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FX3U-128MR/ES-A

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Mitsubishi Electric FX3U-128MR/ES-A is a 128-point FX3U PLC main unit with AC supply, 24 VDC inputs and relay outputs.
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Technical specifications for FX3U-128MR/ES-A

  • Manufacturer:
    Mitsubishi
  • Part Number:
    FX3U-128MR/ES-A
  • Product Family:
    Mitsubishi
  • Product Type:
    128-point FX3U PLC Main Unit
  • Stock:
    1
  • PLC Series:
    MELSEC-F FX3U
  • Total I/O Points:
    128
  • Inputs:
    64 points, 24 VDC sink/source
  • Outputs:
    64 relay points
  • Power Supply Type:
    AC power supply
  • Output Connection:
    Removable terminal blocks
  • Built-in 5 VDC Capacity:
    600 mA
  • Built-in 24 VDC Service Supply:
    400 mA
  • Mounting:
    DIN rail or direct mounting
  • Output Load Class:
    Relay output
  • Weight:
    1.8 kg
  • Estimated shipping dimensions:
    35 x 9 x 8.6 cm
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    Japan
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals System Inventory Changeout Control Migration Planning Product Applications

Features:

  • Integrated high I/O count: The controller consolidates CPU and extensive discrete I/O in one FX3U main unit.
  • Relay-output topology: Common groups and terminal placement must be preserved during a hardware change.
  • Planned lifecycle transition: Mitsubishi’s announced schedule supports proactive project backup and migration engineering.
FX3U-128MR/ES-A is intended for machines that need a large number of built-in discrete points without separating the CPU from all local I/O.

Expansion devices draw from the controller’s internal power budget, so the installed system inventory is part of the replacement assessment.

Commissioning proceeds by proving input groups and isolated output groups in stages against the PLC project and electrical drawings.

Apter Power can help confirm the Mitsubishi Electric FX3U-128MR/ES-A 128-point FX3U PLC Main Unit, terminal layout and expansion inventory before quotation.
Mitsubishi Electric FX3U-128MR/ES-A 128-point FX3U PLC Main Unit Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Project backup: Save the verified PLC program, parameters and comments before removing the controller.
  • Expansion list: Record every adapter, board and special-function unit connected to the main unit.
  • Power budget: Recalculate internal supply demand when expansion hardware changes.
  • Terminal identity: Label both terminal blocks and common groups before disconnection.
  • Safe state: Isolate hazardous loads and stored energy before touching output wiring.
  • Program restore: Verify model settings and project integrity before allowing field outputs.
  • Grouped testing: Prove input and output commons in controlled sections instead of energizing the whole machine at once.
  • Retentive data: Decide which operating values require restoration and which must be reinitialized.
  • Architecture review: A successor PLC may change terminal arrangement, expansion hardware and software workflow.
  • I/O mapping: Map every physical point and internal device before translating the application.
  • Communication review: Inventory networks, HMIs and programming tools that depend on the FX3U controller.
  • Acceptance baseline: Capture current cycle, alarms and interlocks so the migrated system can be compared objectively.
  • Packaging machinery: Coordinates dense discrete I/O and relay-controlled machine functions.
  • Assembly equipment: Centralizes sequence logic and local field wiring in an FX3U controller.
  • Material handling: Controls sensors, contactors and interlocks across conveyor or transfer equipment.
  • Legacy PLC support: Maintains an installed FX3U system while migration work is prepared.
Description
FX3U-128MR/ES-A is a large-point-count FX3U main unit that combines the CPU, AC power supply, DC inputs and relay outputs in one controller body.

The terminal layout and expansion-power budget of FX3U-128MR/ES-A define how field I/O and special-function hardware are arranged, so replacement begins with a complete project and wiring record.

Mitsubishi has announced future discontinuation for the FX3U platform; FX3U-128MR/ES-A remains orderable during the stated window, making planned backup and migration work preferable to an emergency conversion.
Alternative Names
FX3U128MRESA FX3U-128MR/ES FX3U 128MR ES A
Technical notes
FX3U-128MR/ES-A carries many field circuits in a single main unit, so a terminal or common-group error can affect multiple machine functions at once. Label both removable terminal blocks, back up the verified PLC project, record expansion devices, and perform staged I/O proving with hazardous outputs isolated before automatic operation.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
An FX3U-128MR/ES-A replacement has the correct part number. What information is still required before installation?
Keep the verified PLC project, expansion inventory, terminal labels, internal power calculation and any retentive data needed to restore machine operation.
Why should FX3U-128MR/ES-A outputs be commissioned in groups?
The relay commons serve multiple circuits. Staged testing limits the consequence of a shared wiring error and makes fault isolation clearer.
A new FX3U-128MR/ES-A reports expansion errors after the project is restored. Where should troubleshooting begin?
Compare the physical expansion order, adapter boards, unit numbers and internal current demand with the original system configuration.
Can FX3U-128MR/ES-A be considered obsolete immediately because Mitsubishi announced discontinuation?
No. The official schedule still places it in the orderable period. Treat it as active but approaching discontinuation and plan accordingly.
A terminal block from the old FX3U-128MR/ES-A fits the replacement. Is that enough to energize the machine?
No. Confirm every common, supply and point assignment against drawings and the project, then test with hazardous loads isolated.
Is a newer Mitsubishi PLC automatically compatible with an FX3U-128MR/ES-A program?
No. CPU behavior, devices, expansion units, networks, software and wiring must be converted and validated through a formal migration project.