JPS59106008A - Sequence monitoring device - Google Patents

Abstract

PURPOSE:To attain a sequence monitoring device which selects automatically check items by providing a learning operation mode besides a normal monitor operation mode. CONSTITUTION:When an operation mode designating signal 17 designates the learning operation mode, a switch 20 is closed, and control signals 5a and 5b and corresponding operation signals 4b and 4c are inputted to a detecting device 19. The detecting device 19 detects the state change of each input signal and supplies it to a storage device 15. In this learning operation mode, a sequence control is executed plural times repeatedly. On a basis of stored contents of the storage device 15 at this time, a check signal table is generated automatically. After generating this check signal table, the mode is returned to the normal monitor operation mode. Thus, the sequence monitoring device which selects automatically check items is attained.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to the operation status and This invention relates to a sequence monitor device that monitors the response operation status of a plant and, when an abnormality occurs, notifies the cause of the abnormality.

[Prior art]

The conventional device of this type is the one shown in FIG. In the figure (1) is the sequence monitor 1ffiffi, +
21 is a sequencer, and (3) is a plant such as a generator.

Also, (4) is the input signal -Q, +51 from the plant (3).
is the control signal that the sequencer (2) outputs to the plant (3), (6) is the judgment result signal of the sequencer (2),
(7) shows the monitoring result signal of the sequence monitor device.

Figure 2 shows the sequence monitor equipment shown in Figure 1.
and a block diagram showing the internal configuration of the sequencer (2), where the same symbols as in FIG. 1 indicate the same parts, (4a), (4b)
.

(4c) is a signal corresponding to signal (4) in Fig. 1, (5a
).

(5b) is a signal that is mixed with signal (5) in Fig. 1, (6a
).

(6b) is a signal corresponding to signal (6) in FIG.

FIG. 2 shows an example in which the number of steps of sequence control is two. (4a) is a start condition signal for the first step of sequence control, which is input from the rear, plant (3; or plant control console, etc.) to the sequencer (2) and sequence monitor device (1). (5a) is the first step start condition signal. Plan from sequencer (2) with control signals corresponding to step control)
(Output to 3+ and sequence monitor device (1).

(46) is a response signal from the plant (3) that operated in response to the control of the first step, and is input to the sequencer (2) and sequence monitor device #(1).

(6a) is a first step completion determination signal, which is output from the sequencer (2) to the sequence monitor device (1).

(5b) is a control signal corresponding to 22-step control,
It is output from the sequencer (2) to the plant (3) and the sequence monitor device (1). (4C) is a response signal from the plant (3) that operated in response to the second step control, and is output to the sequencer (2) and the sequence monitor device. (6b) is the completion judgment signal of the second step, which is sent from the sequencer (2) to the sequence monitor device (1).
Output to.

Next, (8a) and (8b) are the first and second
(9a), (9b)
) are pressure devices, (10a) and (10b) are judgment devices, (lla) and (llb) are timers, (12a).

(12b, l ld respective timers (lla, ), (
131 is a processing device, and (g) is a storage device.

Sequence monitor device (1) as well as sequencer (2)
In many cases, a small computer is used to perform various processes under program control.
Output device TIE (9a), (9b), judgment device (10a)
).

(10b), a processing device (131), a storage device (c), etc. are mechanisms that execute their respective operations (described in a later section), and do not necessarily require dedicated hardware.

That is, (9a) and (9b) are the first. A mechanism that outputs control signals (5a) and (5b) according to the second step;
(10a) and (10b) are mechanisms for inputting response signals (4b) and (4) to determine the completion of the corresponding step.

Next, the operation will be explained. Signal (4a) is the plant (
3) or other external input to the sequencer +21, the sequencer (2) judges the start of the first step according to (8a), and the output device (9a) also outputs the judgment result of (8a). and outputs a control signal (5a) to the plant (31) and the sequence monitor device (1).Plant (3)
operates in response to the control signal (5a), and outputs a response signal (4b) as a result of its operation. The signal (4b) is input to the determination device (10a), it is determined that the control of the first step has been completed, and the timer (lla) is output as the completion determination signal (6a).
is input. Normal case judgment device (10a), (1
0b) is mainly composed of an AND circuit of its input signals (4b) and (4c). The signal (6a) simultaneously becomes the start condition for the second step, which is judged in (8b), the control signal (5b) is output from the output device (9b), and the same operation as in the first step is performed. .

