Check With Leds (2) - During System Operation; When "Err." Led On The Safety Master Module Turns On Or Flashes With "Run" Led On The Safety Master Module Being On - Mitsubishi Electric MELSEC QS Series User Manual

9
TROUBLESHOOTING

9.3 Check with LEDs (2) - During System Operation

This section explains troubleshooting using the LEDs while the system is in operation.
9.3.1 When "ERR." LED on the safety master module turns ON or flashes
with "RUN" LED on the safety master module being ON
An error occurred on a remote
station. Refer to the troubleshooting
of the safety remote module.
Check the transmission speed
setting and the transmission path
condition.
9
9.3 Check with LEDs (2) - During System Operation
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9.3.1 When "ERR." LED on the safety master module turns ON or flashes with "RUN" LED on the safety
The "ERR." LED on the safety
master module turns ON or flashes.
Check data link status of the safety
master station. (Check this with the
host station monitor of the CC-Link
diagnostics.)
Data linking
Check status of other stations on the
other station monitor of the CC-Link
diagnostics, and identify the remote
station with a link error.
Is the remote station powered on?
Yes
Is the remote station a safety remote
station?
Yes
Is "ERR." LED on the safety CPU
module ON?
Yes
Is the error code in the error history of
PLC diagnostics within the range from
8300 to 8499?
Yes
Is the error code 8300? (Is it a
Yes
remote station error ?)
No
Is the error code 8320 or 8322?
(Is it an initial monitoring time out error ?)
Yes
(Is it an error monitoring time out error ?)
No
Is the error code 8321?
(Is it a safety refresh monitoring timeout error?)
(Is it a safety data monitoring
timeout error?)
Yes
Is the scan time exceeding the
value set for the safety refresh monitoring
timer and/or the safety data monitoring
timer?
Yes
Modify the value set for the safety refresh
monitoring timer and/or the safety data monitoring
timer. Or, shorten the sequence program.
Cut off
Is the scan time not too long for each
transmission speed?
No
No
Turn on the remote station.
No
1
No
No
Refer to the troubleshooting of the
safety CPU module.
No
No
Check the operations of the following
hardware and identify a faulty module.
(1) Remote module
(2) Safety master module
(3) Safety CPU module
(4) Safety main base unit
Yes
Shorten the sequence program. Or,
use slower transmission speeds.