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