Mitsubishi MELSEC FX1S Series Modules FX1S-30MT-001

Technical Dossier

Product Details And Specifications

Mitsubishi MELSEC FX1S Series Technical Notes

The Mitsubishi MELSEC FX1S series is a compact, fixed I/O programmable logic controller platform developed by Mitsubishi Electric for light-to-medium industrial automation applications. Deployed across chemical processing plants, water treatment facilities, packaging lines, textile machinery, and building automation systems globally, the FX1S occupies the entry-level tier of the MELSEC FX family. Its all-in-one architecture integrates CPU, power supply, and I/O into a single housing, making it a standard specification in installations where panel space and budget are constrained. Despite its compact form factor, the FX1S supports high-speed pulse output (up to 100 kHz), interrupt inputs, and serial communication via optional adapters, giving it a functional footprint that exceeds its physical size. Installed base across Asia-Pacific, Europe, and the Americas remains substantial, and demand for spare units and replacement modules continues from facilities operating legacy lines with no near-term migration plan.

The Evolution of FX1S Architecture

The MELSEC FX1S was introduced as a successor to the FX0S and FX0N compact PLC lines, inheriting the ladder logic programming model and GX Developer / GX Works2 software compatibility that defined the FX generation. Early FX1S units shipped with transistor (sink/source) and relay output variants, covering 10-, 14-, 20-, and 30-point I/O configurations. The internal CPU executes basic instructions at 0.55–0.7 µs per step, with program memory of 2,000 steps — sufficient for the majority of machine-level sequencing tasks it was designed to handle.

FX1S Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified production range of the Mitsubishi MELSEC FX1S series. Units are categorized by output type and I/O point count. All models share the same CPU core and program capacity (2,000 steps).

Relay Output Models (R-type):

FX1S-10MR-001: 6 DC inputs / 4 relay outputs, 100–240 VAC power supply, base unit.
FX1S-14MR-001: 8 DC inputs / 6 relay outputs, 100–240 VAC power supply, base unit.
FX1S-20MR-001: 12 DC inputs / 8 relay outputs, 100–240 VAC power supply, base unit.
FX1S-30MR-001: 16 DC inputs / 14 relay outputs, 100–240 VAC power supply, base unit.
FX1S-10MR-DS: 6 DC inputs / 4 relay outputs, 24 VDC power supply variant.
FX1S-14MR-DS: 8 DC inputs / 6 relay outputs, 24 VDC power supply variant.
FX1S-20MR-DS: 12 DC inputs / 8 relay outputs, 24 VDC power supply variant.
FX1S-30MR-DS: 16 DC inputs / 14 relay outputs, 24 VDC power supply variant.

Transistor Sink Output Models (T-type):

FX1S-10MT-001: 6 DC inputs / 4 transistor sink outputs, 100–240 VAC, high-speed pulse capable.
FX1S-14MT-001: 8 DC inputs / 6 transistor sink outputs, 100–240 VAC, supports 2-axis pulse output.
FX1S-20MT-001: 12 DC inputs / 8 transistor sink outputs, 100–240 VAC, supports positioning control.
FX1S-30MT-001: 16 DC inputs / 14 transistor sink outputs, 100–240 VAC, 100 kHz high-speed pulse output, full-featured base unit — the most widely deployed model in the FX1S range.
FX1S-10MT-DS: 6 DC inputs / 4 transistor sink outputs, 24 VDC power supply variant.
FX1S-14MT-DS: 8 DC inputs / 6 transistor sink outputs, 24 VDC power supply variant.
FX1S-20MT-DS: 12 DC inputs / 8 transistor sink outputs, 24 VDC power supply variant.
FX1S-30MT-DS: 16 DC inputs / 14 transistor sink outputs, 24 VDC power supply variant.

Communication & Option Boards (compatible with FX1S base units):

FX1S-232-BD: RS-232C communication board, mounts directly to FX1S base unit expansion slot.
FX1S-485-BD: RS-485 communication board, enables MODBUS RTU and Mitsubishi protocol networking.
FX1S-422-BD: RS-422 communication board for programming port expansion and HMI connection.