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Mitsubishi FX1S-20MT-001 Programmable Logic Controller PLC (12 DI / 8 Transistor DO)

Mitsubishi Electric MELSEC-F FX1S series micro PLC, 20 I/O points (12 inputs / 8 transistor outputs), 100–240V AC supply, built-in 2000-step EEPROM, Y0/Y1 support 100kHz high-speed pulse output, for small-to-medium stepper/servo positioning and high-frequency DC load control.
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Product Details

1. Product Overview

The FX1S-20MT-001 is a micro PLC in Mitsubishi Electric's MELSEC-F FX1S series, integrating power supply, CPU, 12 digital inputs and 8 transistor outputs into one housing. At 75 mm wide, it supports DIN-rail or screw mounting and is an ideal control core for space- and cost-sensitive small-to-medium equipment.

This unit uses transistor outputs (MT), switching only DC loads (5–30V DC) but offering high-speed pulse output: Y0 and Y1 can each output up to 100kHz pulses simultaneously. Together with on-board positioning instructions (ZRN home return, PLSY/PLSR pulse output, DRVI/DRVA relative/absolute positioning), it directly drives stepper or servo amplifiers for simple single-axis positioning. Y2–Y7 are general transistor outputs for DC solenoid valves, relays and indicator lights.

The unit features built-in 2000-step EEPROM program memory (no battery), an on-board real-time clock and hour meter, and a built-in 24V DC / 400mA sensor supply.

2. Specifications

表格

Item Specification
Brand Mitsubishi Electric
Series MELSEC-F FX1S (micro PLC)
Model FX1S-20MT-001
Total I/O 20 points (12 in / 8 out)
Digital inputs 12 points (X0–X7, X10–X13), 24V DC ±10%; 7mA/point for X0–X7, 5mA/point for X10–X13, sink input
Digital outputs 8 transistor outputs (Y0–Y7), sink (NPN)
Output load voltage 5–30V DC (DC only)
Output rated current 0.5A/point, 0.8A/COM
Inductive load capacity 12W (24V DC)
High-speed pulse output Y0, Y1 each up to 100kHz, two axes simultaneous
General transistor outputs Y2–Y7 (non-pulse)
High-speed counters 60kHz single-phase (see programming manual)
Power supply 100–240V AC +10%/−15%, 50/60 Hz
Power interruption ride-through <10 ms continues operation
Program memory Built-in EEPROM 2000 steps (no battery; EEPROM life approx. 10,000 writes)
Programming language Ladder logic
Basic instruction speed Approx. 0.55–0.7 μs/step
Positioning instructions ZRN, PLSY/PLSR, DRVI/DRVA, ABSD
Auxiliary relays (M) 384 points general (incl. latched)
Timers (T) 199 × 100 ms + 46 × 10 ms
Counters (C) 16 general (C0–C15) + 16 latched (C16–C31)
Data registers (D) 128 general (D0–D127) + 128 latched (D128–D255), 16-bit
On-board sensor supply 24V DC, 400mA
Clock / hour meter Built-in RTC and run-hour meter
Expansion Expansion boards (4EX-BD, 2AD-BD, 1DA-BD, 2EYT-BD) and communication boards (232-BD, 485-BD)
Operating temperature 0–55 °C
Storage temperature −20–70 °C
Humidity 35–85% RH (non-condensing)
Mounting DIN rail or direct screw mounting
Dimensions (W×H×D) Approx. 75 × 90 × 75 mm
Weight Approx. 0.40 kg
Version note "-001" = Japanese domestic spec (fixed sink input, fixed sink/NPN output)

Per Mitsubishi FX1S hardware manual JY992D83901. Transistor outputs are DC-only and cannot directly switch AC contactors; for high-speed pulse output, keep load current in the 10–100mA range for clean waveforms. The FX1S is an earlier-generation model; new designs are recommended to use its successor FX3S-20MT/ES.

