Rockwell Automation 57C423 Common Memory Module - Manual (Page 21)

5Ć1
5.0 DIAGNOSTICS AND
TROUBLESHOOTING
This section explains how to troubleshoot the Common Memory
module.
5.1 The SYSTEM WATCHDOG" LED is Off
Problem: The green SYSTEM WATCHDOG" LED on a Common
Memory module located in slot 0 is off, and a Processor module in
the rack displays codes 4.0 through 4.6. These error codes mean
that the Common Memory module has failed one of its powerĆup
diagnostics.
Systematically swap out the Common Memory module and the
Processor module(s). Make certain power is off before removing any
module from the rack. After each swap, if the problem is not
corrected, replace the original item before going on to the next item.
If the problem persists, take all of the modules except the Common
Memory module and one Processor module out of the rack. If the
problem is now corrected, another module in the rack is causing the
problem. Replace the remaining modules one at a time until the
problem reappears. If none of these tests reveals the problem, try
replacing the backplane.
5.2 The BAT.OK" LED is Off
Problem: The BAT. OK" LED on the Common Memory module
faceplate is off. The possible causes of this problem are the following:
D the tape covering the battery has not been removed
D the battery is not facing in the proper direction
D the battery is missing
D the battery is malfunctioning
D the power supply is malfunctioning
To correct the problem, first turn off power to the rack. Refer to steps
1Ć3 in section 3.3 for instructions on taking the Common Memory
module out of the rack to inspect the battery. If the tape is still
covering the battery, remove it. If the battery is missing or not facing
in the proper direction, insert the battery with the +" end facing the
+" marking on the battery holder. If none of the above actions
correct the problem, replace the battery.
5.3 Incorrect Data
Problem: The output is either always off, always on, or different than
expected. The possible causes of this error are a module in the
wrong slot, a malfunctioning module, or a programming error. Use
the following procedure to isolate the problem:
Step 1.
Verify that the module is in the correct slot.
Refer to figure 3.1. Verify that the correct number of slots
to the right of the Common Memory module are either