Mitsubishi FX1N-60MR-DS Programmable Controller

The Mitsubishi FX1N-60MR-DS is a main unit programmable logic controller from the MELSEC-F FX1N series, offering 60 integrated I/O points in a compact housing. With 36 DC inputs and 24 relay outputs, this micro PLC provides a balanced I/O configuration suitable for a wide range of small to medium-scale industrial control applications. The DC-powered unit combines CPU, power supply, and I/O in a single package, reducing hardware requirements, panel space, and system cost. The FX1N series is recognized for its high performance, expandable architecture, and user-friendly programming environment using Mitsubishi Electric's GX Works or GX Developer software platforms.

Technical Specifications

Key Features and Benefits

• 36 DC Inputs with 24 VDC Sink/Source Compatibility: The FX1N-60MR-DS provides 36 digital inputs that accept 24 VDC signals from a wide range of sensors, pushbuttons, limit switches, and other field devices. Input flexibility supports both sink and source configurations, accommodating various device types without requiring additional signal conditioning hardware.

• 24 Relay Outputs: The built-in relay outputs provide 24 Form A contacts capable of switching AC or DC loads up to the rated capacity. Relay outputs offer electrical isolation between the PLC logic and field devices, making them suitable for controlling solenoid valves, motor contactors, pilot lamps, and small relays directly without external interposing relays.

• Expandable Architecture: The FX1N-60MR-DS supports system expansion through additional I/O units and special function modules, allowing total I/O capacity to be increased to 128 points when using CC-Link remote I/O. This scalability enables the controller to grow with application requirements, accommodating future equipment upgrades without replacing the main unit.

• Dual 100 kHz Pulse Outputs: The controller can simultaneously output two independent 100 kHz pulse trains, enabling direct connection to stepper motor drives or servo amplifiers for positioning applications. Seven dedicated positioning instructions including zero return, absolute position readout, absolute/relative drive, and special pulse output control simplify programming of motion sequences without external motion controllers.

Functional Overview

The FX1N-60MR-DS executes user programs stored in the built-in 32,000‑step EEPROM memory, which retains programs without battery backup. The CPU scans inputs, executes the ladder logic program, and updates outputs in a deterministic cycle, with basic instruction execution time of 0.21 μs. The DC power supply eliminates the need for external power modules. The unit includes auxiliary relays (1,536 points), timers (138 points), and counters (67 points) for program logic. Interface options allow connection of programming panels and memory cassettes for program storage or transfer. The main unit occupies a small form factor of 175 × 90 × 75 mm, fitting easily into control enclosures with limited space.

Compatibility and Integration

The FX1N-60MR-DS is compatible with the FX1N expansion unit family, including additional digital I/O modules, analog I/O modules, temperature control modules, and communication adapters. Extension cables enable physical separation between the main unit and expansion modules. Program development uses Mitsubishi Electric's GX Works2 or GX Developer software running on a PC connected via a programming cable to the dedicated programming port. The controller supports networking via CC-Link, allowing integration into distributed control architectures with other MELSEC PLCs.

Installation and Configuration

The FX1N-60MR-DS mounts on a standard DIN rail or directly on a panel using mounting screws. The 24 VDC power supply must be within specified tolerance (12‑24 VDC depending on configuration); proper grounding is essential for noise immunity. Input and output devices are wired to the removable terminal blocks, which facilitate replacement and maintenance. Programming requires Mitsubishi Electric's GX Works2 or GX Developer software, with the program transferred via RS‑422 programming cable. The EEPROM memory retains the program without battery backup, eliminating battery maintenance concerns.

Maintenance and Reliability

The FX1N-60MR-DS requires minimal routine maintenance due to the EEPROM program memory, which retains data without battery power. Periodic inspection includes checking terminal tightness, verifying input voltages, and cleaning the enclosure as needed. Relay output contacts have a specified mechanical life exceeding 20 million operations; electrical life depends on switched load current. The unit meets CE certification and UL/cUL standards for global deployment, and RoHS compliance ensures environmental responsibility.

Conclusion

The Mitsubishi FX1N-60MR-DS main unit provides a flexible and cost-effective control solution for applications requiring 60 integrated I/O points. With 36 DC inputs, 24 relay outputs, 32,000 steps of program memory, and expansion to 128 I/O, the controller addresses the requirements of small to medium-scale automation tasks. The combination of high-speed instruction execution, dual 100 kHz pulse outputs, and proven reliability makes the FX1N-60MR-DS a suitable choice for machine builders and system integrators.