Mitsubishi Electric MELSEC QS Series User Manual page 148

9
TROUBLESHOOTING
Connect terminating resistors at
both ends.
Connect the cables properly.
9
9.3 Check with LEDs (2) - During System Operation
- 18
9.3.1 When "ERR." LED on the safety master module turns ON or flashes with "RUN" LED on the safety
3
Is the transmission speed setting
correctly made?
2
Yes
Are a terminating resistors connected
No
at both ends?
Yes
Do the terminating resistors
used conform to the
cable specifications?
Yes
Are the CC-Link
dedicated cables properly connected?
(Is it confirmed that none of the following is found?:
No
wire break, short-circuit, incorrect wiring, faulty connection,
nonconformance with the CC-Link dedicated
cable specifications)
Yes
Is there noise generated on the
CC-Link dedicated cable?
Yes
The hardware of the remote station may be
faulty. Replace the remote station.
No
Correct the transmission speed
setting.
No
CC-Link dedicated
Use terminating resistors
compliant with the cable
No
Check the following and take a
measure accordingly.
Are the CC-Link dedicated cable
and the power cable placed close
to eachother?
Is FG separated from the power
system grounding?
Reduce the transmission speed and
check how often the error occurs.