Checking With Led - Mitsubishi Electric MELSEC iQ-R Series User Manual

4.2

Checking with LED

This section describes troubleshooting using LED.
Error status can be determined by status of the RUN LED and the ERR LED.
RUN LED ERR LED
Off On, flashing
On Flashing
On On
*1 When multiple errors occur, the error status is displayed in the order of major, moderate, and minor.
When the RUN LED turns off
When the RUN LED turns off after powering on the remote head module, check the following.
Check item
Is the remote head module mounted correctly?
Does the RUN LED turn on when the power supply module is replaced and
the system is powered on again?
(Check the LED status after the power supply module on the extension base
unit is also replaced.)
Does the RUN LED remain off even after the power supply module is replaced
and the system is powered on again?
(Check the LED status after the power supply module on the extension base
unit is also replaced.)
Is the remote head module of the standby system being replaced in a
redundant system?
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 94 Module communication test)
When the BUS RUN LED turns off
When the BUS RUN LED turns off after powering on the remote head module, check the following.
Check item
Is the switch on the remote head module set to RUN?
Is it in the remote STOP state?
Has an error occurred in the remote head module?
Is the master station in the RUN state?
Is the remote head module disconnected during STOP of the master station?
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 94 Module communication test)
When the ERR LED turns on or is flashing
When the ERR LED turns on or is flashing, check the following.
Check item
Does any error occur in the module diagnostics?
Is an error displayed in the CC-Link IE Field Network diagnostics?
If the above actions do not solve the problem, perform the following tests to check for an error.
• Module communication test ( Page 94 Module communication test)
• Cable test ( MELSEC iQ-R CC-Link IE Field Network User's Manual (Application))
*1
Error status Description
Major error An error such as hardware failure or memory failure. The module stops operating.
Moderate error An error, such as parameter error, which affect module operation. The module stops
operating.
Minor error An error such as communication failure. The module continues operating.
Action
Securely mount the remote head module on the main base unit.
The power supply module before the replacement has failed. Replace the
power supply module.
One of the modules except the power supply module has failed. Repeatedly
supply power to the system, returning the modules to the system one by one.
The last module mounted immediately before the RUN LED turns off has
failed. Replace the corresponding module.
Reset the replaced remote head module of the standby system.
Action
Set the switch on the remote head module to RUN to start data link.
Cancel the remote STOP state and start data link.
Identify the error cause on the system monitor window using the engineering
tool, and take action. ( Page 87 Troubleshooting Procedure)
Set the operating status of the master station to RUN. If the master station has
stopped due to an error, troubleshoot it referring to the manual for the master
station. ( User's manual for the master/local module used)
• Set the operating status of the master station to RUN and reconnect the
remote head module to the network.
• Reset the remote head module because it retains the STOP status of the
master station.
Action
Take the actions displayed on the window.
Take the actions displayed on the window.
4 TROUBLESHOOTING
4.2 Checking with LED
4
89