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260 UDC 3300 Controller Product Manual 4/00
Procedure #8
Table 9-15 explains how to troubleshoot a Communications failure.
Table 9-15 Troubleshooting a 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 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 10-1) for
location of the board. Return the
chassis to the case.
3
Determine if the 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 [FUNCTION] until you see:
LOOPBACK
Lower Display
DISABL
Upper Display
Press ▲ or ▼, you will see:
LOOPBACK
Lower Display
ENABLE
Upper Display
The test will run until the operator
disables it here.