Mitsubishi Electric MELSEC-Q Series

Other manuals for Mitsubishi Electric MELSEC-Q Series

Programming Manual624 pages

Reference Manual674 pages

Handbook244 pages

Manual35 pages

Structured Programming Manual122 pages

Quick Start Guide52 pages

Questions and Answers:

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valvarezSep 4, 2025
Why can't I read input data from a remote I/O station using Mitsubishi Electric Control Unit?
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  Michael EsparzaSep 4, 2025
  If you cannot read input data from a remote I/O station with your Mitsubishi Electric Control Unit, it might be because the master station isn't recognizing the remote I/O station. Ensure the communication cable is correctly wired. Also, check if the input LED of the remote I/O station is on; if not, correct the wiring between the remote I/O station and the external device. An incorrect remote input address or a duplicated station number could also be the cause. Correct the address or station number, and then power off and on the system.
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Tiffany ChapmanSep 4, 2025
What does it mean when the L ERR. LED is flashing on my Mitsubishi Electric Control Unit?
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  Cynthia SmithSep 4, 2025
  If the L ERR. LED is flashing on your Mitsubishi Electric Control Unit, it could be due to a 24VDC supply voltage being outside the specified range; reduce the supply voltage within the specified range. Another potential cause is a communication cable that is incorrectly wired; correct the wiring.
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Zachary AdkinsSep 5, 2025
Mitsubishi Electric Control Unit: why can't data be output from a remote I/O station?
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  Dr. James KennedySep 5, 2025
  If data cannot be output from a remote I/O station with your Mitsubishi Electric Control Unit, verify that the master station recognizes the remote I/O station by ensuring the communication cable is correctly wired. Check if the output LED of the remote I/O station is on and the address is correct. Also, ensure the wiring between the remote I/O station and the external device is correct.
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Mark PowellSep 5, 2025
What does it mean when the L ERR. LED is on for Mitsubishi Electric Control Unit?
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  Angela MyersSep 5, 2025
  If the L ERR. LED is on for your Mitsubishi Electric Control Unit, it could be due to a remote station being connected outside the control range. Try removing the remote station, increasing the number of occupied I/O points, or setting a greater value for the last station number. After these actions, power off and on the system or reset the CPU module. Another possible cause is a communication cable that is incorrectly wired, so ensure the wiring is correct.
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Mrs. Cynthia GrahamSep 6, 2025
Why is the L RUN LED not turning on for my Mitsubishi Electric Control Unit?
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  cunninghamjillSep 6, 2025
  If the L RUN LED does not turn on for your Mitsubishi Electric Control Unit, and data link is established, it may be because the transmission speed setting of the master station was changed. Power off and on the system. Also, check that the communication cable is correctly wired.
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Amanda HurstSep 6, 2025
What to do if the ERR. LED is on for Mitsubishi Electric Control Unit?
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  lindsay08Sep 6, 2025
  If the ERR. LED is on for your Mitsubishi Electric Control Unit, the transmission speed setting switch or the point mode setting switch may be incorrectly set. Correct the setting, then power off and on the system or reset the CPU module.
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Kevin RiversSep 7, 2025
Why is the ERR. LED flashing on my Mitsubishi Electric Control Unit?
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  alexandercatherineSep 7, 2025
  When the operation setting switch is switched after power-on, the ERR. LED starts flashing. Reset the switch to the status before the switching.
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stephenreynoldsSep 7, 2025
How to fix L RUN LED not turning on in Mitsubishi Electric Control Unit?
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  Sierra CallahanSep 7, 2025
  If the L RUN LED does not turn on for your Mitsubishi Electric Control Unit, it may be because the CPU module has just exited from reset status. Wait for a while. Another possible cause is that Data link stop (bit 0) of Data link stop/restart instruction is on. Turn off the Data link stop then turn on Data link restart (bit 15).