JP5295061B2 - Programmable controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a programmable controller capable of reducing a load for generating a sequence program. <P>SOLUTION: Sequence control of controlled devices is performed according to a sequence program. An operation code unified for each controlled device is assigned to an operation content targeted by the sequence control of the controlled devices. The sequence program is edited through input of the operation code to a device table 3 stored in a memory. A control program corresponding to the operation code sequentially read from the device table 3 is called and executed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a programmable controller that performs sequence control of controlled devices.

  A programmable controller (hereinafter referred to as “PLC” as appropriate) performs drive control of electric loads such as various actuators and display devices in accordance with the operation state of input signals such as operation switches and various sensors and a sequence program. The PLC operates according to a sequence program described by the user. For example, Patent Document 1 proposes a technique of a control device configured to comprehensively control a plurality of controlled devices.

JP 2006-99639 A

  When various devices connected to the PLC are subjected to sequence control, a sequence program is created by describing a control program corresponding to each device in the order of operation. When a sequence program is edited, a sequence program in which a control program is described in accordance with the order of operations is created each time. This causes a problem that the load for creating the sequence program may increase.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a programmable controller that can reduce the load of creating a sequence program.

  In order to solve the above-described problems and achieve the object, the present invention performs sequence control of a controlled device in accordance with a sequence program, and the operation contents to be subjected to the sequence control of the controlled device include each controlled device. A unified operation code is given to the control device, and the sequence program is edited by inputting the operation code to the device table stored in the memory, and the operation code sequentially read from the device table is added to the operation code. A corresponding control program is called and executed.

  According to the present invention, there is an effect that it is possible to reduce the sequence program creation load in the programmable controller.

FIG. 1 is a diagram illustrating a block configuration of a control system including a PLC according to an embodiment. FIG. 2 is a diagram illustrating an input example of an operation code and attached information to the device table.

  Below, based on drawing, an embodiment of a programmable controller concerning the present invention is described in detail.

Embodiment.
FIG. 1 is a diagram showing a block configuration of a control system including a PLC 1 according to an embodiment of the present invention. This control system includes a PLC 1, a device A, a device B, and a device C connected to the PLC 1, and the touch panel 2. The devices A, B, and C are controlled devices that are sequence-controlled by the PLC 1. For example, the device A is an industrial robot that performs work at a production site or the like. For example, the devices B and C are processing machines for obtaining processed products by processing materials. The PLC 1 performs sequence control on the devices A, B, and C according to the sequence program. Here, the sequence program is a program for executing a series of operations of the controlled device. The touch panel 2 functions as an input unit for inputting various parameters to the PLC 1.

  The device table 3 is stored in the memory of the PLC 1. The touch panel 2 accepts input of an operation code to the device table 3 and input of attached information. The device table 3 stores operation codes and attached information input from the touch panel 2. The operation code is a code given to the operation contents of the devices A, B, and C that are targets of sequence control by the PLC 1. The sequence program is edited by inputting an operation code to the device table 3 through the touch panel 2. The attached information is information attached to the operation content of the controlled device. The device table 3 holds attached information in association with the operation code.

  The code analysis / control execution program 4 reads an operation code from the device table 3 and sequentially analyzes the read operation code. The code analysis / control execution program 4 is a program for calling a control program corresponding to the operation code, and is stored in the memory of the PLC 1. The control program is a program for executing the operation content specified by the operation code. The PLC 1 controls the device A by executing the control program 5A called for the device A. The PLC 1 controls the device B by executing the control program 5B called for the device B. The PLC 1 controls the device C by executing the control program 5C called for the device C. The called control programs 5A, 5B, and 5C are temporarily stored in the memory as data to be input / output of instructions.

  FIG. 2 is a diagram illustrating an example of operation codes and attached information input to the device table 3. Device A, device B, and device C are provided with operation codes for each operation content that is subject to sequence control by PLC 1. For example, an operation code starting from “1” is given to the operation content of the device A. Assume that operation codes “1”, “2”, and “3” are assigned to “operation 1”, “operation 2”, and “operation 3” of the device A, respectively.

