JPS60238906A - Device for detecting abnormal operation of sequence circuit - Google Patents

Abstract

PURPOSE:To easily explicate the cause of an abnormal operation of a sequence circuit, by comparing signals indicating the operating state of a circuit element with previously stored operating state signals whenever the operating state of the circuit element changes and, when they do not continuously coincide with each other, deciding the operating state of the circuit element as abnormal one and storing the operating state signals before and after the abnormal state occurs. CONSTITUTION:Signals indicating operating states of plural representative circuit elements 2, 3, 5, and 6 of a sequence circuit are inputted in an operation comparing and deciding section 11 through an input section 8 in the orde of operation. On the other hand, signals from a storage section 9 which previously stores the operating states and operating order of the circuit elements 2, 3, 5, and 6 in the form of digital signals (ON-OFF signals) are inputted from an operation setting section 10 and the first mentioned signals are compared with the second mentioned signals. When a main device 7 is operated, an operation stage at which both signals coincide with each other is firstly retrieved and a state in which both signals continuously coincide with each other with a change in the operating state in-between is retrieved by using the retrieved stage as the starting point. If a section continuously showing the similar change does not exist in the other section of the storage section 9 when discordance occurs, it is judged as an abnormal state and operating states before and after the abnormal state occurs and the current signal is stored.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention constantly monitors the operating state of all circuit elements constituting a sequence circuit or the operating states of a plurality of circuit elements therein according to the operating order, and The present invention relates to an operation abnormality detection device for a sequence circuit that determines an abnormality when the state differs from an operating state determined by a sequence, displays an alarm 1, and records the operating state before and after the occurrence of the abnormality.

[Employee technology]

Conventional sequence circuit operation detection methods include: - Each time the operating state of circuit elements such as contacts and coils that make up the sequence circuit changes, the time of the change, the circuit element that changed, and the details of the change are printed out. When an abnormality occurs, the record is read later and the cause of the abnormality can be determined by tracing the circuit operation. ■A method has been adopted in which the operating status of circuit elements is constantly recorded on magnetic tape, etc., and the cause of the abnormality can be later determined in the same way as the method described in The disadvantage is that it requires a lot of effort and time.

[Purpose of the invention]

The present invention has been made to improve the above-mentioned drawbacks, and the present invention stores in advance the operating states and operating orders of all or a plurality of circuit elements constituting a sequence circuit in a storage section using signals. Then, each time the operating state of a circuit element changes, the sequence circuit is constantly monitored by comparing the signal representing the operating state with the signal representing the operating state stored in the storage section, and both signals are checked according to the order of operation. An abnormality detection device for sequence circuits that determines that the sequence circuit is normal when they match continuously and continues monitoring the circuit, and when both signals no longer match, it determines that it is abnormal and displays alarm 2. It is possible to record the time of abnormality occurrence and the operating status of the circuit elements before and after the abnormality occurrence by means such as memorization or printing, which not only greatly reduces the labor and time required to clarify the cause of the abnormality, but also Self-determine and monitor abnormality detection of sequence circuits from any operating stage.

It is an object of the present invention to provide an operation abnormality detection device for a sequence circuit that can detect abnormalities.

[Structure of the invention]

In order to achieve the above object, the device of the present invention has all the circuit elements 2°3.3g constituting the sequence circuit as shown in the figure.
4, 4a, 4b, 5, 5a, 6 or a plurality of circuit elements 2, 3, 5.6 therein, an input unit 8 that inputs signals representing the operating states of the circuit elements 2, 3, 5.6 according to the operating order and sequentially outputs the signals;
a storage unit 9 that stores in advance signals representing the operating states of all the circuit elements or a plurality of circuit elements and signals representing the operation order;
input the signal output from the input section 8, compare this signal with the signal stored in the storage section 9, search for a state in which both signals match consecutively according to the operating order, and both signals match. If the condition continues, the operation comparison judgment/operation control unit 11 determines that the sequence circuit is normal, continues monitoring the sequence circuit, and outputs an abnormal signal at the operation stage where the two signals no longer match and the signals at the operation stages before and after that. Then, the abnormality signal output from the operation comparison judgment/operation control section 11 is inputted to output a signal for displaying alarm 2, and the signals at the operation stages before and after the occurrence of the abnormality are inputted to determine the timing before and after the occurrence of the abnormality. The configuration includes an output section 12 that outputs a signal for recording the operating state of a circuit element.

