Hitachi HIDIC MICRO-EH Applications Manual page 282

(a) PLC will not start
The CPU OK LED does not turn off even when power is started, nor peripheral units cannot be connected on-line.
POWER LED is lit
Self-diagnostic error code
11
Fatal CPU error
Occur frequently?
Malfunction due to noise
NO
YES
NO
1F
12 13
YES
YES
NO
13-7
Chapter 13 Troubleshooting
Power supply check
AC power supply type
• AC power supply voltage (at
the input terminal)
• DC power supply voltage (at
the output terminal)
DC power supply type
• DC power supply voltage (at
the input terminal)
• DC power supply voltage (at
the output terminal)
Fitting between terminal stand
and main unit
There is a possibility of power
supply area damage
Contact our service department