Mitsubishi Melsec-L Series User Manual page 60

(2) The L ERR. LED is flashing
Error (all stations) (bit 1) of Detailed error information (buffer
memory address: 16 (Un/G16)) is not on.
A 24VDC supply voltage is outside the specified range.
A faulty remote station is detected by Faulty station
information (buffer memory address: 4 to 7 (Un/G4 to 7)).
( Page 68, Appendix 1)
A communication cable is incorrectly wired.
*1 Measure a voltage using check terminals on the terminating resistor.
*2 Check for short circuit, reverse connection, disconnection, excessive pressure, terminating resistors, overall cable
distance, branch line distance (overall branch line length, maximum branch line length), and surrounding environment
such as a noise.
If the L ERR. LED remains flashing even after the above actions are taken, the possible cause is a hardware
failure.
Please consult your local Mitsubishi service center or representative, explaining a detailed description of the
problem.
58
Check item
Check terminal 24G
Please consult your local Mitsubishi service center or
representative, explaining a detailed description of the
problem.
Reduce the supply voltage within the specified range.
Troubleshoot the faulty remote station.
Remote I/O station:
Remote device station
User's manual for the remote device station used
*2
Correct the wiring.
( Page 36, Section 6.3)
Check terminal 24V
Action
*1
Page 59, Section 8.4