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Diagnosis method of plc system and its plc system

A diagnosis method and a technology of expansion modules, which are applied in the field of PLC systems, can solve problems such as the inability to monitor PLC basic modules and first expansion modules in real time

Active Publication Date: 2017-10-31
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing PLC diagnosis methods rely on the user to manually start the diagnosis function of the PLC basic module, which cannot monitor the effectiveness of the electrical connection between the PLC basic module and the first expansion module, and the first expansion module and the second expansion module in real time.

Method used

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  • Diagnosis method of plc system and its plc system
  • Diagnosis method of plc system and its plc system
  • Diagnosis method of plc system and its plc system

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Embodiment Construction

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.

[0024] In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.

[0025] In order to make the drawing concise, the parts related to the present invention are only schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked.

[0026] Herein, "a" not only means ...

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Abstract

The invention provides a diagnosis method for a PLC system. A PLC base module periodically sends diagnosis signals to a first expansion module according to a diagnosis period Td, after the first expansion module receives the diagnosis signals, first effective connection signals are sent to the PLC base module, and first relay signals are sent to a second expansion module; after the second expansion module receives the first relay signals, second effective connection signals are sent to the first expansion module; after the first expansion module receives the second effective connection signals, third effective connection signals are sent to the PLC base module. Due to the fact that the functions of the PLC base module are used in the diagnosis method for the PLC system, extra motion detection software of the PLC base module is not needed, a user does not need to conduct programming, and the instantaneity and the usability of the PLC system are improved.

Description

technical field [0001] The present invention relates to a diagnostic method, in particular to a diagnostic method for valid data communication between a programmable logic controller (ProgrammableLogic Controller, PLC for short) and its expansion modules. The invention also relates to a PLC system for carrying out the diagnostic method. Background technique [0002] figure 1 To illustrate the connection relationship between the PLC and its expansion modules, the figure only schematically shows a first expansion module 72 and a second expansion module 74 . As shown in the figure, the PLC basic module 70 is electrically connected to the first expansion module 72 , and the first expansion module 72 is electrically connected to the second expansion module 74 . The PLC basic module can directly communicate with the first expansion module, while the communication between the second expansion module and the PLC basic module needs to be relayed through the first expansion module. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02G05B19/05
CPCG05B23/0213
Inventor 赵柯尹浩刘园园刘妍
Owner SIEMENS AG
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