JPH0651815A - Abnormality recovering device for sequence controller - Google Patents

Abstract

PURPOSE:To recover abnormality without depending on the judgement of an operator by providing an abnormality recovery part to perform recovery processing based on the information of an operating command numerical value storage part after removing the cause of abnormality for a sequence temporarily stopped by the abnormality detection of an equipment. CONSTITUTION:Assuming that a counter 12 is temporarily stopped by the abnormality detection when an abnormal signal is turned on by a numerical value '10' of the counter 12, when such an abnormal state is generated, the operator removes the cause of abnormality first of all. Afterwards, automatic recovery is commanded by turning on a recovery push button. An abnormality recovery part 30 detects the minimum value of an operating command numerical value stored in an operating command numerical value storage part 20 by using a minimum value detection part 32, forcedly sets the minimum value to the counter 12 of a time schedule control part 10 and starts the addition of the counter again. As a result, an opening command of an equipment 4 is applied at a count value '6', next, the closing command of an equipment 1 is applied at a count value '9' and the sequence is continued.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality recovery device for a sequence control device.

[0002]

2. Description of the Related Art A sequence controller represented by a programmable controller inputs operation state signals of a plurality of devices, performs a sequence process based on these signals, and gives an operation command output to the plurality of devices. When the abnormal operation state of the device is input or when the abnormal state is determined in the sequence processing, the abnormality information is output, and the operator can recognize the abnormality on the operation console or the CRT display. The operator who recognizes the abnormal state removes the cause of the abnormal state, operates the various devices independently until the sequence process can operate normally, and then shifts the operation command of the device to the sequence process.

By the way, as a method of recovering an abnormality of a sequence control device, Japanese Patent Laid-Open No. 2-96201 discloses in advance a mode at the time of occurrence of an abnormality and a recovery sequence for the abnormality, and when the abnormality occurs, the stored recovery sequence is used as a basis. It has been proposed to try to operate the device.

[0004]

However, in the prior art, since the operator performs the recovery operation, it depends largely on the experience and subjectivity of the operator, and the optimum recovery operation cannot always be performed, and the device down time is prolonged, There are problems that power loss often occurs, and that recovery operations cannot be properly performed by an inexperienced operator. On the other hand, in the one disclosed in the above publication, a recovery sequence for recovering an abnormality must be stored in advance, and there is a possibility that all the recovery sequences cannot be stored in the sequence control device. Moreover, since the process of the recovery sequence is complicated, there is a possibility that the operation may be performed in an incorrect recovery sequence. Therefore, the problem to be solved by the present invention is to provide a device for performing an abnormal recovery automatically after the operator removes the cause of the abnormality, without depending on the operation of the operator, and without a storage unit for the recovery sequence. Especially.

[0005]

In order to solve the above problems, the present invention provides an input unit for detecting the operating states of a plurality of devices, and a sequence processing based on the operating state signals of the devices from the input units. In a sequence control device having a sequence control unit that performs the operation and an output unit that gives an operation command to a plurality of devices based on the result of the sequence control unit, a time to give an operation command to the device with an operation command value preset by a time schedule. The schedule control unit, the operation command numerical value storage unit that stores the operation command numerical value when the device operation command is given from the same time schedule control unit, and the sequence temporarily stopped due to the device abnormality detection It is characterized in that an abnormality recovery unit is provided for performing recovery processing based on information in the operation command numerical value storage unit.

[0006]

By the above means, the recovery sequence after the operator removes the cause of the abnormality is automatically performed only by the recovery entry operation, without depending on the operator's judgment.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 10 is a time schedule control unit, 20 is an operation command numerical value storage unit, and 30 is an abnormality recovery unit. To the time schedule control unit 10, operation completion signals from a plurality of devices, in this example, devices 1 to 4, are input, and device operation commands for performing preset sequence processing based on the operation state signals are input. Output. For example, as shown in the time schedule control time chart of FIG. 2, the devices 1 to 4 perform the opening / closing operation, and the operation command numerical values in the time schedule control unit are that the device 1 is open 1 / close 9 and the device 2 is open 11.・ Closed 19, device 3 is open 21, closed 3
4, the device 4 is set to open 6 and closed 19, and the command of the corresponding device is given when the command counters match.

Next, the operation of the embodiment of FIG. 1 will be described with reference to the flow chart of FIG. The operation command numerical value when the operation command of the device is given from the time schedule control unit 10 is stored in the operation command numerical value storage unit 20, and the stored numerical value is cleared when the operation of the corresponding device is completed (FIG. 3).
Steps 100-120). In FIG. 1, the abnormal signal is turned on by the numerical value 10 of the counter 12, and the device 1 is in the state where it has reached the open end and the close command has been given but not the closed end.
Indicates that the open command has been given but has not been reached to the open end. At this time, the counter 12 is temporarily stopped due to the abnormality detection. When the above-mentioned abnormal state occurs (step 130 in FIG. 3), the operator first removes the cause of the abnormality (step 140). After that, the recovery input push button is turned on, and the automatic recovery is instructed (step 150 of the same). Abnormality recovery section 3 when the recovery input push button is turned on
0 detects the minimum value of the motion command numerical values stored in the motion command numerical value storage unit 20 by the minimum value detection unit 32 (step 160), and forcibly sets the minimum value to the counter 12 of the time schedule control unit 10. (The number “6” in FIG. 1) and restarts the counter addition (step 1
70). As a result, the command to open the device 4 is given again with the count value 6, and the command to close the device 1 is given next with the count value 9 to continue the sequence.

[0009]

As described above, according to the present invention, the abnormality recovery of the sequence control device can be performed without the operator's judgment, and the program of the sequence control device can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a time chart of a time schedule according to the embodiment of the present invention.

FIG. 3 is a flowchart of an embodiment of the present invention.

[Explanation of symbols]

10 time schedule control unit, 12 counter, 2
0 operation command numerical value storage unit, 30 abnormality recovery unit, 32 minimum value detection unit

Claims (1)

[Claims] 1. An input unit for detecting the operating states of a plurality of devices, a sequence control unit for performing sequence processing based on the operating state signals of the devices from the input unit, and a plurality of units depending on the result of the sequence control unit. In a sequence control device having an output unit for giving an operation command to the device, a time schedule control unit for giving an operation command of the device with an operation command value preset by a time schedule, and an operation command for the device from the time schedule control unit. The operation command numerical value storage unit that stores the operation command numerical value when given, and the sequence that was temporarily stopped due to the device abnormality detection after removing the cause of the abnormality, perform recovery processing based on the information in the operation command numerical value storage unit. An abnormality recovery device for a sequence control device, which is provided with a section.