Table 9-15 Troubleshooting A Communications Failure - Honeywell UDC 3300 Product Manual

Procedure #8
260
Table 9-15 explains how to troubleshoot a Communications failure.
Table 9-15 Troubleshooting a Communications Failure
Step What to do
1
Check the field wiring and
termination resistor.
2 Make sure the Communications
Printed Wiring Board is installed
properly in the controller.
3 Determine if the Communications
board is faulty by running a LOCAL
LOOPBACK TEST.
If the test fails, replace the board.
UDC 3300 Controller Product Manual
How to do it
Depending on the protocol used, refer
to the proper communications manual
installation section.
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.
Run the Local Loopback Test.
Press [SET UP] until you see:
Upper Display
SET UP
Lower Display
COM
Press [FUNCTION] until you see:
Upper Display
DISABL
Lower Display
LOOPBACK
Press or , you will see:
Upper Display
ENABLE
Lower Display
LOOPBACK
The test will run until the operator
disables it here.
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