3- [Configuration of Embodiment] FIG. 1 is a connection diagram showing an example of a sequence circuit to which the present invention is applied, and FIG. 2 is a time chart for explaining its operation.

First, to explain the sequence circuit in Figure 1, 111°1
b is the power line, 2 is the input contact, 3 is the relay (coil)
, 31 is its normally open contact, 4 is the first timer (coil), 4
m, 4b is its normally open contact, 5 is the second timer (coil),
5. is its normally closed contact, and 6 is a solenoid valve (solenoid).

In this sequence circuit, as shown in the second diagram, when the input contact 2 closes, the relay 3 operates and the normally open contact 3m closes, self-holding occurs, and the first timer 4 starts operating, and the first timer time 1a elapses. Afterwards, the normally open contact 4°4b closes. The closing of the normally open contact 41 causes the second timer 5 to start operating, and the closing of the normally open contact 4b causes the solenoid valve 6 to operate. When the second timer time tb has elapsed, the normally closed contact 51 opens and the relay 3
returns and the normally open contact 3a opens. When the normally open contact 3a opens, the first timer 4 returns, the normally open contacts 4° and 4b open, the second timer 5 returns, and the normally closed contact 5a closes, and the solenoid valve 6 returns. .

If the operating sequence of this sequence circuit is created according to the operating order, it will be as shown in Table 1 below. However, the circuit elements (contacts, relays) that make up the sequence circuit.

Displays the operating status of timers, solenoid valves, etc.) as on or off.
The operation stages and the operation order are shown by t4 to (2) (see FIG. 2).

Table 1 Although all of the circuit elements constituting the sequence circuit may be monitored for their operating states to detect abnormalities, typically a plurality of circuit elements are selected, their operating states are monitored, It is preferable to perform abnormality detection because it leads to a reduction in the amount of data and makes it easier to clarify the cause of the abnormality.

Now, the circuit elements to be monitored are input contact 2° and relay 3.
．． If a total of four circuit elements, the second timer 5 and the solenoid valve 6, are selected, their operation will be as shown in Table 2 below.

Table 2 Next, a configuration of an embodiment of the present invention for monitoring the operating states of a plurality of circuit elements selected as described above and detecting an abnormality will be described.

FIG. 3 is a block diagram showing the configuration of one embodiment of the device of the present invention. In Figure 3, 2, 3, and 5.6 are the input contacts, relays, second timers, and solenoid valves that constitute the sequence circuit, respectively.Hereinafter, these will be referred to as circuit elements, and their operating states will be explained as on and off. Make it.

7 is the device of the present invention. 8 is 4 circuit elements 2゜3.5
．． The signals representing the operating states of 6 (see Table 2) are assigned to the operating order 1.
This is an input section that inputs data according to -v and outputs them sequentially.

9 sets the operating states and operating order of the four circuit elements 2, 3, 5.6 in advance by digital signals (on,
This is a storage section in which the data is stored through the operation comparison/judgment/operation control section 11 at the off signal).

11 inputs the signal output from the input section 8, compares this signal with the signal stored in the storage section 9, searches for a state where both signals match consecutively according to the operation order, and searches for a state where both signals match. If it continues, it is determined to be normal and the sequence circuit is continued to be monitored, and at the operating stage where both signals no longer match, an abnormal signal, the time at which the abnormality occurred, and signals from the operating stages before and after that are output.7- Operation Comparison Judgment The apparatus is equipped with an operation control section that controls the mutual operations of the human body, the output sections 8 and 12, the storage section 9, and the operation setting section 10.

Reference numeral 12 inputs the abnormality signal output from the operation comparison/judgment/operation control section 11 and outputs a signal for displaying alarm 1, and also indicates the abnormality occurrence time, circuit elements 2, 3, 5.6 before and after the abnormality occurrence. This is an output section that outputs a signal for recording the operating state of the device.

13 is an alarm circuit that inputs the output alarm signal of this output section 12 and issues an alarm; 14 is a lamp circuit that also inputs an output display signal and lights up and displays; 15 is a lamp circuit that also inputs an output recording signal and outputs the abnormality occurrence time and abnormality. A printer 16 is another recording device that prints the operational status of the circuit elements before and after the occurrence.

