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programmable logic controller

A programming logic and controller technology, applied in program control, program control in sequence/logic controller, electrical program control, etc., can solve the problem of increased communication load and achieve the effect of efficient data transmission

Active Publication Date: 2017-07-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a system that displays the status of data, transmission of device data whose value does not change is unnecessary, which may cause an increase in communication load

Method used

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Experimental program
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Embodiment approach

[0020] figure 1 It is a figure which shows the structure of PLC concerning embodiment of this invention. The control system 100 has a PLC (Programmable Logic Controller) 10 , a PC (Personal Computer) 20 , and a controlled device 40 . The PLC 10 is connected to a device (display device) capable of displaying data, such as a PC 20 , via a communication cable 30 . In addition, the device connected to the PLC 10 is not limited to the PC 20, and may be other devices.

[0021] In addition, the PLC 10 is connected to a controlled device 40 such as an industrial machine via a communication cable 31 . The PLC 10 is a device that controls the controlled device 40 and stores data related to the controlled device 40 (hereinafter referred to as device data) that changes in accordance with the operation (state) of the controlled device 40 . The PLC 10 sends the device data to the PC 20 in response to the request from the PC 20 . In the present embodiment, the PLC 10 is a device configur...

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Abstract

A PLC compares previously acquired device data with currently acquired device data when collecting device data on a control target device over three or more times within one polling time, and stores changed device data as changed data when they are different from each other. When transmitting the changed data to a PC in each polling, the PLC compares the changed data with collected device data. When the total amount of changed data is equal to or larger than the total amount of collected device data, the PLC restores collected device data by using the changed data and transmits the restored device data to the PC, and, when the total amount of changed data is smaller than the total amount of collected device data, the PLC transmits the changed data to the PC.

Description

technical field [0001] The present invention relates to a programmable logic controller that transmits device data stored inside the programmable logic controller to a display device. Background technique [0002] A PLC (programmable logic controller) that controls a controlled device (industrial machine, etc.) used in a factory or the like has a device memory that temporarily stores each device data related to the controlled device. The above-mentioned PLC (sequencer) reads / writes data of each device according to a sequencer program which is a program created by the user, thereby controlling the controlled device. Generally, in a system using this PLC, the value of each device data is transmitted to a PC (personal computer) side, and the change and status of each device are displayed on a display device such as the PC. [0003] Currently, in the above-mentioned system using PLC, when a device data transmission request is issued from the PC to the PLC, all the device data a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/05
CPCG05B19/05G05B2219/14008
Inventor 吉川贵支
Owner MITSUBISHI ELECTRIC CORP