Hitachi NJI-350B User Manual

Page 284

Chapter 13 Troubleshooting

13-9

(c)

Operation stopped (RUN stopped)
During normal operation, the CPU suddenly stops (the RUN LED turns off).

YES

Check the power supply

• Instantaneous power failure

occurs

• Power is shut off on the

expansion unit side

Contact our service department
if a fatal error occurs frequently

Turn the power off and turn it
back on

Check the program

Check parameters

Check I/O assignment

• Parameter settings

• Program congestion

• Check I/O assignment

• Duplicate use of the timer

counter

• Retransfer of program

• Connection with the expansion

connector

POWER LED is lit

(Power supply is

normal)

Fatal CPU error

Self-diagnostic error code