8–8
Starting Up Your Control System
Publication
1747-6.2
Output Troubleshooting Steps
1. Make sure the processor is in the Run mode.
2. Verify proper addressing of the output test rung from the previous
page.
3. By using a programming device, locate the output data file and
bit data file. See if the status of the associated bits between these
files match.
4. If the status of the bits match in step 3, and if the status of the
output LED match the status of the bits, but the status of the
output device is different, continue to step 5.
If the output status LED does not match associated bit status,
check status file S:11 and S:12 I/O slot enables. Bits S:11/0
through S:11/15 and S:12/0 through S:12/14 should all be 1
enabling all I/O slots for the modular system.
If the output slot enable was verified, then try exchanging the
output module under test with identical hardware and retest. If
the new hardware works properly, replace the original.
5. Verify proper output voltage at the output terminal and then at the
output device.
6. De-energize output circuit and check all output circuit
terminations and wire routes.
7. If proper output voltage does not exist at output device and power
source is adequate to drive output device, test the output device
and replace if necessary.
For more information on output troubleshooting, see page 10–28.
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