Mitsubishi Electric Q26UD(E)HCPU

Questions and Answers

A
Andrea ZamoraAug 1, 2025
What to do if the POWER LED does not turn on for Mitsubishi Electric Q26UD(E)HCPU?
- F
  fcoxAug 1, 2025
  If the MODE LED of the CPU module is on, it indicates that the power supply module has failed and needs replacement. Ensure the power supply voltage is within the specified range. If the internal current consumption exceeds the rated output current, reexamine the system configuration. If the POWER LED turns on after removing all modules except the power supply module, repeatedly supply power, adding modules back one by one to identify the failed module.
D
Dr. Jennifer Gutierrez MDAug 6, 2025
Why is the Ethernet communication not possible through direct connection with my Mitsubishi Electric Controller?
- A
  Anthony FaulknerAug 6, 2025
  Ensure the CPU module is directly connected to the programming tool with a single cable. Verify that the settings on the connected device (personal computer) are correct. Also, check that 'Ethernet Port Direct Connection' is selected for the PLC side I/F PLC Module in the Transfer Setup setting of the programming tool.
C
Carol TylerAug 12, 2025
What should I do if communication is slow or unstable on my Mitsubishi Electric Q26UD(E)HCPU Controller?
- H
  Hector TaylorAug 12, 2025
  First, ensure that there are no duplicate IP addresses and correct any that are found. Next, verify that the number of UDP connections does not exceed the limit set in the open setting for MELSOFT connection and the MC protocol. Finally, if the issue persists, take noise reduction measures, as the communication of other devices besides the CPU module might be unstable.
A
aprilgrahamAug 16, 2025
What to do if the output load does not turn on in Mitsubishi Electric Controller?
- P
  parkertimothyAug 16, 2025
  Check the power supply load wiring and recover the power supply if voltage for the power supply load is not added. If the inrush current has exceeded the specified value when the maximum number of outputs turns on simultaneously, change the output relay number and keep the load maximum simultaneous on current within the specified value.
A
Anthony BerryAug 21, 2025
Why MODE LED does not turn on in Mitsubishi Electric Q26UD(E)HCPU?
- S
  smithjasonAug 21, 2025
  The MODE LED might not turn on because the forced ON/OFF is set; cancel the forced ON/OFF. Another reason could be an improper connection direction of the extension cable (OUT-OUT); connect the extension cable properly. Finally, ensure AC power is supplied to the power supply module.
B
Brandon HoweAug 27, 2025
What to do if clock data cannot be set by SNTP for Mitsubishi Electric Controller?
- T
  tommykruegerAug 27, 2025
  Check the following on the time setting function: SNTP is set to be used; Input of the SNTP server IP address is correct.

Summary

SAFETY PRECAUTIONS

Design Precautions

Precautions for designing safe and reliable systems, including safety circuits and output handling.

INTRODUCTION

CHAPTER 1 OVERVIEW

1.1 Features

Describes the features of Q series CPU modules, including I/O points and module selection.

CHAPTER 2 SYSTEM CONFIGURATION

2.1 Overall Configuration

Explains the overall system configuration, including module combinations and applicable base units.

2.2 Component List

Lists the components for different CPU modules, including base units, extension cables, and batteries.

2.3 Precautions for System Configuration

Details restrictions and precautions for system configuration, such as module mounting and number limits.

CHAPTER 3 CPU MODULE START-UP PROCEDURES

CHAPTER 4 INSTALLATION AND WIRING

4.1 Installation Environment and Installation Position

Covers installation environment conditions and positioning for optimal operability and maintainability.

4.2 Mounting a Module

Provides detailed precautions for mounting CPU modules, I/O modules, and other related modules.

4.3 Connecting an Extension Base Unit

Explains how to set the extension base number and connect extension cables.

4.4 Mounting and Removing a Terminal Block

Describes the procedure for mounting and removing terminal blocks, including 18-point types.

