Mitsubishi Electric MELSEC-Q Series User Manual (English)

Other manuals for Mitsubishi Electric MELSEC-Q Series

User Manual834 pages

Reference Manual674 pages

Manual35 pages

Programming Manual624 pages

Structured Programming Manual122 pages

Quick Start Guide52 pages

Questions and Answers:

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Phillip GeorgeAug 25, 2025
What to do if the ERR LED is on or flickering on my Mitsubishi Electric Controller?
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  fclineAug 25, 2025
  If the ERR LED on your Mitsubishi Electric Controller is on or flickering, it could be due to several reasons. First, check if the battery is connected properly or if the battery voltage has dropped, and replace the battery if needed. Also, one of the Error detection signals (X11 to X19, X1C) could be on, indicating errors like tag collection, logging, CPU event monitor, tag event monitor, time event monitor, access target CPU, e-mail transmission, FTP transfer, connection, or other errors. Confirm the error definition and take corrective action according to the error code stored when any of the errors is detected. You can also check the error code in "System monitor" of GX Developer and confirm the error definition and take corrective action according to the error code.
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Carmen NewtonAug 29, 2025
What to do if Mitsubishi Electric MELSEC-Q displays error code 3?
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  bryantmonicaAug 29, 2025
  If the Mitsubishi Electric Controller displays error code 3, it means a write operation to an area enabled only in setting mode was performed in operation mode. Correct this by: 1. Switching to the setting mode. 2. Setting the correct value. 3. Activating the error reset command (Yn2). Also, when switching from operation mode to setting mode, ensure the PID continuation flag (buffer memory address: A9H) is 0 and turn off the operation mode command (Yn1).
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Victoria NicholsAug 30, 2025
What to do if Mitsubishi Electric MELSEC-Q Controller displays error code 6?
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  Sharon NewtonAug 30, 2025
  If the Mitsubishi Electric Controller displays error code 6, it means the set value was altered during default setting registration. To correct this, activate the error reset command (Yn2), and then change the set value.
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Terry JohnstonAug 30, 2025
What to do if Mitsubishi Electric MELSEC-Q Controller displays error code 2?
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  Kelly BallAug 30, 2025
  If the Mitsubishi Electric Controller displays error code 2, it indicates that a non-zero value was written to a reserved area. To resolve this, turn on the error reset command (Yn2) and remove the program responsible for writing to the reserved area.
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Melissa HarrisAug 31, 2025
Why is the ERR LED flashing red on my Mitsubishi Electric MELSEC-Q CPU module?
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  Rebecca ArmstrongAug 31, 2025
  The "ERR." LED flashes red on the CPU module due to several potential causes: 1. Programs and PLC parameters might not be written to the CPU module. To resolve this, write the necessary programs and parameters to the CPU module. 2. If the CPU has multiple programs, they might not be registered to the PLC parameter. In this case, register them in the program setting of the PLC parameter and write the parameters to the CPU module. Alternatively, if multiple programs are unnecessary, delete the extra data. 3. There may be other errors. Check for errors following the guidelines in the manual.
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Patricia BryantAug 31, 2025
Why is the I/O and parameter data of the slave module unstable on my Mitsubishi Electric MELSEC-Q Controller?
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  mmedinaSep 1, 2025
  If the I/O data and parameter data of the slave module are unstable on your Mitsubishi Electric Controller, consider these points: Ensure the terminating unit is correctly connected with the correct polarities. Make sure the total length of the AnyWireASLINK system is within the specified range. Use the correct type and wire diameter for the transmission cables (DP, DN), and ensure they are tightened to the correct torque at the terminal block. Verify that the 24VDC external power supply voltage is within the rated value (21.6VDC to 27.6VDC). Set a unique address for each slave module. Finally, ensure that only one master module or AnyWireASLINK bridge module is connected within one AnyWireASLINK line.
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jennifer61Sep 1, 2025
What does it mean if the ALM LED on my Mitsubishi Electric Controller master module is flashing at one-second intervals?
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  Kelly MorrisonSep 1, 2025
  If the ALM LED on the master module of your Mitsubishi Electric Controller is flashing at one-second intervals, check these items: Ensure the transmission cables (DP, DN) are not short-circuited. Verify that the transmission cables (DP, DN) are not in contact with each other and that there is no incorrect wiring in the terminal block wiring of the master or slave module. Ensure the current consumption of all slave modules does not exceed the transmission cable supply current of the master module by correcting the cables (wire diameter, total length) and modules (type, number of connected modules).
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Sarah PowellSep 1, 2025
What to do if I can't check the I/O data and parameter data of the slave module on my Mitsubishi Electric Controller?
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  brianholmesSep 1, 2025
  If you cannot check the I/O data and parameter data of the slave module on your Mitsubishi Electric Controller, verify the following: Ensure that the information regarding the slave module has been properly assigned and that the commands written in the program are correct. Check that the address of the slave module is within the number of transmission points of the master module. Examine the I/O LED status of the slave module and check for any disconnections, short circuits, or poor contact in the wiring on the load side. Ensure that only one master module is connected within one AnyWireASLINK line.
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gavincooperSep 2, 2025
Why is the ALM LED on the Mitsubishi Electric MELSEC-Q Controller master module flashing rapidly (0.2-second intervals)?
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  Kenneth RiveraSep 2, 2025
  If the ALM LED on the master module of your Mitsubishi Electric Controller is flashing at 0.2-second intervals, consider these checks: Adjust the power supply voltage of the 24VDC external power supply to be within the rated value (21.6VDC to 27.6VDC). Make sure the power cables (24V, 0V) are neither disconnected nor short-circuited. Confirm that the 24VDC external power supply is correctly connected to the terminal blocks of both the master and slave modules.
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ukimSep 2, 2025
Why is the RUN LED not turning on for my Mitsubishi Electric Control Unit?
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  Krystal SmithSep 3, 2025
  If the RUN LED on your Mitsubishi Electric Control Unit doesn't turn on, it could be due to the module not being correctly mounted. Try removing the module and then mounting it again. Another cause might be that the internal current consumption of your entire system exceeds the rated output current of the power supply module. In this case, reconfigure the system to ensure the internal current consumption is within the rated output current.