Troubleshooting By Symptom; When Cyclic Transmission Cannot Be Performed; When Transient Transmission Cannot Be Performed - Mitsubishi Electric MELSEC L Series User Manual

11.5
This section describes troubleshooting methods by symptom. Perform these troubleshooting actions when cyclic
and/or transient transmissions are not possible with the target station even though no error is detected in the head
module.
If an error has occurred in an intelligent function module installed with the head module, identify the cause of the error
by using GX Works2. (
● Before starting the troubleshooting by symptom, check that the POWER LED of the power supply module is on.
● When the troubleshooting by symptom cannot solve the problem
11.5.1
When cyclic data are not delivered to other stations, or when cyclic data from the master station cannot be received,
perform the following troubleshooting.
Is the D LINK LED of the head module on?
Are the I/O assignment settings of PLC parameter correct?
Is the switch on the head module set to "RUN"?
Is the RUN LED of the head module on?
If the above actions do not solve the problem, check the link device assignment of the master station and the refresh
target device setting of refresh parameters for an error. (
11.5.2
If transient transmission cannot be performed with the target station, check if the network number and station number
of the head module are correctly set. (
If the network number and station number are correctly set, refer to the troubleshooting for the master/local module,
and take action. (
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Troubleshooting by Symptom

Page 84, Section 11.2)
For troubleshooting of the power supply module, refer to the
Design, Maintenance and Inspection) .
Perform a unit test on the head module to check for a hardware failure. (

When cyclic transmission cannot be performed

Check item

When transient transmission cannot be performed

User's manual for the master/local module used)
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MELSEC-L CPU Module User's Manual (Hardware
If the D LINK LED is flashing or off, perform the troubleshooting by the
LEDs. ( Page 91, Section 11.4)
Set the I/O assignment correctly. (
Set the switch to "RUN".
If the RUN LED is flashing or off, perform the troubleshooting by the
LEDs. ( Page 91, Section 11.4)
User's manual for the master/local module used)
Page 53, Section 7.1 (1))
CHAPTER 11 TROUBLESHOOTING
Page 45, Section 6.4)
Action
Page 61, Section 7.1 (6))
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