent to the display lamp 4 of the operation panel 1 through the output device 6 and is turned on.

Here, the software program function of the process control device basic section 7 has the structure shown in FIG. An input command is input to one input terminal of the OR gate 20, and the output terminal of the OR gate 20 is connected to one input terminal of the AND gate 21. The output terminal of the AND gate 21 has an OR gate 2 for self-holding.
0 is connected to the other input terminal.

A cut command is input to one input terminal of the OR gate 22, and the output terminal of the OR gate 22 is connected to the other input terminal of the AND gate 21 via the NOT gate 23.

The AND gate 21 outputs an input operation signal to the power control panel 8 and an input display command to the display lamp 4. On the other hand, the operation signal from the contact 14 b of the electromagnetic contactor 14 is input to one input terminal of the AND gate 25 via the knot gate 24. The output terminal of the AND gate 21 is connected to the other input terminal of the AND gate 25.

The output terminal of the AND gate 21 is connected to the set circuit 27 via the timer 26. The output of the set circuit 27 becomes an abnormal signal. The output terminal of the set circuit 27 is connected to the other input terminal of the OR gate 22.

The set circuit 27 includes a reset circuit 2
8 is connected and the reset operation is performed by operating the failure recovery switch 29. The failure recovery switch 29 is arranged on the operation panel 1.

The operation of the basic part 7 of the process control device will be described. When the ON command is turned on by operating the ON / OFF switch 3, the ON command passes from the OR gate 20 to the AND gate 21 and receives the ON operation signal. Is sent to the process input / output device 6. When the input operation signal is turned on, the input operation signal returns to the OR gate 20, so that the output of the input operation signal is self-held.

At this time, if the turn-off command is turned on or the abnormal signal is turned on as the starting condition, the input command cannot pass through the AND gate 21, and the input operation signal is sent to the process input / output device 6. Not done.

When the input operation signal is sent to the power control board 8 and the electromagnetic contactor 14 is turned on, the contact 14b is closed and the operation signal is turned on as described above. This operation signal is sent to the AND gate 25 through the knot gate 24. An ON operation signal is input to the AND gate 25, but an OFF operation signal that has passed through the NOT gate 24 is input.
The output of 5 is turned off.

Therefore, the timer 26 does not operate, the set circuit 27 does not operate accordingly, and the abnormal signal is not turned on. However, the electromagnetic contactor 14 is turned on in spite of the input operation signal sent from the process control device basic unit 7 due to a device failure such as a disconnection of the cable 15, a failure of the electromagnetic contactor 14, or an overload. Not contact point 14b
May not close.

In such a case, the operation signal is turned off and is input from the NOT gate 24 to the AND gate 25, so that the timer 26 operates and an ON signal is sent to the set circuit 27 after a predetermined time has elapsed.

As a result, an abnormal signal is output from the set circuit 27, the abnormality is displayed on the operation panel 1, and the operator is notified. However, in the above-mentioned monitoring device, the operation confirmation of the process equipment 2 is returned to the input board 6b through the cable 20 as the operation signal of the contact signal of the contact 14b of the electromagnetic contactor 14, and the process control device basic unit 7 issues an on / off command. Also, since the confirmation operation is performed based on the operation signal, the cable 2 for each process device 2
0 must be connected.

Therefore, for example, in a building, 10
Since the process devices 2 ranging from 00 to 2000 points are provided, additional cables 20 may be added to check the operation of these process devices 2, and the entire system becomes complicated and there are many defect factors. It was unreliable.

[0029]

As described above, the cable 20 must be additionally installed to confirm the operation of a large number of process equipments 2, and the entire system is used to perform the non-operation monitoring function for the process equipments 2. Is a complicated configuration.
Therefore, it is an object of the present invention to provide a process control operation monitoring device which has a simple configuration and is capable of checking the operation of process equipment without increasing the number of cables.

[0030]

According to the first aspect of the present invention, the operation command from the operation panel is amplified as an operation signal of the process equipment via the relay and output to the power control panel for operating / stopping the process equipment. In the process control operation monitoring device having the function of confirming the operation when the process equipment is operated according to the operation signal, the state detection means for detecting the energization state to the power control panel by the relay and the detection by the state detection means A process control operation monitoring device including: a monitoring unit that detects an operation abnormality during operation of a process device based on the supplied energization state and an input operation signal.

