Flowchart For When The "L Err." Led Flashes - Mitsubishi Electric MELSEC QS SERIES User Manual

9
TROUBLESHOOTING

9.2.7 Flowchart for when the "L ERR." LED flashes

The following shows the flowchart for when the "L ERR." LED flashes at power ON of the
safety remote I/O module or during operation of the programmable controller.
9
- 10 9.2 Troubleshooting with LEDs
9.2.7 Flowchart for when the "L ERR." LED flashes
"L ERR." LED is flashing.
Is the link ID setting switch, station
number setting switch or transmission speed setting switch
operated during the module operation?
NO
Don't multiple master stations exist on
the same data link?
NO
Isn't the transmission line affected
by noises?
NO
Isn't a poor
connection occurring in the 2-piece
terminal block?
NO
Are the cable
wiring and the terminal resistance
value proper?
YES
Is the
station-to-station/overall cable length within
the specification range?
YES
Replace the safety remote I/O module.
Figure 9.7 Flowchart for when the "L ERR." LED flashes
YES
Undo the switch setting.
(For the switch settings, refer to Section 6.6.)
YES
Set one safety master module on the same data
link.
YES
Improve the laying by separating the bunching
part from the power line or by installing a shield.
YES
Softly push or shake the block terminal.
Replace the 2-piece terminal block.
NO
Check the cable wiring and terminal resistance
value of all the stations.
Check if the DA-DB terminal is not reversely
connected.
NO
Check the station-to-station/overall cable
length and make it within the
specification range.
Section 6.6