I/O Module Troubleshooting; When Run Led Is Flickering Or Off; When Err. Led Is On Or Flickering - Mitsubishi MELESEC-ST User Manual

12 TROUBLESHOOTING

12.3 I/O Module Troubleshooting

12.3.1 When RUN LED is flickering or off

12.3.2 When ERR. LED is on or flickering

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(1) Flickering at 0.25s intervals
Check item
Check whether the I/O module is selected as
the target of online module change.
(2) Flickering at 1s intervals
When the RUN LED of the I/O module is flickering (1s interval), refer to Section
12.1.3 for details.
(3) Off
When the RUN LED of the I/O module is off, refer to Section 12.1.2 for details.
(1) I/O module (except the output module with protective function or
fuse)
Target module: ST1X -DE1, ST1Y2-R2
ERR. LED is on.
Change the I/O
module whose ERR.
LED is on.
Has the ERR.
LED turned
off?
YES
Completed
Complete the online module change.
Refer to the head module manual for details.
NO
Please contact your local
Mitsubishi service center or
representative, explaining a
detailed description of the
problem.
MELSEC-ST
Corrective action
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