TROUBLESHOOTING
ERROR INDICATIONS AND CORRECTIVE ACTION
5 - 2
WBPEEUI240754A0
®
Control Module Errors
The control module performs status checks on the DSO mod-
ule. An error will appear in the report function of an operator
interface. Refer to the Product Instruction for the operator
interface being used (Table
) for an explanation of these
reports.
Function Code (FC) 83 output block N in the control module
configuration is the DSO status flag (logic 0=good; logic
1=bad). You can use an operator interface to monitor this
block. If the status flag is a logic 1, check the front panel mod-
ule status LEDs and the operator interface report function to
determine corrective actions.
NOTE: If FC 83 specification S3 is set to 0, the control module will
trip when the DSO module fails. Changing specification S3 to a 1
allows the control module to continue to operate if any DSO error
condition exists.
The address set on address switch S1 and in the control mod-
ule configuration must be the same. The control module gener-
ates a
MISSING SLAVE MODULE
if they do not match. Verify
that the address set on switch S1 is the same as the address in
FC 83 specification S1. If not:
1. Drive the module’s relays to a non-active status.
2. Disconnect the relay power supply (+24 VDC).
3. Remove the module and change the setting of address
switch S1 to correspond with the control module configuration
(refer to
in Section 3 for the procedures to set
an address and to install a digital output module).
Red OFF/
Green OFF
(continued)
Digital output module
not enabled
Control module configuration
is not correct
Verify FC 83 is in control module
configuration
No power to digital
output module
Module not completely
inserted in MMU
Verify module is completely
inserted in MMU; faceplate flush
with MMU and captive retaining
screws latched
Red ON/
Green OFF
Bus fault timer error
(
time-out)
I/O expander bus clock failure Check control module for proper
operation
Dipshunt not installed
between control module and
digital output module
Verify dipshunt is installed in the I/
O expander bus socket on the
MMU backplane between control
module and digital output module
Table 5-1. Status LED Indications and Corrective Actions
(continued)
LED State
Indication
Probable Cause
Corrective Action
CAUTION
Disable the output signals before removing the module to pre-
vent damage to the edge connector pins.