4.5 Installing and Removing a Memory Card

Provides instructions for installing and removing memory cards, including Q2MEM and Q3MEM types.

4.6 Installing and Removing an SD Memory Card

Details the procedure for installing and removing SD memory cards, including LED status checks.

4.7 Installing and Removing an Extended SRAM Cassette

Explains the procedure for installing and removing extended SRAM cassettes.

4.8 Wiring

Covers wiring precautions for power supplies, terminal blocks, and connectors.

CHAPTER 5 GENERAL SPECIFICATIONS

CHAPTER 6 CPU MODULE

6.1 Part Names

Details the part names and functions of various CPU modules.

6.2 Specifications

Lists the performance specifications for different CPU module types.

CHAPTER 7 POWER SUPPLY MODULE

7.1 Part Names and Settings

Describes the part names and settings for various power supply modules.

7.2 Specifications

Lists the performance specifications for different power supply modules.

CHAPTER 8 BASE UNIT

8.1 Part Names

Details the part names for main base units, extension base units, and related accessories.

8.2 Extension Base Units that can be Combined with the Main Base Unit

Lists extension base units compatible with main base units, indicating combinations.

8.3 Specification Table

Provides a table of specifications for main and extension base units.

CHAPTER 9 MEMORY CARD

9.1 Part Names

Details the part names of memory cards, including write protect switches and battery holders.

9.2 Specifications

Lists the specifications for SRAM, Flash, and ATA memory cards.

9.3 Handling

Provides precautions for handling memory cards, including formatting and installation.

CHAPTER 10 SD MEMORY CARD

10.1 Part Names

Identifies the parts of an SD memory card, including the write protect switch.

10.2 Specifications

Lists the specifications for SD memory cards, including capacity and number of writings.

10.3 Handling

Provides precautions for handling SD memory cards, including formatting and storable files.

CHAPTER 11 EXTENDED SRAM CASSETTE

11.1 Part Names

Identifies the parts of an extended SRAM cassette, including the knob.

11.2 Specifications

Lists the specifications for extended SRAM cassettes, including capacity and dimensions.

11.3 Handling

Provides instructions for installing and removing extended SRAM cassettes.

CHAPTER 12 BATTERY

12.1 Battery Specifications

Details the specifications of batteries used for CPU modules, including classification and initial voltage.

12.2 Battery Installation

Provides procedures for installing batteries (Q6BAT, Q7BAT-SET, Q8BAT-SET) into CPU modules.

CHAPTER 13 MAINTENANCE AND INSPECTION

13.1 Daily Inspection

Lists daily inspection items for base units, modules, and LED status.

13.2 Periodic Inspection

Details periodic inspection items for ambient environment, power voltage, and connections.

13.3 Replacement Procedure of the Battery

Explains the procedure for replacing CPU module batteries (Q6BAT, Q7BAT, Q8BAT).

CHAPTER 14 MODULE CHANGE DURING SYSTEM OPERATION

14.1 Online Module Change

Describes the function and procedures for changing modules online, including restrictions.

CHAPTER 15 TROUBLESHOOTING

15.1 Visual Inspection

Guides visual checks of LED status, communication cables, and wiring.

15.2 Checking the Error Details

Explains how to check error details using programming tools and module detailed information.

15.3 Checking for Functional Errors

Provides troubleshooting steps for various functional errors, including PLC, Ethernet, and module errors.

MANUALS

(1) CPU module users manual

Lists user's manuals for different CPU module types, including function explanation and program fundamentals.

(2) Programming manual

Lists programming manuals covering common instructions, SFC, MELSAP-L, and structured text.

(3) Operating manual

Lists operating manuals for GX Works2 and GX Developer.

(4) Intelligent function module manual

Lists manuals for intelligent function modules like CC-Link IE, MELSECNET/H, and serial communication.

(5) Others

Lists other related manuals, such as for iQ Sensor Solution and CC-Link IE Field Network.

TERMS

PACKING LIST