With 12 inputs and 8 relay outputs on board, the Mitsubishi FX3S-20MR/ES is one of the standard FX3S base units used in machine building and panel retrofits.
It is programmed with Mitsubishi GX Works2 (or GX Works3 for conversion projects). The program is stored in the CPU, so a replacement unit only needs the project file to be downloaded again.
Mitsubishi Electric lists the FX3S-20MR/ES as discontinued (EOL 19.06.2026, last time buy 31.01.2027). Spares for installed machines remain in demand; ask us for stock or for the current successor before you plan a retrofit.
More Mitsubishi Electric automation parts: Mitsubishi range.
Technical data
| Series | MELSEC-F Series |
|---|---|
| Type | FX3S |
| Power Supply (V) | 100-240 |
| Current Type | AC |
| Integrated Digital Inputs | 12 |
| Integrated Digital Outputs | 8 |
| Output Type | Relay |
| Program Memory | 16K Steps |
| Program Memory Unit | EEPROM |
| Local I/O Points | 30 |
| Local + Remote I/O Points | 30 |
| Expandable | NO |
| Cycle Time LD (ns) | 210 |
| Cycle Time MOV (ns) | 500 |
| USB | 1 |
| RS-422 | 1 |
| Power Consumption (W) | 20 |
| Buffer Battery | NO |
| Protection Class | IP10 |
| Min. Ambient Temperature (°C) | 0 |
| Max. Ambient Temperature (°C) | 55 |
| Weight | 0.4 kg |
| Sales start (Mitsubishi) | 02.09.2013 |
| Discontinued (EOL) | 19.06.2026 |
| Last Time Buy (LTB) | 31.01.2027 |
| Last Time Purchase (LTP) | 28.02.2027 |
| End of Service (EOS) | 19.06.2033 |
| CE | Compliant |
| UL/cUL | Compliant |
| Shipping Approvals | Abs,bv,dnv Gl,lr,nk |
| Dimensions (W x H x D) | 75 x 90 x 75 mm |
| Brand | Mitsubishi Electric |
| Condition | New, original |
Key features
- 12 digital inputs, 8 relay outputs
- Supply 100-240 V AC
- Program memory 16K Steps (eeprom)
- LD instruction time 210 ns
- Up to 30 I/O points including remote I/O
Typical applications
- Small and medium machine control panels
- Conveyors and material handling
- Replacement of a failed CPU in an existing machine
- Packaging, filling and labelling machines
Compatibility and replacement
Replace with the identical model FX3S-20MR/ES to keep the same terminal layout and power supply (100-240 V AC). Check the suffix carefully: R = relay outputs, T = transistor outputs, ES/ESS and DS/DSS set the supply and sink/source logic.
Back up the PLC program before removing the old unit, and download it to the new CPU with the same software version or newer.
Frequently asked questions
What power supply does it need?
100-240 V AC, per Mitsubishi.
Which software programs it?
Mitsubishi GX Works2 (or GX Works3 for conversion projects).
Does it need a battery?
Mitsubishi lists the buffer battery as: no.
How many I/O does it have?
12 digital inputs and 8 relay outputs built in, per Mitsubishi.
Can I get a price and delivery time?
Prices are quoted on request. Send the order number, quantity and delivery country on WhatsApp and we will reply with price and delivery time; air shipping is usually 5 to 7 days once ready, with a 1-year warranty.
Before you order
Compare the complete order number on the old unit with this page, including the suffix: in most ranges the last characters set the coil voltage, current range or version. If the label is worn, send us a photo and we will identify the part.
RendatSP ships from Yiwu, China, to factories worldwide; air delivery usually takes 5 to 7 days once the part is ready. The part is new and original with a 1-year warranty (shipping, payment and warranty). For a quotation, message us on WhatsApp with the order number and quantity. We also have agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
