JPS6126103A - Discriminating device of control operation - Google Patents

Abstract

PURPOSE:To improve the safeness of a control part by generating a similated abnormal status without interfering the operation of a plant or the like during its normal operation and discriminating whether processing operation for the abnormal status is precisely executed or not. CONSTITUTION:If a make contact 39 is closed when a circuit operates normally and valves 1, 3 are in the normal operation status, a simultated abnormal operation testing circuit 31 is actuated to form simulated abnormal status. When an abnormal case working relay 7 is actuated, a normal operation starting relay 5 is turned off at first in accordance with the opening of a brake contact 7-1, a normal operation starting auxiliary relay 9 is turned off in accordance with the opening of a make contact 5-2 and then an abnormal case operation auxiliary relay 11 is actuated in accordance with the closing of a make contact 7-2. Consequently, the generation of abnormality is set up, an operation discriminating relay 37 is actuated through a brake contact 5-3, a make contact 7-3, a brake contact 9-2, and a make contact 11-2 and the normality of the processing operation for the abnormal status is checked on the basis of said working operation.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to the normality of the operation of a control section consisting of a sequence circuit, a switching circuit, etc. that controls a controlled section of a plant, etc., especially when an abnormal state occurs. The present invention relates to a control operation determination device that determines the normality of the operation of a control unit.

[Prior Art] For example, a relay control circuit for controlling a plant or the like is composed of various relays to operate the plant in a predetermined order. FIG. 2 shows an example of such a rage detection circuit. This relay sequence circuit controls the first valve 1 and the second valve 3 constituting the plant to operate in a predetermined manner, and includes a normal operation start relay 5, an abnormal operation relay 7, It has a normal operation starting auxiliary relay 9 and an abnormal operation starting auxiliary relay 11.

The normal operation start relay 5 has one end connected to the normally closed contact of the abnormal operation relay 7, that is, the break contact 7-1, the break contact 15 of the operation stop command switch, and the normally closed contact or make contact 17 of the operation command switch. It is connected to a first power line 19 on the positive polarity side of the power source, for example, and the other end is connected to a second power line 21 on the negative polarity side of the power source, for example. In addition, the make contact 5 of the normal operation start relay 5 is connected in parallel to the make contact 17 of the operation command switch.
-1 is connected. The abnormal operation relay 7 has one end connected to the first power line 19 via the make contact 23 of the abnormal operation switch, and the other end connected to the second power line 21.
It is connected to the. The abnormal operation switch is a switch installed in a device (not shown) such as an alarm device, for example.The normal operation start auxiliary relay 9 has one end connected to the first The abnormal operation auxiliary relay 11 has one end connected to the first power line 19 of the abnormal operation relay 7 via the meter contact 7-2 of the abnormal operation relay 7. It is connected to the power supply line 19, and the other end is connected to the second power supply line 21. Further, other contacts are connected in parallel to the make contact 5-2 and the meter contact 7-2.

The first valve 1 and the second valve 3 each have one end connected to the first control line 25 via the meter contact 9-1 of the normal operation starting auxiliary relay 9 and the make contact 11-1 of the abnormal operation auxiliary relay 11. and the other ends are both connected to the second control line 27. The second valve 3 must be normally closed, and the make contact 11 of the auxiliary relay 11 that operates in the event of an abnormality
When -1 closes, it becomes open.

In the device configured in this way, when the operation command switch is activated and its meter contact 17 is closed, the normal operation start relay 5 is activated via the break contact 15 and the break contact 7-1 of the operation stop command switch. The voltage between the first power line 19 and the second power line 21 is supplied, and the normal operation start relay 5 is activated. When the normal operation start relay 5 is activated, its own make contact 5-1 closes and is self-held via the break contact 15 and 7-1, and its other make contact 5-2 closes, resulting in normal operation. Activate the starting auxiliary relay 9. As a result, the make contact 9-1 of the normal operation starting auxiliary relay 9 closes, and the first valve 1 becomes open.