According to the first aspect, when an operation command is input from the operation panel, the operation command is amplified as an operation signal of the process equipment via the relay and output to the power control panel, thereby the process equipment. Start / stop of.

At this time, the energization state of the power control panel by the relay is directly detected by the state detection means, and the monitoring means is based on the detected energization state and the operation signal.
Check the operation abnormality of the process equipment, that is, the operation of the process equipment.

As a result, the energization state of the power control panel by the relay can be directly detected without passing a separate cable, and the operation of the process equipment can be confirmed with a simple configuration without increasing the number of cables. .

According to the second aspect, the operation command from the operation panel is input, the operation signal of the process equipment is generated in accordance with the operation command, and the first photocoupler is driven.
In response to the operation of the relay contact when the relay is energized in response to the photo coupler of, the electromagnetic contactor in the power control panel that opens and closes the main circuit of the process equipment is driven, and in response to the operation command from the operation panel. In a process control operation monitoring device having a function of confirming the operation of the process equipment, a second photocoupler for detecting the presence / absence of a current flowing between the electromagnetic contactor and the relay contact when the relay contact is opened / closed, Process control provided with a monitoring means for inputting the detection result of the second photocoupler as a state detection status signal and detecting a non-operation during the operation of the process equipment based on the state detection status and the input operation signal. It is an operation monitoring device.

According to the second aspect, when the operation command is input from the operation panel, the input operation signal of the process equipment corresponding to the operation command is generated to drive the first photo coupler. The relay is energized in response to the driving of the first photocoupler, and the electromagnetic contactor in the power control panel is driven in response to the operation of the relay contact. By driving this electromagnetic contactor, the main circuit of the process equipment opens and closes, and the process equipment is energized.

At this time, the presence or absence of a current flowing between the electromagnetic contactor and the relay contact when the relay contact is opened and closed is detected by the second photocoupler, and the detection result is used as a state detection status signal in the monitoring means. The monitoring means detects the non-operation during the operation of the process equipment based on the status detection status and the operation signal.
As a result, the current-carrying state of the electromagnetic contactor can be directly detected without passing a separate cable, and the operation of the process equipment can be confirmed with a simple configuration without increasing the number of cables.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The same parts as those in FIGS. 4 to 6 are designated by the same reference numerals. FIG. 1 is a block diagram of a process control operation monitoring device applied to a process control device.

The operation panel 1 is connected to the process input / output device 31 of the process control device 30. The process control device 30 has the functions of the process input / output device 31 and the process control device basic unit 32.

The process control device basic unit 32 is a control computer composed of a memory, an arithmetic and control unit, etc., like a general programmable controller, and is a signal input from the process input / output unit 31, that is, the process equipment 2. Based on the ON / OFF command, the signal processing is performed by the software program created in the memory,
It has a function of sending a signal as a result of the processing, that is, an input operation output to the power control panel 33 through the process input / output device 31.

The process input / output device 31 specifically includes a digital output board 34 as shown in FIG. The digital output board 34 is connected to the process control device basic section 32 via the input / output bus 9.

The digital output board 34 is used in the drive unit 3
5, a plurality of insulating first photocouplers 37 are connected to the drive unit 35, and an output relay 38 is connected to a phototransistor of the first photocoupler 37.

This output relay 38 is for amplifying the capacity of the signal for driving the first photocoupler 37 because it has no current capacity for directly driving the process equipment 2, and its contact 39 is for the power control board. It is connected on a cable 40 which connects to the electromagnetic contactor 14 at 33.

Further, the cable 40 is extended and connected to a bidirectional second photocoupler 41 which is connected to the input section 36 and serves as a state monitoring means. Therefore, the presence or absence of the current flowing between the electromagnetic contactor 14 and the contact 39 of the relay, that is, the current flowing in the cable 40 is detected by the second photocoupler 41, and the detection result is input from the input unit 36 as a state detection status signal. It is adapted to be sent to the process control device basic unit 32 through the output bus 9.

The software program function of the process control device basic section 32 has a function as a monitoring means and has a structure shown in FIG. An input command is input to one input terminal of the OR gate 20, and this OR gate 2
The output terminal of 0 is connected to one input terminal of the AND gate 21. The output terminal of the AND gate 21 is connected to the other input terminal of the OR gate 20 for self-holding.

