Interference issues

2010-10-19View Original

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Reasons why the PLC cannot receive signals from field instruments.

Reply #22010-10-19

There are many reasons: wiring issues (loose connections, open circuits, short circuits, wrong wiring), programming problems (such as errors in the statements used in the PLC program to read external input signals), signal problems (the signal type does not match the channels of the PLC receiving module), and equipment problems (such as damaged channels or input points in the PLC module, or communication failures with field instruments).

Reply #32010-10-21

This situation is most likely due to wiring or programming issues; take a good look at it

Reply #42010-10-21

There are too many possibilities; in most cases, it’s a wiring issue.

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Interference issues

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