Background: The FX1S provided a low-cost option for entry-level PLC control with a wide variety of I/O size and power options.

Lifecycle: Introduced (2000) – Discontinued (2015)

Service Life: Repair period currently active, end December 2022

Migration Info: The FX3S PLC should be used in place of an FX1S PLC. The FX3S has the same I/O configurations as the FX1S, with wiring and dimensions being very similar if not identical. FX3S PLCs can be programmed using the same software as the FX1S, but some review is necessary to ensure that all functions of the program are migrated successfully. Please contact your local Mitsubishi representative if additional assistance is required.

Suggested Replacements: The following tables list affected FX products and suggest replacements. Please confirm all specifications with the applicable manuals. 

  • Suggested part numbers are not always drop-in replacements
  • Replacing one main unit or expansion product may require an upgrade to the entire system
  • You may need to change programs and wiring 
Main Units
 Discontinued Product   Suggested Replacement 
 FX1S-10MR  FX3S-10MR/ES
 FX1S-10MT  FX3S-10MT/ES
 FX1S-14MR  FX3S-14MR/ES
 FX1S-14MT  FX3S-14MT/ES
 FX1S-20MR  FX3S-20MR/ES
 FX1S-20MT  FX3S-20MT/ES
 FX1S-30MR  FX3S-30MR/ES
 FX1S-30MT  FX3S-30MT/ES
 FX1S-10MR-D  FX3S-10MR/DS
 FX1S-10MT-D  FX3S-10MT/DS
 FX1S-14MR-D  FX3S-14MR/DS
 FX1S-14MT-D  FX3S-14MT/DS
 FX1S-20MR-D  FX3S-20MR/DS
 FX1S-20MT-D  FX3S-20MT/DS
 FX1S-30MR-D  FX3S-30MR/DS
 FX1S-30MT-D  FX3S-30MT/DS
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