A cut command is input to one input terminal of the OR gate 22, and the output terminal of the OR gate 22 is connected to the other input terminal of the AND gate 21 via the NOT gate 23.

The AND gate 21 outputs an input operation signal to the power control panel 33 and an input display command to the display lamp 4. On the other hand, the status detection status signal input through the cable 40 is input to one input terminal of the AND gate 25 via the knot gate 24. The output terminal of the AND gate 21 is connected to the other input terminal of the AND gate 25.

The output terminal of the AND gate 21 is connected to the set circuit 27 via the timer 26. The output of the set circuit 27 becomes an abnormal signal. The output terminal of the set circuit 27 is connected to the other input terminal of the OR gate 22.

The set circuit 27 includes a reset circuit 2
8 is connected and the reset operation is performed by operating the failure recovery switch 29. The failure recovery switch 29 is arranged on the operation panel 1.

The power control board 33 accommodates the electromagnetic contactor 14, and the electromagnetic contactor 14 is turned on / off in response to an input operation signal coming from the digital output board 34 through the cable 40.

This electromagnetic contactor 14 is an opening / closing contact 14 connected to a main circuit 16 of the process equipment 2 such as a lighting device or a ventilation fan.
a. Next, the operation of the apparatus configured as described above will be described.

When the on / off switch 3 is operated and, for example, an input command for the process equipment 2 is input to the process input / output device 31, this input command is input from the process input / output device 31 to the process control device basic section 32. .

The process control device basic section 32 performs signal processing by a software program created in the memory on the basis of an input command of the process equipment 2 input from the process input / output device 31, and the processing result. Is input to the drive unit 35 of the process input / output device 31.

The drive section 35 reads the data of the input operation signal of the address + data line of the input / output bus 9 and drives the corresponding photo coupler 37 among the plurality of photo couplers 37 as individual bit signals.

By driving the photocoupler 37, the output relay 38 is energized, and its contact 39 is closed. As a result, the input operation signal is capacity-amplified by the output relay 38,
It is transmitted to the electromagnetic contactor 14 of the power control board 33.

However, the electromagnetic contactor 14 is turned on to close the opening / closing contact 14a, and the process equipment 2 is energized through the main circuit 16. At this time, the relay contact 39 is closed and the electromagnetic contactor 14 is turned on, so that the cable 4
A current flows through 0, which causes the second photocoupler 41.
Is turned on.

The ON state of the second photo coupler 41 is
The status detection status signal is sent from the input section 36 to the process control device basic section 32 through the input / output bus 9.
The process control device basic unit 32 confirms that the operation is normal during the operation of the process equipment 2 by sending back the state detection status signal in response to the issue of the incoming command, and issues the incoming display command. It is sent to the display lamp 4 of the operation panel 1 through the process input / output device 31 and is turned on.

The operation of the process control device basic section 32 will now be described. When the ON command is turned on by the operation of the ON / OFF switch 3, the ON command passes from the OR gate 20 to the AND gate 21 and receives the ON operation signal. Is sent to the process input / output device 6. When the input operation signal is turned on, the input operation signal returns to the OR gate 20, so that the output of the input operation signal is self-held.

At this time, if the turn-off command is turned on or the abnormal signal is turned on as the starting condition, the input command cannot pass through the AND gate 21, and the input operation signal is sent to the process input / output device 31. Not done.

When the input operation signal is thus sent to the power control board 33 and the electromagnetic contactor 14 is turned on, the contact 14b is closed and the state detection status signal is turned on as described above.

This status detection status signal is sent to the AND gate 25 through the NOT gate 24. Although an ON input operation signal is input to the AND gate 25, an OFF operation signal that has passed through the NOT gate 24 is input, so that the output of the AND gate 25 is OFF from this time.

Therefore, the timer 26 does not operate, the set circuit 27 does not operate accordingly, and the abnormal signal is not turned on. However, despite the fact that the process control device basic unit 32 sends the input operation signal of the input command due to a device failure such as disconnection of the cable 40, failure of the electromagnetic contactor 14, or overload, the electromagnetic contactor 14 is It may not turn on.

In such a case, the state detection status signal is turned off and is input from the NOT gate 24 to the AND gate 25, so that the timer 26 operates and an ON signal is sent to the set circuit 27 after a lapse of a certain time.