On the other hand, when the signal (4a, l 75" is input to the timer (11a), the timer (lla) starts timing, and the signal (
When 6a) is input, the time measurement is stopped. Signal (6a
) is input to the timer (iib), the timer (flb
) starts counting time, and stops counting when the signal (6b) is input. If the time from the start to the stop of time measurement exceeds the predetermined time, an error signal (12a
12b) is output.

Since the storage device (2) stores in advance a table (referred to as a test signal table) showing the names of signals to be tested and their signal states corresponding to each step, the error signals (12a), ( 12b) is input to the processing device (13), the processing device αJ reads out the test signal table of the step corresponding to the error signal from the storage device (G), and uses it as the currently input signal (5a), ( 4b)
Or, determine the cause of the output of the error signal by comparing it with the signal states of (5b) and (4c), and output it as a monitoring result signal (7), indicating the step number where the sequence abnormality occurred and the sequence abnormality. The cause of the failure can be communicated to the operator or external equipment.

Conventional sequence monitor devices are configured as described above, so if the sequencer control items or step completion condition items are changed, the sequence monitor device must also be changed, which reduces the frequency of changes and modifications. The disadvantage was that it became thicker. Furthermore, if the sequencer control items and step completion condition items have not yet been determined, there is a drawback that the design of the sequence monitor device cannot be determined.

[Summary of the invention]

It is an object of the present invention to eliminate the above-mentioned drawbacks in conventional devices, and for this purpose, the present invention provides a learning operation mode in addition to the normal monitor operation mode as the operation mode of the sequence monitor device. When connecting to a new sequencer, perform each step of sequence control many times in the learning operation mode, record the state changes of each control signal and each response signal in this many times of sequence control, and use this record as the basis. After the test signal table is created, the normal monitor operation mode is returned to and the sequence control is monitored. Therefore, according to the present invention, it is possible to provide a sequence monitor device that automatically selects inspection items.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 3 is a Mizuko block diagram of an embodiment of the present invention, where the same reference numerals as in FIG. 2 indicate the same or Buddhist priest parts.
b) is a storage area for each of the first and second steps in the storage device (to). αQ is the sequence monitor device of the present invention, (LnM operation mode designation signal, decoy is the learning mode control device, (L'IN is the detection device, □□□ is the input switch, (21) is the output switch, (22) is The reset signals (23a) and (23b) are
Input switches related to the second step, (24a), (
24 are cleared in the first and second step registers, respectively.

When the sequence monitor device α0 is newly connected to the sequencer (2) and the plant (3) as shown in Fig. 1,
The driving mode designation signal α specifies the learning driving mode, and the learning mode control device (18 closes and connects the switch (4) to generate each control signal (5a), (5b) and each response signal (4b).

(4c) is inputted to the detection device, the switch (21) is opened, and the reset signal (22) is inputted to the storage device (g), erasing the data previously stored in the storage device αυ. In this learning mode, sequence control is repeated a plurality of times (hereinafter referred to as N times).

The start condition signal (4a) of the first step closes the switch (23a) and opens the switch (23b).

The completion judgment signal (6a) of the first step opens the switch (23a) and closes the switch (23b), and the completion judgment signal (6b) of the second step opens the switch (23a).
).

(23b) is opened.

The detection device σ9 detects the state change of each input signal (change from logic "0" to logic "1" and change from logic "1" to logic "0"), and at the time of this detection, the signal name (signal number ) and its direction of change as an occurrence event, the register (24a) is sent via the switch (23a) or (23b, )
) or (24b). A register (24a) under program control by the processing unit t1m.

(The signal name of the contents of 24bJ is already in the storage device (15a),
Check whether the signal name is registered in (15b), and if the signal name is not registered, register it anew and record the number of occurrences as 1, and if the signal is already registered, the occurrence of that signal. Multiply the number of times by 1.

Each signal (5a) at each step of sequence control.