If an abnormal condition occurs in any part of the plant while the first valve 1 is in the open state and operating normally, the abnormal operation switch is activated and its make contact 23 is opened. When it is closed, the abnormality activation relay 7 is activated. When the abnormal operation relay 7 operates, its break contact 7-1 opens, the normal operation start relay 5 becomes inactive, that is, turned off, and the meter contact 7-1 of the abnormal operation relay 7 opens.
2 is closed, and the abnormal operation auxiliary relay 11 is activated. Normal operation start relay 5 is turned off and its meter contact 5-2
When this is heard, the normal operation start-up auxiliary relay 9 is turned off. As a result, the meter contacts 9 to 1 of the normal operation start-up auxiliary relay 9
is opened, and the first valve 1 is in the closed state. In addition, when the abnormal operation auxiliary relay 11 is activated, its make contact 11-
1 closes, and the second valve 3, which was in the closed state, becomes open.

In this way, if a C1 abnormal condition occurs, the first
The first valve 1 is closed and the second valve 3 is opened to deal with abnormal situations.

Problems with the conventional technology By the way, in the logic detection circuit that operates as described above, if the coil of the relay that operates when an abnormality occurs is disconnected, or the contacts of the relay become in a poor contact state,
Even if the make contact 23 of the abnormality operation switch closes when an abnormality occurs, the first valve 1 iJ3 and the second valve 3 cannot perform the predetermined operation for when an abnormality occurs. This means that, especially in sequence processing related to safety protection, countermeasures against the phenomenon that C1 does not operate when it should operate (malfunction) are better than those that operate when it should not (malfunction). Despite the importance of such malfunctions, such malfunctions are usually only noticed later when a predetermined operation is not performed. However, if you only notice the failure later, the process is slow and the process is slow.
In some cases, C may cause serious trouble to the plant. For this reason, it was necessary to detect errors and failures in advance, but in conventional sequence circuits, at least the detection work must be performed after interrupting control, which is a problem in preventing errors and failures. Pre-detection of motion was not reliable, and improvements were desperately needed.

[Object of the Invention] The present invention has been made in view of the above, and its purpose is to provide a control operation determination device that can detect in advance and reliably malfunction of a control section of a controlled object. It's about doing.

[Summary of the Invention] A control device in which a controlled part is caused to perform a predetermined normal operation by a normal operation control means when it is normal, and then to perform a predetermined abnormal operation by an abnormal operation control means when it is abnormal, wherein the abnormal operation control means a simulated abnormal state setting means for setting a simulated abnormal state for the control unit; and when an abnormality occurs during setting of the simulated abnormal state, the abnormal operation is performed, and the abnormal operation control means causes the abnormal operation of the controlled part to be performed. The gist of the present invention is to include a normal operation maintaining means that does not allow the abnormal operation to occur, and an operation determining means that determines the operating state of the abnormal operation control means when setting a simulated abnormal state.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, a simulated abnormal operation test circuit 31 is added to the sequence circuit shown in FIG. Make contact 3 of relay 35
5-1 is connected, and the simulated abnormal operation starting relay 33 of the simulated abnormal operation inspection circuit 31 is connected in parallel to the make contact 9-1.
The circuit has the same configuration as the circuit shown in Fig. 2, except that the meter contact 33-3 of the circuit is connected, and the break contact 33-4 of the simulated abnormal operation starting relay 33 is connected in series with the meter contact 11-1. be. The circuit shown in Figure 1 uses this added circuit part to test the operation of the sequence circuit shown in Figure 1 when an abnormality occurs, and to detect malfunctions. .

The newly added simulated abnormal operation inspection circuit 31 includes a simulated abnormal operation starting relay 33, a delay operation relay 35, and an operation determination relay 37.

The simulated abnormal operation starting relay 33 has one end connected to the break contact 23' of the abnormal operation switch f-, the break contact 41 of the reset 1 to switch, and the make contact 39 of the simulated abnormal setting switch for setting a simulated abnormal state. The other end is connected to the first power line 19 , and the other end is connected to the second power line 21 . Further, the make contact 33-1 of the simulated abnormal operation starting relay 33 is connected in parallel to the meter contact 39 of the simulated abnormality setting switch. The delay operation relay 35 is a relay for forming a delay time to avoid activation of the abnormal operation relay 7 after a certain time delay after the simulated abnormal operation activation relay 33 is activated. The relay 33 is connected to the first power line 19 via the make contact 33 - 2 , and the other end is connected to the second power line 21 . The operation determination relay 37 has one end connected to the break contact 5-3 of the normal operation start relay 5,
Connected to the first power supply line 19 via the meter contact 7-3 of the abnormal operation relay 7, the break contact 9-2 of the normal operation start-up auxiliary relay 9, and the meter contact 11-2 of the abnormal operation auxiliary relay 11, The other end is connected to the second power supply line 21. 1) The break contact 23' of the abnormality activation switch described in a is a contact of the abnormality activation switch, and operates in conjunction with the make contact 23.

