Hitachi NJI-350B - Manual (Page 288)

Chapter 13 Troubleshooting
13-13
(f) Wrong output from output module or output module will not output (operation problem)
The CPU operates, but output signals are not correct.
Check the output area
• Forced output
• I/O assignment
• Program
NO
YES
YES
NO
Check output signals
• Output signal voltage
• Power supply voltage for load
• Terminal block wiring
• Terminal block connector
connection
• Voltage between the common
and the bit
• Wiring
Especially for the S terminal
on the transistor
• The drive power supply for the
relay is not connected
NO
YES
LED error
∗ LED replacement may not be
performed by the user, so a
repair request must be
submitted
Check for output error
• Check the output power
supply
• Check the output program
• Malfunction due to noise
Output LED is not lit
Will not output
Output LED is lit
Will not output
Output LED is not lit
Will output