The L Run Led Does Not Turn On; The L Err. Led Is On Or Flashing - Mitsubishi Electric MELSEC Q Series User Manual

6.4.2
Check the following.
After changing a remote station number, power off and on the system.
After data link is established, the transmission speed setting
of the master station was changed.
A communication cable is incorrectly wired.
The station number setting switch is incorrectly set.
A station number is set outside the control range of the
master station.
The operation setting switch of the master station is
incorrectly set.
*1
If the L RUN LED does not turn on 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.
6.4.3
Check the following.
Switch setting is changed after power-on.
A communication cable is incorrectly wired.
*1
If the L ERR. LED remains on or 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.
Downloaded from ManualsNet.com

The L RUN LED does not turn on

Check item
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.

The L ERR. LED is on or flashing

Check item
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.
search engine
CHAPTER 6 TROUBLESHOOTING
Action
Power off and on the system.
*1
Correct the wiring.
( Page 49, Section 4.5)
Correct the station number with meeting the following:
• The number is 1 to 64.
• The ones digit is 0 to 9.
• Do not set the number using the output hold setting switch
and response speed setting switch.
After changing a remote station number, power off and on
the system.
• Check that the numbers of remote stations occupied by
the master station are 1 to 64.
• Check that station numbers set on remote stations are
within the control range of the master station.
After changing a remote station number, power off and on
the system.
Correct the setting. ( Page 45, Section 4.3)
After correcting the setting, power off and on the system or
reset the CPU module.
Action
Return the switch setting to the status before the switching.
*1
Correct the wiring.
( Page 49, Section 4.5)
6
71