Next, the action will be explained.

When the simulated abnormal operation test circuit 31 is not activated, the operation of each relay 5.7.9.11 that activates the first valve 1 and the second valve 3 is the same as in the circuit shown in Fig. 2. It is. As described above, when the make contact 17 of the operation command switch is activated, the first power supply line 19 and When the voltage between the second power supply line 21 is supplied to the normal operation start relay 5 and the normal operation start relay 5 is operating, the make contact 5-1 is self-held, and
The normal operation starting auxiliary relay 9 is actuated at the make contact 5-2, and the first valve 1 is controlled to be open at the meter contact 9-1.

Further, in this state, the second valve 3 is in a closed state, and the other relays 7,11,33,35,37 are in an off state.

In this way, when the circuit is operating normally and, for example, the first valve 1 and the second valve 3 constituting the plant are in a predetermined normal operating state, the simulated abnormality setting switch is activated and its make contact is activated. 39, the simulated abnormal operation testing circuit 31 is activated. In other words, when the meter contact 39 of the simulated abnormality setting switch closes, the break contact 4
1 and the break contact 23', the simulated abnormal operation starting relay 33 is actuated via the make contact 33-1 and the break contact 23'.
At the same time, the meter contact 33-3 in parallel with the make contact 9-1 closes, and the break contact 33-4 in series with the make contact 11-1 opens, simulating abnormal operation of each contact. Assist in preparation for action. Further, the simulated abnormal operation activation relay 33 activates the delay operation relay 35 through its make contact 33-2. After a delay time corresponding to the operating time of the relay 35, the meter contact 35-1 of the relay 35 is closed to avoid operating the abnormality activation relay 7, thereby creating a simulated abnormality state.

When the abnormality operation relay 7 is activated, the operation is the same as that in the case of the abnormality described above.
The normal operation start relay 5 is turned off by the opening operation of
Normal operation start auxiliary relay 9 by its make contact 5-2
is turned off, and the abnormal operation auxiliary relay 11 is activated by the closing operation of the make contact 7-2. As a result, when the make contact 9-1 of the relay 9 is opened, the meter contact 11-1 of the relay 11 is closed. This state is a state in which the above-mentioned abnormal state has occurred, and the states of each relay at this time are OFF, normal operation start relay 5 is OFF, abnormal operation relay 7 is ON (operated), and normal operation start auxiliary relay 9 is ON (operated). When the auxiliary relay 11 is off and on, the break contacts 5-3 and 5-3 are connected in series, respectively.
The operation determination relay 37 is activated via the meter contact 7-3, the break contact 9-2, and the make 1 water point 11-2, and the operation determines that the processing operation for the abnormal state is normal. They are given a J-nick. This can be checked whether the operation of the operation determination relay 37 is normal or not by, for example, activating an alarm (not shown). Note that even if the relay 9 is turned off and the relay 11 is turned on due to the simulated abnormal operation, the make contact 33-3 operates in parallel to the meter contact 9-1 of the relay 9, and the make contact 11 of the relay 11 operates in parallel. Since the break contact 33-4 opens and opens in series with -1, the operations of the first valve 1 and the second valve 3 are not disturbed, and both valves operate normally. It continues. -d'/, tStraw, by activating only each relay without interfering with the operation of the valves that make up the plant,
Checking the normality of circuit operation has become extremely difficult.

Well, when the simulated abnormal operation inspection circuit 31 is activated in this way and an actual abnormal condition occurs while the simulated abnormal operation is being inspected, the meter contact 23 of the abnormal operation switch closes. At the same time, the break contact 23' opens, so the simulated abnormal operation starting relay 33 turns off.
The make contact 33-3 is open and the break contact 33-/
l is closed.

At this time, the make contact 9-1 of the normal operation starting auxiliary relay 9 has already been heard in the simulated abnormal operation, and the make contact 11-'1 of the abnormal operation auxiliary relay 11 is closed, so the first valve 1 is closed. 7. Closed. f, the second valve 3 is in the open state. In addition, in this operation, when the C1 simulated abnormal operation starting relay 33 is turned OFF 'eL-), the delay operation relay 35 is also turned OFF and its make contact 35-1 is opened, but at this time, in the case of abnormality 1' [ Since the dynamic relay 7 has already been maintained in operation by the abnormal operation switch 23, the problem is <r1.Also, even if an actual abnormal condition occurs in this way, the operation determination Relay 37 is relay 5.7
．． It is activated by the operation of each contact point of 9.11, and f1 is checked to confirm that the abnormality processing has been reliably carried out.

