JPS59111507A - Sequence monitoring device - Google Patents

Abstract

PURPOSE:To cope easily with a change of program by providing a learning operation mode in addition to a monitor operation mode to measure and store each step necessary time of control in the learning mode and deciding the monitor set time from the mean value of the step necessary time. CONSTITUTION:A learning operation mode is provided to a sequence monitoring device 16 in addition of a normal monitoring operation mode. The learning operation mode is designated with an operation mode designation signal 17 to obtain a monitor set time appropriate to the sequence control. A learning mode controller 18 erases previously the contents of registers 26a and 26b in the learning operation mode and then repeats the new sequence control several times. In this case, a detector 19 obtains the timing signal of each step. This signal is supplied to a calculating device 24a to calculate the mean value of each step and the square mean value together with a register 26. These mean values are stored in the register 26. Then the monitor set time is decided for timers 11a and 11b respectively from the stored mean values.

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]

A conventional device of this type is shown in FIG. In the figure, (1) is a sequence monitor device, (2) is a sequencer, and (3) is a plant such as a generator.

In addition, (41 is an input signal from the plant (3), (5) is a control signal that the sequencer (2) outputs to the plant (31), (61 is a judgment result signal of the sequencer (21), (
71 indicates a monitoring result signal of the sequence monitor device.

FIG. 2 is a block diagram showing the internal configuration of the sequence monitor device (1) and sequencer 12) shown in FIG. 1, where the same reference numerals as in FIG. 1 indicate the same parts (4a) and (4b).

(4c) is a signal corresponding to signal (4) in Fig. 1, (5a
)1(5b) is a signal corresponding to signal (5) in FIG.
6a)1 (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 plant (3) or a control console of the plant to the sequencer (2) and sequence monitor device (2). (5a) is the first step start condition signal. A control signal corresponding to step control is sent from the sequencer (21) to the plant (
3) and output to the sequence monitor device (1). (
4b) is a response signal from the plant (31) that operated in response to the control of the first step and is input to the sequencer (2) and the sequence monitor device (1). (6a) is the completion judgment signal of the first step. , is output from the sequencer (2) to the sequence monitor device (1). (5b) is a control signal corresponding to the control of the second step, which is output from the sequencer (2).
The signal is output from the plant (3) and the sequence monitor device (1). (4C) is a response signal from the plant (31) 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, and the sequencer (2)
is output to the sequence monitor device (1).

Next, (8a) and (8b) are mechanisms for determining the start of the first and second steps, respectively, and (9a) and (9b)
are output devices, (10a) and (10b) are determination devices, (11a) and (11b) are timers, (12a).

(12b) is the respective timer (11a), (11b)
Error signal output from (131 is the processing device, (to)
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 (9a), (9b), judgment device (10a), (
10b), the processing device (131), the 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 mechanisms that output control signals (5a) and (5b) according to the eleventh and second steps;
(10a), (10b) are response signals (4b), (4c)
This is a mechanism that determines the completion of the relevant step by inputting the following information.

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) outputs the judgment result of (8a). Initially, the control signal (5a) is output to the plant (3) and the sequence monitor device (1).Plant (3)
operates according to the control signal (5a), and as a result of its operation,
A response signal (4b) is output. 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 input 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). Signal (6a) also serves as the start condition for the second step! J, (8b, l), a 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) is input to the timer (lla), the timer (11a) starts counting time, and when the signal (6a) is input, it stops counting the time. The signal (6a) is the timer (
When the signal (ITo) is input, the timer (llb) starts counting time, and when the signal (6b) is input, the timer (llb) stops counting.

Error signals (12a) and (12b) are output when the time from the start to the stop of time measurement exceeds a predetermined time.

Since a table (referred to as a test signal table) indicating the names of signals to be tested and their signal states corresponding to each step is stored in advance in the storage device α→, error signals (12a) and (12b) are stored in advance. ) is input to the processing device (1st stage), the processing device f131 reads the inspection signal table of the step corresponding to the error signal from the storage device (to), and reads this from the currently input signal (5aL (4b
), ('5b), and (40) to determine the cause of the output of the error signal, output it as a monitoring result signal (7), and display the step number where the sequence abnormality occurred and the sequence abnormality. The cause of the problem can be communicated to the operator or external equipment.

Since the conventional sequence monitor device is configured as described above, the timers (lla) and (llb) have a monitoring setting time set in advance, and this monitoring setting time varies depending on the type of sequence control and its type. An appropriate time must be selected for each step, and if this selection is incorrect, an error signal (12a), (12b) will be generated.
or conversely, output the c error signal (12a), (12b)
The result is that the error signal is not output even after the time when it should be output has elapsed. Therefore, until the characteristics of the plant (31) are known, it is not possible to set the monitoring setting time to the timers (lla) and (llb), and there is a drawback that the sequence monitor device cannot be completed.

[Summary of the invention]

The purpose of the present invention is to eliminate the above-mentioned deficiencies 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 newly connected to a sequencer, execute each step of sequence control multiple times in learning operation mode, measure and store the time required from the start to completion of each step for each of the multiple executions. ,
Set the monitoring setting time determined from the average value and standard deviation value of the memorized required time to the corresponding timer, and after the setting to this timer is completed, return to the normal monitor operation mode and start the sequence. This allows control to be monitored.