[Effect of the embodiment]

The effect will be explained below. When the device 7 of the present invention is operated, signals representing the operating states of the circuit elements 2, 3, 5, and 6 are input to the input section 8. The signal output from the input section 8 and the signal stored in the storage section 9 are collated by the operation comparison/judgment/operation control section 11 to search for an operation stage where both signals match. If you can find it, temporarily monitor it.
The position is memorized as the abnormality detection starting point, and the operating state of the circuit elements 2, 3, 5.6 changes in the next operation stage, and the input section 8
Wait for the output signal to change. When the change occurs, the output signal from the input section 8 is compared with the signal output from the storage section 9 according to the operation order, and it is determined whether the two signals match. If they do not match, search for a state where both signals match continuously from the previous operation stage to the next operation stage, and if there is a matching part, set the temporary monitoring abnormality detection starting point that was previously stored in the memory. , re-assume the ellipse at the beginning of the action phase that matched this time. Thereafter, the above search operation is repeated nine times to automatically search for a state in which both signals match consecutively in accordance with the operation order.

For example, when the operating state of circuit elements 2, 3, and 5.6 is in operating stage ■ in Table 2, that is, when circuit elements 2 and 5.6 are off and circuit element 3 is on, the signal representing this operating state is If the device 7 of the present invention starts operating when the signal is OFF, ON, OFF, OFF, the operation comparison/determination/operation control unit 11 outputs the OFF signal from the input unit 8.

On, off, off signals and signals stored in the storage unit 9 (
Operation step 111 - Search and temporarily monitor all the signals (listed in Table 2) in which both signals match.

Use as the starting point for abnormality detection. Circuit element 2.3 in the next operating stage
, 5.6 changes and the output signal of the input section 8 changes. , the operating state of the circuit element 5.6 changes from OFF to ON, and the output signal of the input section 8 changes from OFF, ON, ON, ON, the operation comparison judgment/operation control section 11 detects the assumed monitoring and abnormality. The operating state of the operating stage (2) following the operating stage (2), which is the detection start point, is read out from the storage section 9 and compared with the output signal of the input section 8. As mentioned above, the output signal of the input section 8 is OFF, ON, ON, ON, and the operating state of the operation stage (2) read from the storage section 9 is OFF, ON.

Since it is on and on and matches continuously, in this case, the temporary monitoring/abnormality detection starting point is the operation stage as originally assumed.
Totoma ＼Wait for the next input state change. The operations as described above are repeated to continue monitoring the operations. However, if only the operating state of the circuit element 3 changes from on to off and the output signal of the input section 8 changes from on to off, then the operation comparison/determination/operation control section 11 outputs an off signal from the input section 8. , OFF, ON of operation stage (3) outputted from the storage section 9 according to the OFF, OFF, OFF signals and the operation order.

Compare the on and on signals and determine whether the two signals match. If they do not match, a search is made to see if there is a part in the storage unit 9 in which the operating states from the previously assumed starting point of monitoring/abnormality detection to the input state that has changed continuously match. . That is, the input section 8 continuously outputs OFF and ON signals.

There is a state in which the signals output from the storage unit 9 in response to the off, off signal and the off, off, off, off signal become the same off, on, off, off signal and off, off, off, off signal. Search to see if it exists. Then, the first part that newly matches is set as a new temporary monitoring/abnormality detection starting point. Thereafter, the above search operation is repeated to search for a state in which both signals consecutively match according to the operation order.

When the circuit elements 2, 3, and 5.6 operate normally, the search operation causes both signals to match consecutively. For example, when the operation stage shifts from ■ to ■ and the output signal of the input section 8 changes from the off, on, off, off signal to the off, on, on, on signal, the output signal of the contents of the storage section 9 changes in the same way, and both signals match. When the state in which both signals match continues like this, it is normal, and the operation comparison/judgment/operation control section 11 does not output the signal, but continues to compare both signals in accordance with the operation order to monitor the sequence circuit. I will continue.

In this embodiment, circuit elements 2, 5.6 are off.

Circuit element 3 is on and the output signal of input section 8 is off.

