Answer / s. kanniyappan

The Main problem occurs in DCS/PLC hardware are

1) Channel failure
2) I/O cord failure

Answer / rajendra shaha

1)channel failure
2)i/o card fail
3)AI AO channel weak
$)processor card problem
5)bus coupler card problem
6)bulk power supply(BPS)fail
7)DSSR FAIL
8)COMMUNICATION FAIL

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