Chapter 9 Troubleshooting; Visual Inspection - Mitsubishi Electric MELSEC-Q Series User Manual

CHAPTER 9
If the transmission does not start normally, check the following items and perform the troubleshooting.
• All devices are being supplied with 24VDC power supply.
• The LINK LEDs of all the AnyWire DB A20 slave modules are flashing.
• The address settings are correct and unique.
For details on the entire AnyWire DB A20 system, refer to the "AnyWire DB A20 Series Technical Manual"
(manufactured by Anywire Corporation).
9.1

Visual Inspection

Check that the communication cables and wires are not disconnected and check the following items.
(1) Checking the LED status of the master module
Errors regarding the operating status and communications of the master module can be checked with the
following LEDs. When the LEDs are in the following status, settings and wiring need to be corrected.
(a) QJ51AW12D2
1.
Check the M ERR.LED of the master module.
If the M ERR.LED is on, perform the following troubleshooting.
Page 63, Section 9.3.1 (1)
2.
Check the LINK LED of the master module.
If the LINK LED does not flash, perform the following troubleshooting.
Page 63, Section 9.3.1 (2)
3.
Check the ALM LED of the master module.
If the ALM LED is flashing at 0.2-second intervals, perform the following troubleshooting.
Page 63, Section 9.3.1 (3)
If the ALM LED is flashing at 1 second intervals, perform the following troubleshooting.
Page 63, Section 9.3.1 (4)
If the ALM LED is on, perform the following troubleshooting.
Page 64, Section 9.3.1 (5)
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TROUBLESHOOTING