Furthermore, in order to run such a simulated abnormality from 1 to 1, activate and listen to the break connection +ja/II of the reset switch, set the simulated abnormal operation starting relay 33 to A, and also set the delay operation relay 35. Turn off. This turns off the abnormal operation relay 7, and the closing operation of the break contact 7-1 turns on the normal operation start relay 5. As a result, the normal operation start-up auxiliary relay 9 is turned on, and the abnormal operation auxiliary relay 1 is turned off, so the first valve 1 continues to be opened by the meter contact 9-1 of the normal operation start-up auxiliary relay 9. However, the second valve 3 continues to be closed due to the closing operation of the make contact 11-1 of the abnormal operation auxiliary relay 11.

When the break contact 15 of the operation stop command switch is activated and opened during normal operation when the simulated abnormal operation inspection circuit 31 is not activated, the normal operation start relay 5 is turned off, and all relays 7, 9, and 11 are turned off. becomes A, so the first
Both the valve 1 and the second valve 3 are closed, and the operation is stopped.

In the above embodiment, after the simulated abnormal operation activation relay 33 is activated, a delay time is provided by the delay operation relay 35 to activate the abnormality activation relay 7, but this delay time is not formed by a timer. Alternatively, the abnormal operation relay 7 may be activated after the simulated device normal operation start ζ rule 33 is fully activated, or the simulated abnormality setting switch may be activated to activate the simulated abnormal operation. Start relay 3
After activating 3, the abnormality activation relay 7 may be manually activated in two stages using another switch.

Furthermore, in the above embodiment, the test results are checked by the operation determination relay 37, but the contacts 5-3 of each relay are used.
For example, the states of 7-3.9-2.11 to 2 may be input into a microcomputer and judged by the microcomputer.

In the above embodiment, the case where the control unit is configured with a relay has been described, but it is not limited to a relay.
Of course, a semi-η-body element such as a transistor or other component may also be used. Furthermore, it goes without saying that the controlled parts are not limited to the first valve 1 and the second valve 3.

[Effects of the Invention] As explained above, according to the present invention, during the normal operation of a plant, etc., a simulated abnormal operation is generated and the abnormal state is dealt with without interfering with the normal operation. Since it is determined that the operation is being performed accurately, the processing operation for the abnormal condition can be reliably checked in advance before an actual abnormal condition occurs, and the safety of the control unit can be improved. can. In addition, in this simulated abnormal operation, J
- You can check the safety of the operation at any time. In general, J
In many cases, a malfunction or non-operation has a more fatal effect on the controlled part, but since this invention specifically checks the operation against malfunction or malfunction, the safety of the control part is improved in this respect as well. I'm letting you do it. In particular, the control section is a relay (゛′
In cases where relays are drawn, an oxide film tends to form on the contacts of relays that do not operate all the time, reducing the reliability of operation, but this can also be checked at any time.''2. Operating the relay prevents the formation of an oxide film on the relay and also contributes to the reliability of the relay.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a relay sequence circuit implementing a control operation determining device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing an example of a conventional relay sequence circuit. 5... Normal operation start relay, 7... Abnormal operation relay, 9... Normal operation start auxiliary relay, 11... Abnormal operation auxiliary relay, 17... Make contact of switch f for operation command, 23...Make J & point of abnormal operation switch, 33...Simulated abnormal operation start relay, 335...Relay for delayed operation, 37...1 rule for operation judgment, 39.
...Meter contact of switch for setting simulated abnormality. Figure 1/Figure 2

Claims (1)

[Claims] In a control device that causes a controlled part to perform a predetermined normal operation by a normal operation control means when it is normal and to perform a predetermined abnormal operation by an abnormal operation control means when it is abnormal, a simulated abnormal state is applied to the abnormal operation control means. a simulated abnormal state setting means for setting a simulated abnormal state, and a control holding unit that performs the abnormal operation when an abnormality occurs when setting the simulated abnormal state, and prevents the controlled part from performing an abnormal operation by the abnormal operation control means. and an operation determining means for determining an operating state of the abnormal operation control means when setting a simulated abnormal state.