Hitachi HIDIC MICRO-EH Applications Manual page 286

Data cannot be entered.
Is there a wiring
error, disconnection
or loose screw on the
terminal block?
Is there input
when the voltage is
checked between
the common and bit
on the input side?
Is the LED lit?
YES
Is there an error on the
internal contactors on the
terminal stand?
NO
Contact our service department
I/O assignment error is generated, but data is read.
Are the program and I/O
assignment correct?
Is the cable in the
expansion unit
damaged?
Replace the expansion cable
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
13-11
Chapter 13 Troubleshooting
Perform rewiring
Check the wiring systems
Change the voltage to satisfy
the specifications
Contact our service department
Replace the terminal block
Correct the error
Replace the expansion unit