Troubleshooting The Power Supply And Remote I/O Station Modules; Troubleshooting The Remote I/O Station Module - Hitachi HSC-2100 Hardware Manual

6 MAINTENANCE

6.2.1 Troubleshooting the power supply and remote I/O station modules

Indicator
condition
Improper power cable connection
Power cable breakage
POWER ON
Power supply abnormality (in
LED not lit
voltage or waveform)
None of the above

6.2.2 Troubleshooting the remote I/O station module

Indicator
condition
LPU or CPU module abnormality
Ladder program running in SIMU
RUN mode
Station no. setting error
Power supply module operation
abnormality
RI/O LED
not lit
Remote I/O
cable
abnormality
Power supply or remote I/O
station module mounted in wrong
slot
None of the above
Check item
Check item
Cable breakage
Cable length too
long
Cable
connection
incomplete
Terminating-
resistor
connection
incorrect
Remedial action
Connect the power cable properly.
Replace the power cable with a new one.
Supply normal power to the module.
Replace the power supply module with a new
one.
Remedial action
Refer to the instruction manual on the LPU or
CPU module and solve the problem.
Change the operation mode to STOP or
RUN.
Refer to the instruction manual on the LPU or
CPU module and set the station no. correctly.
Troubleshoot the power supply module
according to the instructions given in
Subsection 6.2.1.
Replace the remote I/O cable with a new one.
Re-wire the remote I/O cable within the
prescribed length limit, which is specified in
the instruction manual on the LPU or CPU
module.
Refer to the instruction manual on the LPU or
CPU module and connect the remote I/O
cable correctly.
Refer to the instruction manual on the LPU or
CPU module and connect the terminating
resistor correctly.
Mount the module in the right slot.
Replace the remote I/O station module with a
new one.
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