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Chapter 10 Maintenance
XBC E-Type Main Unit
10-4
Ver. 1
10.2.3 Initial Troubleshooting Procedures
The following sequence can shorten the time needed for troubleshooting a system failure. This sequence will
vary depending on the system and equipment.
1. Visual checks
a. Equipment operating condition
i. Verify equipment is in a safe state before making visual inspection. Personal
injury can occur if portions of the equipment is still energized and active.
ii. Observe all necessary and mandated precautions and safety procedures.
b. Power
i. Verify incoming power to the equipment, including circuit protection. Make sure
operating voltage is available at the incoming power terminals on the PLC and
any associated power sources (DC power supplies, control transformers, and
etc.)
c. Verify the condition and operation of all peripheral field devices and their wiring back to
the PLC
d. Observe the state of all LED indicators on the PLC and associated modules for proper
status.
At this point the problem may be narrowed down to a PLC system issue to be further diagnosed
and resolved.
2. Cycle the PLC modes
a. Cycle the PLC Modes from RUN to STOP and STOP to RUN. Observe the overall
equipment operation and PLC indicator LED’s.
3. Narrow down the area(s) to troubleshoot
a. Incoming power
b. PLC and expansion/specialty modules
c. Equipment field devices
d. Peripheral devices using communications to the PLC system
e. PLC Program
i. A PLC program typically either works or does not work. Sometimes a particular
set of conditions on an intermittent basis will cause an unexpected action within
the PLC.
Summary of Contents for XBC-DN10E
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