The internal disturbances of the PLC system are 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 their influence on the imitation circuit, the interaction between imitation and logic, and the mutual mismatch between components. How to effectively deal with the internal annoyance of PLC long-distance module system?
The tolerance of logical voltage disturbance in PLC operation is low, and the distribution disturbance of logical ground potential minimally affects the logic operation and data storage of PLC, resulting in data disorder, program running or crashing. Imitation of the distribution of ground potential will lead to the decrease of measurement accuracy, resulting in severe distortion and malfunction of signal measurement and control. PLC module manufacturers generally carry out electromagnetic compatibility design content inside the system, which is more messy than **, as the application part can not be changed, but there is no need to think too much, but how to better and more briefly deal with the troubles of PLC system?
1. Correct grounding, which can not only press the influence of electromagnetic disturbances, but also press the equipment to announce the disturbances;
2. Choose equipment with good blocking function, excellent power supply, power line and signal line routing should be more reasonable, etc., and press the common grounding, inverter, solenoid valve and unknown pulse to disturb the equipment; Together with the function of voltage limiting and frontal current for subordinate equipment, it is the faithful protection of transmitters, appearances, inverters, solenoid valves, PLC/DCS input and output and communication interfaces.
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