The internal disturbance of the PLC system is mainly caused by the mutual electromagnetic radiation between the components and circuits inside the system, such as the mutual radiation of logic circuits and their influence on the imitation circuit, the interaction between the imitation ground and the logical ground and the mutual mismatch between components. How to effectively deal with the internal disturbance problem of PLC long-distance module system?
The logic voltage disturbance tolerance of PLC operation is low, and the distribution disturbance of logical ground potential simply affects the logic operation and data storage of PLC, resulting in data disorder, program flight or crash. Mimicking the distribution of ground potential will lead to a decrease in measurement accuracy, resulting in severe distortion and misoperation of signal measurement and control. The content of the electromagnetic compatibility design of the PLC module manufacturer is generally complex and cannot be changed as a part of the use, so there is no need to think too much, but how can we better and more simply deal with the disturbance of the PLC system?
1. Correct grounding can not only suppress the influence of electromagnetic disturbance, but also inhibit the equipment from announcing disturbance;
2. Select equipment with better isolation function, excellent power supply, power line and signal line routing should be more reasonable, etc., to suppress the disturbance of public grounding, frequency converter, solenoid valve and unknown pulse to the equipment; At the same time, it has the function of voltage limiting and frontal current for subordinate equipment, which is the loyal protection of transmitters, appearances, inverters, solenoid valves, PLC/DCS input and output and communication interfaces.
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