As a result, an abnormal signal is output from the set circuit 27, the abnormal display is displayed on the operation panel 1, and the operator is notified. As described above, in the first embodiment, the current flowing between the electromagnetic contactor 14 and the relay contact 39 when the relay contact 39 is opened and closed,
That is, the current flowing through the cable 40 is detected, and the non-operation during the operation of the process equipment 2 is detected based on the input operation signal as the status detection status. Therefore, the electromagnetic contactor 14 is not passed through the cable separately. The current flowing between the relay contact 39 and the relay contact 39 can be directly detected, whereby the number of cables between the process control device 30 and the power control panel 33 can be reduced, and the number of cables can be increased with a minimum device configuration and a simple configuration. The operation of the process equipment 2 can be confirmed without doing so.

Further, since the non-operation confirmation of the process equipment 2 is performed by receiving the status detection status signal corresponding to the operation of the output relay 38, it is impossible in the prior art in which the operation signal is assigned to each process equipment 2. It is possible to standardize the software functions that were previously described, and it is possible to supply the software abnormality detection circuit in ROM.

As a result of checking the operation of the process equipment 2, if the status detection status signal is in the off state, it can be judged as abnormal. In such a situation, (a) the output relay 38 of the digital output board 34 Malfunction (including power failure) (b) Malfunction of logic circuit of digital output board 34 (including power failure) (c) Failure of cable 40 connecting output relay 38 and power control board 33 (d) The power supply to the power control board 33 is cut off due to a power trip of the power control board 33. (e) The electromagnetic contactor 14 is defective (f) The interlock 17 is in operation, and the input operation command (the output relay 38 is turned on) is a process device. You can see the situation that does not affect 2.

[0066]

As described above in detail, according to the first and second aspects of the present invention, it is possible to provide the process control operation monitoring device which can confirm the operation of the process equipment with a simple structure without increasing the number of cables.

According to claims 1 and 2 of the present invention, the situation can be confirmed when the operation of the process equipment can be confirmed with a simple structure without increasing the number of cables and the operation of the process equipment becomes abnormal. It is possible to provide a process control operation monitoring device capable of easily confirming

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a process control operation monitoring device according to the present invention.

FIG. 2 is a specific configuration diagram of the device.

FIG. 3 is a configuration diagram showing a software program function of a process control device basic unit in the device.

FIG. 4 is a configuration diagram of a conventional process control operation monitoring device.

FIG. 5 is a specific configuration diagram of the device.

FIG. 6 is a configuration diagram showing a software program function of a process control device basic unit in the device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Operation panel, 2 ... Process equipment, 3 ... ON / OFF switch, 4 ... Indicator lamp, 14 ... Electromagnetic contactor, 30 ... Process control device, 31 ... Process input / output device, 32 ... Process control device basic part, 33 ... power control board, 34 ... digital output board, 35 ... drive section, 36 ... input section, 37 ... first
Photo coupler, 38 ... Output relay, 39 ... Contact, 40 ...
Cable 41. Second photo coupler.

Claims (2)

[Claims] 1. An operation command from an operation panel is amplified as an operation signal of a process device via a relay and output to a power control panel for operating / stopping the process device, and the process according to the operation signal. In a process control operation monitoring device having a function of confirming an operation at the time of operating an equipment, a state detection means for detecting an energization state of the power control panel by the relay, and an energization state and a front state detected by the state detection means. A process control operation monitoring device, comprising: a monitoring unit that detects an operation abnormality during operation of the process equipment based on a writing operation signal. 2. An operation command from an operation panel is input, an operation signal of process equipment is generated in accordance with the operation command to drive a first photocoupler, and a relay is attached in response to the first photocoupler. In response to the operation of the relay contact when energized, the electromagnetic contactor in the power control panel that opens and closes the main circuit of the process equipment is driven, and the operation in the process equipment according to the operation command from the operation panel. In a process control operation monitoring device having a function of confirming, a second photocoupler for detecting the presence or absence of a current flowing between the electromagnetic contactor and the relay contact when the relay contact is opened and closed, The detection result of the second photo coupler is input as a status detection status signal, and when the process equipment is operated based on the status detection status and the input operation signal. Definitive process control operation monitoring device comprising monitoring means for detecting a non-operation, by comprising a.