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Chapter 13 Troubleshooting
13-10
(d) Wrong input at input module or no input (operation problem)
The CPU runs, but the input data is not correct.
Check input signals
•
Input signal voltage
•
Input power supply type
•
Cable disconnection
•
High-speed pulse is entered
in a normal input
NO
YES
YES
NO
Check input signals
•
Check input monitor
•
I/O assignment
•
Program
•
Input signal voltage
NO
YES
LED error
∗
LED replacement may not be
performed by the user, so a
repair request must be
submitted.
Check for input error
•
Check input signal source
•
Check input program
•
Malfunction due to noise
Input LED is not lit
Input is not read
Input LED is lit
Input is not read
Input LED is not lit
Input is read