
1/03 UDC 6300 Process Controller Product Manual 265
8.7 Troubleshooting Procedures, Continued
Procedure #6
Table 8-13 explains how to troubleshoot a DMCS Communications
failure.
Table 8-13 Troubleshooting a DMCS Communications Failure
Step What to do How to do it
1
Check the field wiring and
termination resistor.
Depending on the protocol used,
refer to the proper
communications Manual
Installation Section.
2
Make sure the DMCS
Communications Printed Wiring
Board is installed properly in the
controller.
Withdraw the chassis from the
case and inspect the board. See
the exploded view (Figure 9-1) for
location of the board. Return the
chassis to the case.
3
Determine if the DMCS
Communications board is faulty
by running a
LOCAL LOOPBACK TEST.
If the test fails, replace the
board.
Run the Local Loopback Test.
Press SET UP
until you see:
COM
Lower Display
SET UP
Upper Display
Press FUNC
until you see:
LOOPBACK
Lower Display
DISABL
Upper Display
Press
or
, you will see:
LOOPBACK
Lower Display
ENABLE
Upper Display
ATTENTION
The test will run
until the operator disables it here.
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