Mitsubishi Electric MELSEC-Q Series User Manual (English)

Other manuals for Mitsubishi Electric MELSEC-Q Series

Reference Manual674 pages

Manual35 pages

Programming Manual624 pages

Handbook244 pages

Structured Programming Manual122 pages

Quick Start Guide52 pages

Questions and Answers:

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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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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.
D
Deanna JenkinsAug 25, 2025
What to do if CompactFlash card setting status (X1) does not turn on, or it takes a long time to turn on, on Mitsubishi Electric MELSEC-Q?
- Q
  qsmithAug 26, 2025
  If the CompactFlash card setting status (X1) on your Mitsubishi Electric Controller doesn't turn on or takes a long time, it may be because the file access stop status is active (X2 is on). Cancel the file access stop status to resolve this. Another potential cause is having many files stored on the CompactFlash card, which lengthens the time required for X1 to turn on. In this case, deleting unnecessary files in the CompactFlash card may help.
R
ryanthompsonAug 26, 2025
How to fix a Mitsubishi Electric MELSEC-Q when the RUN LED does not turn on?
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  Molly CamachoAug 26, 2025
  If the RUN LED on your Mitsubishi Electric Controller does not turn on, it could be because the module is not ready. Wait until the module starts. Alternatively, a watchdog timer error (X1F) might be active. If the watchdog timer error is ON, please consult your local Mitsubishi representative.
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Elizabeth GilmoreAug 26, 2025
What to do if Mitsubishi Electric MELSEC-Q Controller shows operation errors (Error code: 1000 to 1899)?
- S
  Sarah MejiaAug 27, 2025
  If your Mitsubishi Electric Controller displays operation errors with error codes ranging from 1000 to 1899, correct the parameters. After correcting the parameters, reset the error and then turn ON the PLC READY signal [Y0].
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Rachael JohnsonAug 27, 2025
How to fix a Mitsubishi Electric MELSEC-Q Controller when the RUN LED doesn't turn on?
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  Megan TuckerAug 27, 2025
  If the RUN LED on your Mitsubishi Electric Controller isn't turning on, try the following: First, remove the master module and then remount or reconnect it. Next, make sure the internal current consumption doesn't exceed the rated output current of the power supply module by examining the system configuration. Finally, use the PLC diagnostics of the programming tool to check for and correct any errors.
G
Gina SingletonAug 27, 2025
What to do if the ALM LED on the Mitsubishi Electric MELSEC-Q master module is constantly on?
- S
  Steven JohnsonAug 27, 2025
  If the ALM LED on the master module of your Mitsubishi Electric Controller is constantly on, check the following: Ensure the transmission cables (DP, DN) are not disconnected. Verify that the transmission cables (DP, DN) and power cables (24V, 0V) are properly connected to the terminal block of the master module. If you've added, removed, or changed the address of a slave module, perform automatic address detection. Also, if the LINK LED of the slave module isn't flashing, check for disconnections, short circuits, incorrect wiring, or poor contact in the transmission cables (DP, DN) around the module.
B
Brian FrederickAug 27, 2025
How do I fix a Mitsubishi Electric MELSEC-Q when the SET LED on the master module is flashing and won't turn off?
- J
  Jillian BrownAug 27, 2025
  If the SET LED on the master module of your Mitsubishi Electric Controller is flashing and does not turn off, try the following: Reset the CPU module, or power cycle the system (power off and then on). Ensure that automatic address detection is not being performed while parameter access is in progress.
J
Jake GreerAug 28, 2025
What should I do if the LINK LED on the Mitsubishi Electric Controller master module isn't flashing?
- B
  Brent RichAug 28, 2025
  If the LINK LED on the master module of your Mitsubishi Electric Controller isn't flashing, use the PLC diagnostics of the programming tool to check for and correct any errors.
D
Donna LeonAug 28, 2025
What to do if Mitsubishi Electric MELSEC-Q shows error code 4?
- C
  Christopher SchultzAug 28, 2025
  If the Mitsubishi Electric Controller displays error code 4, it means data outside the allowed setting range was entered. To fix this, ensure that you set the data within the specified range.