It is mainly caused by the mutual electromagnetic radiation between the internal components and circuits of the system, such as the mutual radiation of logic circuits and its influence on the analog circuit, the mutual influence of the analog ground and the logic ground, and the mismatch between the components. This is the content of the electromagnetic compatibility design inside the system by the PLC manufacturer, which is more complicated and cannot be changed as an application department.
Anti-interference design of PLC control system engineering application
In order to ensure that the system can avoid or reduce internal and external electromagnetic interference in the industrial electromagnetic environment, three suppression measures must be taken from the design stage: suppress the interference source; cut off or attenuate the propagation path of electromagnetic interference; improve the anti-interference ability of the device and system . These three points are the basic principles of suppressing electromagnetic interference.
The anti-interference of PLC control system is a systematic project, which requires the manufacturing unit to design and produce products with strong anti-interference ability, and depends on the user department to fully consider in engineering design, installation, construction and operation and maintenance, and to carry out according to the situation. Comprehensive design can ensure the electromagnetic compatibility and operational reliability of the system. When carrying out the anti-interference design of a specific project, the following two aspects should be mainly considered.
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