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System data fluctuations

2009-02-05View Original

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The current signal data of the OPTO-22 PLC system shows fluctuations, whereas there are no such fluctuations in the actual field data. What is the reason?
Reply #22009-02-05
Electrical field interference – the wiring route should be checked
Reply #32009-02-08
Check the shielding and grounding of the signal cable; if there are issues with the wiring (such as too short a distance between it and low-voltage electrical cables), poor grounding can result in a voltage of several dozen volts across the shielding wire relative to ground. This voltage level changes as the electrical equipment operates, thereby interfering with the current signal.

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Translated at 2026-07-28 06:06:02

Original: https://bbs.hcbbs.com/thread-383097-1-1.html

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