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
Summary of Contents for HIDIC MICRO-EH
Page 1: ...HITACHI PROGRAMMABLE CONTROLLER APPLICATION MANUAL NJI 350B X ...
Page 12: ...MEMO ...
Page 14: ...Chapter 1 Features 1 2 MEMO ...
Page 50: ...Chapter 4 Product lineup and wiring 4 18 MEMO ...
Page 196: ...Chapter 5 Instruction Specifications 5 146 ...
Page 263: ...Chapter 11 Communication Specifications 11 10 MEMO ...