When the signal is on, off, and off, there is only one operation stage ■, and in the next operation stage IV, circuit element 2 is off, circuit elements 3 and 5.6 are on, and the output signal of input section 8 is off. ,
It should be an on, on, on signal. Therefore, when transitioning from operation stage ■ to ■, only circuit elements 3 and 5 are on and the output signal of input section 8 becomes an off, on, on, off signal. Since there is no part that changes in the storage unit 9, it is determined that it is abnormal, and the operation comparison 12- determines the abnormality signal and the abnormality occurrence time from the determination and operation control unit 11.
It outputs a signal for recording the operation step (1) before and after that and the input signal of the input section 8.

The alarm circuit 13 and the lamp circuit 14 each receive an abnormality signal, issue an alarm, and display a one-light display. In addition, a recording signal is input to the printer 15 to record the time when the abnormality occurred.

The operational states of circuit elements 2, 3, 5.6 before and after the occurrence of an abnormality are printed and recorded. Further, other recording devices 16 can also record in the same manner.

In the present invention, the number of operation stages (step number) for storing the operation states of a plurality of circuit elements in the storage section 9 is determined depending on the purpose of monitoring or whether there are many or few changes in the operation states. In addition, as in the embodiment, a digital signal is stored,
Not only when detecting abnormalities by monitoring digital inputs, but also when storing analog signals such as pressure, temperature, voltage, current, distance, etc., and detecting abnormalities by monitoring analog inputs. It can also be applied to

〔Effect of the invention〕

As is clear from the above description, according to the present invention, all the circuit elements 2, 3, 3 . .

4, 4a, 4b, 5, 5a, 6 or a plurality of circuit elements 2, 3, 5.6. A storage unit 9 that stores signals representing the operating state and operation order of the circuit element or a plurality of circuit elements, and a signal output from the input unit 8 is inputted, and this signal is stored in the storage unit 9. It compares the signals and searches for a state in which both signals match consecutively according to the operating order, and when the state in which both signals match continues, it is determined to be normal and the sequence circuit continues to be monitored. An operation comparison/determination/operation control section 11 that outputs an abnormal signal at an operation stage where no matching part exists and a signal at the operation stages before and after that, and an abnormal signal output from this operation comparison/judgment/operation control section 11 are input. an output section 12 which outputs a signal for displaying an alarm 1 at the time of occurrence of the abnormality, inputs signals at the operating stages before and after the occurrence of the abnormality, and outputs a signal for recording the operating state of the circuit element before and after the occurrence of the abnormality; Therefore, every time the operating state of all or a plurality of circuit elements changes, the sequence circuit is constantly monitored by comparing a signal representing the operating state with a signal representing the operating state stored in the storage section 9, If both signals match continuously according to the operating order, the sequence circuit is determined to be normal and circuit monitoring can be continued; when both signals no longer match, it is determined to be abnormal and alarm 1 is displayed. At the same time, it is possible to record the time of abnormality occurrence and the operating status of circuit elements before and after the abnormality occurs, which not only greatly reduces the effort and time required to clarify the cause of the abnormality, but also allows the detection of abnormalities in sequence circuits to be performed at any operating stage. Even if you start from scratch, you can self-judge and monitor and detect abnormalities.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram showing an example of a sequence circuit to which the present invention is applied, FIG. 2 is a time chart for explaining its operation, and FIG. 3 is a block diagram showing the configuration of an embodiment of the device of the present invention. . 2...Input contact, 3...Relay, 3i
1... Normally open contact, 4... First timer, 4. ．． 4b... Normally-1-open contact, 5... Second timer, 5a...
・Normally closed contact, 6...Solenoid valve, 7...
- Device of the present invention, 8... Input section, 9...
...Storage section, 10...Operation setting section, 11...
...Operation comparison/judgment/operation control unit, 12...Output section, 13...Alarm circuit, 14...Lamp circuit, 15...Printer, 16...
・Other recording devices. 16- Note 1 Qin 2nd III IVVI

Claims (1)

[Claims] an input section that inputs and sequentially outputs predetermined signals representing the operating states of circuit elements constituting the sequence circuit; a storage section that stores in advance signals representing the operating states and operating orders of the circuit elements; Inputs the signal output from the input section, compares this signal with the signal stored in this storage section, searches for a matching state, and when both signals match, it is determined to be normal and continues monitoring the sequence circuit. When the two signals do not match, or when the input signals are not consecutive according to the operating order of the storage unit, a signal according to the operating order is searched for, and if both signals still do not match, an operation comparison judgment is performed that outputs an abnormal signal.・An operation abnormality detection device for a sequence circuit consisting of an operation control section.