ROC364 Instruction Manual
3-21
Input and Output Modules
Rev Jun/05
HART MODULE
C
DOC0295A
B
A
+
-
HART DEVICE 1
ROC-POWERED
+T
I
LIMIT
-
+
-
+
MUX
MODEM
ROC-POWERED
HART DEVICE 2
ROC-POWERED
HART DEVICE 5
HART DEVICE
ROC-POWERED
-
+
CHANNEL 1, MULTI-DROP MODE
CHANNEL 2, POINT-TO-POINT MODE
Figure 3-26. Field Wiring for a HART Interface Module
3.5 Troubleshooting and Repair
Use troubleshooting and repair to identify and replace faulty modules. Faulty modules must be returned
to your local sales representative for repair or replacement.
If an I/O point does not function correctly, first determine if the problem is with the field device or the
I/O module as follows:
Failure to exercise proper electrostatic discharge precautions (such as wearing a grounded wrist
strap) may reset the processor or damage electronic components, resulting in interrupted
operations.
1.
Isolate the field device from the ROC by disconnecting it at the I/O module terminal block.
2.
Connect the ROC to a computer running ROCLINK configuration software.
3.
Perform the appropriate test procedure described in the following sections.
A module suspected of being faulty should be checked for a short circuit between its input or output
terminals and the ground screw. If a terminal not directly connected to ground reads zero (0) when
measured with an ohmmeter, the module is defective and must be replaced.