Mitsubishi Electric MELSEC-Q Series User Manual page 63

(b) LJ51AW12D2
1.
Check the LINK LED of the master module.
If the LINK LED does not turn on or flash even after power-on, perform the following troubleshooting.
Page 64, Section 9.3.2 (1)
If the LINK LED does not flash, perform the following troubleshooting.
Page 64, Section 9.3.2 (2)
2.
Check the ALM LED of the master module.
If the ALM LED is flashing at 0.2-second intervals, perform the following troubleshooting.
Page 65, Section 9.3.2 (3)
If the ALM LED is flashing at 1 second intervals, perform the following troubleshooting.
Page 65, Section 9.3.2 (4)
If the ALM LED is on, perform the following troubleshooting.
Page 65, Section 9.3.2 (5)
3.
Check the RUN LED of the master module.
If the RUN LED does not turn on, perform the following troubleshooting.
Page 65, Section 9.3.2 (6)
(2) Checking the status of the slave module
Check that there is no error in the slave module.
For the troubleshooting of the slave module, refer to the following.
Page 66, Section 9.4
• When the data (I/O data and parameter data) of the slave module cannot be checked
• When the data (I/O data and parameter data) of the slave module data is unstable
CHAPTER 9 TROUBLESHOOTING
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