  For example, an operation code starting from “100” is given to the operation content of the device B. It is assumed that operation codes “100”, “101”, and “102” are assigned to “processing A”, “processing B”, and “processing C” of the apparatus B, respectively. For example, an operation code starting from “200” is given to the operation content of the device C. It is assumed that operation codes “200”, “201”, and “202” are assigned to “machining α”, “machining β”, and “machining γ” of the apparatus C, respectively. The operation codes are provided in a unified manner so that the operation contents of the devices A, B, and C do not overlap. The devices A, B, and C are configured to be able to set a unified operation code for the operation content that is subject to sequence control by the PLC 1.

  As the accessory information for the device A, for example, it is possible to set speed data related to the speed of the arm and hand data related to the gripping operation of the hand. As ancillary information for the devices B and C, for example, it is assumed that recipe data regarding processing conditions can be set. In addition to the data described in the present embodiment, any data related to the operation of the controlled device may be set as the attached information.

  For example, it is assumed that the user inputs operation codes “3”, “201”, “2”, “100”, “1” in order from the first line in the code input field of the touch panel 2. The input operation code is stored in the operation code string 10 of the device table 3. Further, the user inputs attached information to be attached to the operation content of each operation code in the attached information input field of the touch panel 2. The input accessory information is stored in the accessory information column 11 of the device table 3.

  When the code analysis / control execution program 4 (see FIG. 1) reads the operation code “3” stored in the first row of the device table 3, the operation 3 of the device A corresponding to the operation code “3” is executed. And the control program reflecting the speed data and hand data, which are attached information, is executed. The control program is similarly called and executed for the second and subsequent lines of the device table 3. As described above, the sequence program is edited by inputting the operation code to the device table 3.

  The controlled device connected to the PLC 1 may be any device that can be connected to the PLC 1 and can be widely applied regardless of the type of device, interface specifications, and manufacturer. In addition to the case where the controlled device is directly connected to the PLC 1, the controlled device can be communicated via a communication unit connected to the PCL 1 by a bus, or operated by a CPU unit connected to the PLC 1 by a bus. It may be made to do.

  According to the present embodiment, it is possible to create a sequence program independent of the device type, interface specification, and manufacturer by enabling the PLC 1 to be controlled to edit the sequence program by inputting an operation code. Become. By assigning an operation code to the operation content of the controlled device in advance, the user can edit the sequence program by inputting the operation code according to the operation sequence. For this reason, it is possible to facilitate the editing of the sequence program as compared with the case where the control program for each controlled device is written according to the operation sequence. As a result, the sequence program creation load can be reduced.

  Note that the number of controlled devices connected to the PLC 1 may be any number, and may be one or a plurality of devices. The effect of enabling the sequence program creation load to be reduced can be obtained not only when there are a plurality of controlled devices but also when there is a single device.

  The method for inputting the operation code and the attached information to the device table 3 is not limited to the case of using the touch panel 2, and any conventionally known input means such as a keyboard may be used. Further, the accessory information is not limited to being input together with the operation code by the user, and may be set in advance. The association between the operation content of the controlled device and the operation code may be performed by either the provider of the control system including the PLC 1 or the user.

  As described above, the programmable controller according to the present invention is useful when performing sequence control of a plurality of controlled devices.

1 PLC
2 Touch panel 3 Device table 4 Code analysis / control execution program 5A, 5B, 5C Control program

Claims (1)

A programmable controller that performs sequence control of a controlled device according to a sequence program ,
A memory storing a device table for editing the sequence program;
Input means for receiving input of data to the device table,
The operation content that is the target of the sequence control of the controlled device is given a centralized operation code for each controlled device,
The device table edits the sequence program for executing a series of operations of the controlled devices according to the input order of the operation codes when the operation codes are input through the input unit, and the operations Attached information associated with the content is held in association with the operation code,
A programmable controller, wherein a control program corresponding to the operation code sequentially read from the device table is called and executed.

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