Mitsubishi FX1N-24MT-001 Replacement for MELSEC FX1N

Product Overview

Mitsubishi FX1N-24MT-001 Replacement for MELSEC FX1N: Seamless Transition & Smooth System Upgrade

The Mitsubishi Electric FX1N-24MT-001 is a compact transistor output PLC from the MELSEC FX1N series, featuring 24 I/O points (14 inputs / 10 transistor outputs), a built-in RS-422 programming port, and a maximum program capacity of 8,000 steps. As this model approaches end-of-life in many installed base environments, engineering teams across manufacturing, packaging, material handling, and process control are actively seeking a verified replacement or upgrade path that preserves existing wiring, ladder logic, and control cabinet layouts.

TOPNLMS maintains ready stock of the FX1N-24MT-001 and its direct functional equivalents, enabling procurement teams to source a tested, traceable unit with a 12-month warranty and fast international shipping from Xiamen, China.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from an aging FX1N-24MT-001 installation rarely involves the CPU alone. In practice, field engineers replacing this unit also evaluate the surrounding system architecture to ensure every component communicates correctly and fits within the existing control cabinet envelope.

For sites running FX1N expansion I/O — such as the FX1N-8EX-ES/UL digital input expansion or the FX1N-8EYT-ESS/UL transistor output expansion — the replacement FX1N-24MT-001 connects via the same right-side expansion bus connector, requiring no rewiring of field devices. Where additional analog capability is needed during the upgrade, the FX1N-2AD-BD analog input board mounts directly to the CPU’s left-side option slot, preserving cabinet space.

Communication continuity is a critical concern on sites using MELSEC protocol or Modbus RTU over RS-422. The FX1N-232-BD RS-232C communication board and the FX1N-485-BD RS-485 board are both compatible with the replacement unit, allowing existing SCADA, HMI, or inverter communication links to remain intact without protocol conversion. For sites that have already standardized on CC-Link fieldbus, the FX2N-16CCL-M CC-Link master module can be retained on the same rack when migrating to an FX3U-based platform.

Power supply integrity is equally important. Many FX1N-24MT-001 installations share a 24 VDC rail with proximity sensors, solenoid valves, and indicator lights. The replacement unit draws the same 24 VDC logic supply, so existing Mitsubishi PS-5R or equivalent DIN-rail power supplies do not require resizing. Where the cabinet uses a dedicated PLC power module such as the FX3U-1PSU-5V, this can be retained as-is during an FX3U upgrade migration.

For programming and commissioning, engineers connecting to the replacement FX1N-24MT-001 via GX Works2 will use the standard SC-09 RS-422 programming cable or the USB-SC09-FX USB-to-RS422 adapter — both of which are stocked by TOPNLMS and can be shipped alongside the CPU to minimize on-site preparation time. HMI panels such as the Mitsubishi GOT1000 GT1020 or GT1030 series, already wired to the FX1N’s RS-422 port, will continue to operate without display program changes in most retrofit scenarios.

Where the original installation includes a FX1N-CNV-BD connector conversion board or a FX1N-EEPROM-8L memory cassette for program backup, these accessories remain compatible with the replacement unit, protecting the customer’s existing program archive and reducing re-commissioning time on the factory floor.

Retrofit Guidance FAQ

Q: Can I reuse my existing terminal block wiring when replacing the FX1N-24MT-001?
A: Yes. The FX1N-24MT-001 uses a standard screw terminal block with the same I/O pin assignment as all FX1N-24MT variants. Field wiring for input commons (S/S), 24 VDC sensor supply, and transistor output commons (COM) can be reconnected directly to the replacement unit without modification.

Q: Will my existing GX Developer or GX Works2 ladder program run on the replacement unit without modification?
A: In most cases, yes. Programs written for the FX1N-24MT-001 are fully compatible with a replacement FX1N-24MT-001. If migrating to an FX3U platform, a GX Works2 project conversion is required, but the core ladder logic, timer/counter settings, and data register assignments are preserved automatically by the conversion wizard.

Q: Is the RS-422 communication port on the replacement unit pin-compatible with my existing HMI or SCADA cable?
A: Yes. The replacement FX1N-24MT-001 uses the same mini-DIN 8-pin RS-422 port. Existing programming cables and HMI communication cables connect without modification. Baud rate, station number, and protocol settings are retained in the program and do not need to be reconfigured.

Q: How much physical space does the replacement unit require in the control cabinet?
A: The FX1N-24MT-001 has a standard DIN-rail footprint of 90 mm (H) × 150 mm (W) × 75 mm (D). The replacement unit matches these dimensions exactly, fitting into the existing DIN-rail slot without cabinet modification or additional mounting hardware.

Q: What is the recommended procedure for replacing the FX1N-24MT-001 in a live production environment?
A: TOPNLMS recommends: (1) back up the existing program using GX Works2 or the FX1N-EEPROM-8L memory cassette; (2) power down the cabinet and label all terminal block connections; (3) remove the legacy unit and install the replacement on the same DIN-rail position; (4) reconnect all field wiring using the terminal labels; (5) restore the program via USB-SC09-FX or SC-09 cable; (6) perform a cold-start I/O check before resuming production. Total changeover time is typically 30–90 minutes for a trained technician.

Q: Does the replacement unit support the same expansion modules as the original FX1N-24MT-001?
A: Yes. All FX1N-series expansion modules — including digital I/O expansions, analog boards, and communication boards — connect via the same right-side expansion bus. No expansion module replacement is required as part of the CPU swap.

Warranty Assurance

Every FX1N-24MT-001 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each unit undergoes a functional power-on test and I/O verification check. Units are shipped in anti-static packaging with individual serial number documentation to support traceability requirements in regulated manufacturing environments.

In the event of a warranty claim, TOPNLMS provides a replacement unit or full refund within the warranty period. Our technical support team responds to after-sales inquiries within 24 business hours. For urgent production-line situations, expedited shipping options are available to minimize downtime exposure.

Procurement teams can request a test report, inspection certificate, or product photograph prior to order confirmation. We accept T/T bank transfer, PayPal, and trade assurance payment terms. Minimum order quantity is 1 unit, with volume pricing available for orders of 5 units or more.

TOPNLMS ships globally from Xiamen, China, with typical lead times of 3–7 business days for in-stock items. Express courier options (DHL, FedEx, UPS) are available for time-critical replacement orders.