(4b), (5b), and (4c) do not change once, or if each step is separated so that they change only once, after N times of sequence control is executed, the storage device ( The number of signal changes registered in each area (15a) and (15b) of 2) should be approximately N. A signal showing a significantly lower number of occurrences than N means that it is a signal that does not originally change within the step. Further, unregistered signal names are signals that do not change within the step, and therefore do not need to be stored as test signal names. If N is set to a relatively large value, it can be easily determined whether it is equal to N or not.
, (15b), it is possible to leave only the test signal item and erase the others.

In this way, the learning operation mode is changed and the contents of the memory device are adapted to the new sequence control.

After being rewritten, switch to normal monitor operation mode.
It can be operated in the same manner as the conventional device shown in FIG.

Note that although the above example shows the case where the number of steps is 2,
A storage area corresponding to the number of steps and a corresponding register and input space are provided. This allows the invention to be applied to any number of steps.

Further, in the above explanation, it is assumed that each signal is a continuous signal, but if the signal is a pulse signal, a flip-flop circuit may be provided to convert the signal into a continuous signal.

Furthermore, when the sequencer performs a plurality of sequence controls, this can be handled by providing storage areas for each sequence control ridge type and each step within each sequence control.

In addition, in the learning operation mode, the first signal change occurrence event is unconditionally registered in the storage device oQ, and from the second time onwards, the presence or absence of the same event is checked and those where the same event does not occur are deleted. The items of the test signal can also be determined by the following method.

Furthermore, in the case where the operator performs predetermined control of the start and completion of each step manually6, or the control signal (
Response signal (4a) without using 5a) and (5b).

(4b) The device of the present invention can also be used when monitoring Vc.

In the above description, it is assumed that the state of the signal changes within the same step once or less, but it is also possible to cope with the case where the state changes twice or more by appropriately selecting the number of times of determination.

〔Effect of the invention〕

As described above, according to the present invention, a sequence monitor device can be manufactured independently of the control contents of a sequencer, so that productivity can be increased and manufacturing costs can be reduced.

Further, the sequence control program is often changed in accordance with the actual plant, and the apparatus of the present invention can easily cope with such changes.

Furthermore, since the adjustment of this device is performed automatically in the learning operation mode, the time and cost required for adjustment can be significantly reduced.

[Brief explanation of the drawing]

171 is a block diagram showing a conventional device, FIG. 2 is a block diagram showing the internal configuration of the sequence monitor device and sequencer shown in FIG. 1, and FIG. 3 is a block diagram showing an embodiment of the present invention. . +21 ・7-Kensa, (31-・Plant, (11a
L' (11b)...Timer, αυ...Storage device, αQ...Sequence monitor device, (1 mark...
Learning mode control device, (L9 river detection device, (23aL)
23b) = input switch, (24a). (24b)... Each register. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 1 Procedural amendment (spontaneous) Mr. Commissioner of the Japan Patent Office 1, Indication of the case Patent application No. 57-216551 2
, Name of the invention Sequence monitor device 3, Relationship with the person making the amendment Patent applicant Representative: Hitoshi Katayama Department 4, Agent address: 5, Mitsubishi Electric Corporation, 2-2-3 Marunouchi, Chiyoda-ku, Tokyo , Subject of amendment (1) Detailed explanation of the invention in the specification column 6, Contents of amendment (11 Specification, page 3, line 15 r (46, I Correct J to r (4b) J . that's all

Claims (1)

[Scope of Claim] A sequence monitor device for monitoring operating conditions when sequence control of a plant is performed by a sequencer, comprising: a learning mode control device for controlling switching from a normal monitor operation mode to a learning operation mode; a detection device that detects changes in the state of each signal input from the sequencer and the plant in the mode; and a detection device that detects changes in the state of each signal input from the sequence control and the plant; and The state change is stored in the storage device corresponding to the step.
means for classifying and summing occurrence events by signal and direction of signal change, and after repeating the same sequence control multiple times in the learning operation mode, the cumulative value of occurrence events in the storage device; A sequence monitor device characterized by comprising: means for leaving only signal names of occurrence events approximately equal to the number of repetitions in the storage device as test signal names, and using them as test signal names in the normal monitor operation mode. .