5. Model Information

  • Model (ordering number): FX1S-20MT-001
  • Product description: Mitsubishi Electric MELSEC-F FX1S micro PLC, 20 I/O (12 in / 8 transistor out), 100–240V AC supply, Japanese domestic spec, with high-speed pulse positioning.
  • Official catalog description: FX1S is the fit-and-forget PLC solution for space and cost conscious applications requiring up to 30 I/O; transistor output units provide up to 100kHz pulse output for simple positioning.
  • Material number note: FX1S-20MT-001 is the official Mitsubishi Electric ordering model (Japanese domestic spec). The equivalent international CE/UL version is FX1S-20MT-ESS/UL (source/PNP output). The "-001" suffix denotes Japanese domestic production with fixed sink input and fixed sink (NPN) output. If you have questions about the successor FX3S-20MT/ES compatibility or pulse wiring, please contact us by email.
  • Series features:
    • Compact integrated design, 75 mm wide, DIN-rail mountable
    • Transistor outputs support up to 100kHz high-speed pulse (Y0/Y1 two axes simultaneous)
    • On-board positioning instructions directly drive stepper/servo without an extra positioning module
    • Built-in EEPROM program memory, no battery, retained on power-off
    • On-board 24V DC / 400mA sensor supply simplifies field wiring
    • Built-in real-time clock and hour meter
    • Expansion boards add analog I/O and RS-232/RS-485 communication
    • Fast transistor response, long life (no mechanical contact wear), suited to high-frequency switching
  • Related models in series: FX1S-10MT (6 in / 4 out), FX1S-14MT (8 in / 6 out), FX1S-30MT (16 in / 14 out); relay-output versions carry the MR suffix
  • Matching products: Programming cable (SC-09 / USB-SC09), stepper/servo drives, expansion boards (FX1N-4EX-BD, FX1N-2AD-BD, FX1N-1DA-BD, FX1N-232-BD, FX1N-485-BD), text display (FX-10DM), GOT HMI
  • Official documents: Mitsubishi Electric FX1S Hardware Manual JY992D83901; FX1S Programming Manual; FX1S replacement guide FAM-A-0042-A (FX1S → FX3S)

6. Why Choose Us

  1. Exact model match: We verify supply against your full model FX1S-20MT-001, distinguishing MT (transistor) from MR (relay) and 001 (Japanese sink spec) from ESS/UL (international source spec) to avoid wrong shipment.
  2. Authorized channel supply: Mitsubishi Electric PLC supplied through regular channels, with product documentation available on request.
  3. Selection support: We help confirm pulse frequency, sink/source wiring, stepper/servo drive matching and sensor compatibility; we can advise on upgrading to FX3S.
  4. Delivery & after-sales: Quotation, lead-time confirmation and order follow-up provided; for any parameter questions or alternative options, please contact us by email.

7. FAQ

Q1: How many I/O points does the FX1S-20MT-001 have? What is the output type?

A: 20 points total: 12 digital inputs (X0–X7, X10–X13, 24V DC) and 8 transistor outputs (Y0–Y7). MT denotes transistor output, which switches DC loads only (5–30V DC) and cannot directly drive AC contactors.

Q2: Can this PLC do positioning control?

A: Yes. Y0 and Y1 each output up to 100kHz pulses simultaneously. With on-board instructions ZRN, PLSY/PLSR and DRVI/DRVA, it directly drives stepper or servo amplifiers for simple single-axis positioning. Y2–Y7 are general transistor outputs for ordinary DC load switching.

Q3: What does sink (NPN) output mean? How does it differ from source (PNP)?

A: Sink output (NPN) means that when ON, current flows from the external load into the PLC common (the output switches internally to 0V). FX1S-20MT-001 is the Japanese domestic model with fixed sink output; the international ESS/UL version is source (PNP). Wiring must match the pulse input type of the drive.

Q4: How do I choose between transistor and relay output?

A: Transistor output is fast, long-lived and supports high-speed pulses for DC loads and high-frequency switching. Relay output switches both AC and DC at higher current (2A/point) but is slow and has no high-speed pulse capability. Choose MT for high-speed positioning, MR for general switching.

Q5: Does this PLC need a backup battery?

A: No. The FX1S stores the user program in built-in EEPROM; there is no battery and the program is retained on power-off.

Q6: Is this PLC still in production? Is there a successor?

A: The FX1S series is an earlier-generation Mitsubishi micro PLC. Mitsubishi's official replacement guide recommends FX3S-20MT/ES (same 12 in / 8 transistor out, 100–240V AC, 16K-step program memory) for new designs. Migration requires program porting and pulse wiring review; please email us for a migration plan.

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