Troubleshoot The System; Verify The Module Hardware - Allen-Bradley AB QUALITY ControlLogix 1756 Series User Manual

Verify the module hardware

(page 11-1).
Verify the communication links
(page 11-2).
Verify the routing tables
(page 11-2).
If all else fails...
(page 11-2).
Verify the Module Hardware

Troubleshoot the System

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Check each module's hardware to ensure it is what you expect. Specifically,
verify the following:
Are they all powered?
Are the switch settings correct? Was the module correctly
oriented when you set the switches so you didn't mix up any
left to right ordering?
Are the "OK" LEDs all green (blinking or solid)? Do the
displays indicate any errors?
Are they in the correct slot location? (ControlLogix slots are
numbered from the left starting with zero.)
Is the wiring correct? Are the channel indicators correct?
Chapter
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Publication 1756-6.5.13 - September 1999
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