Therefore, according to the present invention, it is possible to provide an entire adaptive sequence monitor device that can automatically adjust the monitoring setting time to be set in the timer.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 3 is a block diagram showing one embodiment of the present invention, in which the same reference numerals as in FIG. 2 indicate the same or corresponding parts, αQ is the sequence monitor device of the present invention, and α is the operation mode designation signal; Q81 is a learning mode control device, (I9 is a detection device, (20a) and (20b) are input switches to the detection device a9, respectively, (21) is an output switch, (22a)
.

(22b) is a reset signal, (23a)-(23b) are input switches related to the second step of Oni 1, respectively;
(24a) and (24b) are the first . Computer devices (25a) and (25b) related to the second step are switches that are closed during the learning operation mode and open during the normal monitor operation mode, and (26a) and (26b) are the calculation devices (24a), respectively.

The register corresponding to (24b) and (27) are time value signals.

When the sequence monitor device OQ is newly connected to the sequencer (2) and the plant as shown in Fig. 1, the learning operation mode is specified by the operation mode designation signal (1η,
The learning mode control device is a switch (20a).

(20b), (25a), (25b) are closed and the switch (2υ is opened. Also, when specifying the first learning operation mode, reset signals (22a) and (22b) are output and the register (26aJ , (26b) are deleted.

In this learning operation mode, sequence control is repeated a plurality of times (hereinafter referred to as N times).

When the start condition signal (4a) of the first step is input, the detection device #01 starts measuring time, and stops the time measurement in response to the completion judgment signal (6a) of the first step.
A time value signal tk representing the time measurement result (the suffix indicates the number of repetitions of sequence control) is input to the calculation device (24 &). Computing device (24a
) calculates the average value Tk of the time value signal using the data stored in the register (26a) and the newly inputted data tk.
Then, the root mean square value hJ of the time value signal is calculated, and the calculation result is stored in the register (26a) again.

k-i s 2 =-T2+-t...(21 k k-1k k , and the values of k-1, Tk-□, and Tk-□ are stored in the register (26a) (k=1 , these values are all 0), and after the calculations of the expressions il+ and 12+ are completed -2, the values of k, T, and Tk are stored in the register (26a).

In this way, when k=N (there is no need to set a specific value for N, any value above a certain level is sufficient)
The input of the signal (27) to the calculation device (24a) is stopped and the calculation is performed (however, α is a predetermined number, which is determined according to the degree of dispersion of the completion time of the plant operation), and T
Set u to the timer (11a).

switch (23b), calculation device (24b), register (
26b), the numerical value to be set in the timer (llb) is similarly calculated and set.

In this way, the full length of the learning driving mode and the timer (ll &
), (llb) are set in accordance with the new sequence control, the device can be operated in the normal operating mode 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,
The present invention can be applied to any number of steps by providing a set of timers, calculation devices, and registers corresponding to the number of steps.

1. In the above embodiment, the completion of the first step is automatically followed by the second step.
In the case of an automatic sequence in which a step is started, a semi-automatic sequence in which an operator instructs the start of each step can be easily handled by inputting the start signal and completion signal separately to the sequence monitor device.

Furthermore, although the above example shows the calculation method that is most suitable when the statistical distribution of step completion times is a normal distribution, it is also shown in mathematical statistics that the step completion times follow an exponential distribution. The optimal calculation method can be determined by selecting the parameter estimation method.

〔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.

Furthermore, the sequence side cutting program is often changed in accordance with the actual plant, and the apparatus of the present invention can easily accommodate 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]

FIG. 1 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...Sequencer, +31-...Plant, (
11a), (11b)... timer, αυ...
・Storage device, α→...sequence monitor device, Q8)
...Learning mode control device, (19...detection device, (23a), (23b)...input switch, (2
4a). (24b) ... Calculator, (26a), (2
6b) = each register. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Makoto Kuzuno - Procedural amendment (voluntary) 20 Name of the invention Sequence monitor device 3, relationship with the person making the amendment Patent applicant address 2-3 Sara-chome, Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Co., Ltd. Representative: Katayuni Hachibu 4, Agent address: 5, Mitsubishi Electric Co., Ltd., 2-3 Marunouchi Sara-chome, Chiyoda-ku, Tokyo, Subject of amendment ■ Detailed description of the invention in the specification ( 21 Brief explanation of drawings column 6 of the specification, contents of amendment (1) Page 4, line 3 of the specification “Sequence monitor device”
The text has been corrected to read "sequence monitor device (1)." (2) On page 0 of the same book, line 6, “number of drops” is replaced with “number of times.”
I am corrected. (31 Petty Officer, page 13, line 20, ``calculator'' is corrected to ``calculating device.'': Above t2)

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 that fully controls switching from a normal monitor operation mode to a learning operation mode; a detection device configured to measure the time required for each step in accordance with a signal indicating the start point of each step and a signal indicating the corresponding completion point inputted from the sequencer and the plant in the mode, and output it as a time value signal; means for repeatedly performing the same sequence control a plurality of times in the learning operation mode, and then setting each numerical value determined based on the statistics of the time value signal in each step as the monitoring setting time of the timer corresponding to the step; A sequence monitor device comprising means for executing operation in a normal monitor operation mode after the monitoring setting time is newly set or changed in the learning operation mode.