Mitsubishi FX2N-16MR-001 PLC Module – FX2N Series

Mitsubishi FX2N-16MR-001: Relay-Output Compact PLC for Deterministic Discrete Control

The FX2N-16MR-001 is a fixed-configuration programmable logic controller from Mitsubishi Electric’s FX2N product family. It integrates 8 DC sink/source inputs and 8 independent relay output contacts into a single DIN-rail-mounted housing, powered directly from a 100–240 VAC supply. Within a control loop, this unit functions as the primary execution node: it samples field-side digital signals, executes stored ladder or instruction-list logic at a fixed scan cycle, and drives output coils that switch inductive, resistive, or lamp loads without requiring interposing relays. The relay output architecture makes the module inherently load-agnostic — each contact can switch AC or DC loads up to 2 A at 250 VAC / 30 VDC, eliminating the voltage-type dependency that constrains transistor-output variants.

The FX2N series occupies the mid-range tier of Mitsubishi Electric’s legacy compact PLC portfolio. Its instruction set covers 200+ basic and applied instructions, including PID loop control, high-speed counter processing (up to 60 kHz on dedicated inputs), and pulse-width modulation output via special function registers. The FX2N-16MR-001 supports program memory of 8,000 steps natively, expandable to 16,000 steps with an FX2N-ROM-E1 or FX2N-EEPROM-8L memory cassette. This capacity is sufficient for multi-axis sequencing, interlocked safety logic, and recipe-based process control in machines with moderate I/O density.

The unit’s backplane architecture uses Mitsubishi’s proprietary FX bus, which supports synchronous data exchange between the CPU base unit and up to 8 extension modules or blocks. Maximum system I/O reaches 256 points when FX2N-EX/EY expansion blocks are chained. The internal power supply delivers 5 VDC at 300 mA to the extension bus, constraining the number of high-current analog modules that can be added without an external FX2N-CNV-BD power supplement. Engineers designing dense analog-heavy panels should account for this bus current budget during system sizing.

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Technical Parameters

Hardware Logical Analysis

The FX2N-16MR-001’s input circuit employs optical isolation on all 8 input channels. Each input transistor drives an LED within a photocoupler, creating a galvanic barrier rated at 500 VAC between the field wiring and the CPU logic bus. This isolation topology prevents ground-loop currents — common in long cable runs across machine frames — from injecting noise into the microprocessor’s address and data lines. The input filter time constant is software-configurable from 1 ms to 60 ms per channel, allowing engineers to trade off noise rejection against response speed depending on whether the input source is a mechanical limit switch (which benefits from debounce filtering) or a proximity sensor (which requires faster response).

The relay output stage uses independent mechanical contacts per output point, with each contact sharing a common terminal within a group of 4. This grouped-common architecture means mixed-voltage loads — for example, 24 VDC solenoids on Y0–Y3 and 220 VAC contactors on Y4–Y7 — can coexist in the same module without cross-contamination, provided the commons are wired to their respective supply rails. Relay contact life is rated at 200,000 operations under rated resistive load, and 100,000 operations under inductive load at rated current. For applications with high switching frequency, the FX2N-16MT-001 (transistor output) is the appropriate variant; the relay version is optimized for low-frequency, high-load-current switching.

The CPU executes a fixed sequential scan: input refresh → program execution → output refresh → peripheral service. At 0.08 µs per basic instruction, an 8,000-step program completes execution in approximately 0.64 ms under ideal conditions, yielding a total scan time typically in the 1–5 ms range depending on applied instruction mix and communication overhead. This deterministic scan behavior is critical for interlocked safety sequences where output state must be predictable within a bounded time window. The FX2N does not implement a preemptive interrupt architecture for standard I/O; however, interrupt input pointers (I00x–I50x) allow six hardware interrupt routines to break the main scan cycle, enabling sub-millisecond response to high-priority field events such as emergency stop signals or encoder index pulses.

EMC performance is achieved through a combination of hardware and layout measures: the power supply section uses a common-mode choke on the AC input lines to attenuate conducted emissions, and the PCB ground plane is segmented to isolate the switching power supply return from the logic ground. The unit complies with EN 61131-2 for programmable controllers and EN 55011 Class A for industrial electromagnetic emissions, making it suitable for installation in environments with variable-frequency drives, welding equipment, and other high-EMI sources — provided standard panel wiring practices (shielded cables, separated power and signal runs) are observed.

System Integration Benefits

• Deterministic scan cycle: Fixed sequential execution model guarantees output state is updated within a bounded scan period, enabling reliable interlocking between this unit and downstream actuators or safety relays without additional timing margins.
• Mixed-voltage relay outputs: Independent contact commons per output group allow AC and DC loads to coexist in a single module, reducing panel wiring complexity and eliminating the need for separate relay interface modules.
• Scalable I/O architecture: The FX bus supports up to 8 extension units, scaling the system to 256 I/O points without changing the CPU or programming environment, protecting the engineering investment in existing ladder programs.
• High-speed counter inputs: Dedicated high-speed counter inputs on X0–X5 (up to 60 kHz) allow direct connection of incremental encoders or pulse-output flow meters without external counter modules, reducing BOM cost and panel footprint.
• Interrupt-driven event handling: Six hardware interrupt pointers enable sub-scan-cycle response to critical field events, supporting applications such as registration mark detection in printing machinery or emergency stop processing in press control.
• Broad communication expansion: The RS-422 programming port and optional FX2N-232-BD / 485-BD communication boards allow integration with HMI panels, SCADA systems, and third-party devices using Mitsubishi protocol, Modbus RTU, or free-protocol serial communication.
• PID and analog control: Built-in PID instruction (P.PID) combined with FX2N-4AD/4DA analog modules enables closed-loop process control — temperature, pressure, flow — without a separate process controller, consolidating control architecture onto a single CPU.
• Diagnostic transparency: Special auxiliary relays (M8000–M8255) and data registers (D8000–D8255) expose real-time system status — scan time, battery voltage, I/O error flags, communication status — directly readable from GX Developer or GX Works2 without additional diagnostic hardware.
• Proven software migration path: Existing FX2N ladder programs can be imported into GX Works2 and migrated to FX3U or FX5U platforms using built-in conversion tools, protecting software assets when hardware is upgraded.
• Wide operating temperature range: 0–55 °C operating range covers the majority of industrial panel environments without forced cooling, reducing maintenance requirements associated with fan-cooled enclosures.

Quality Assurance & Global Logistics

Every FX2N-16MR-001 unit supplied by siemensplc.com is sourced as genuine Mitsubishi Electric product. Units are verified against Mitsubishi’s original packaging markings, date codes, and PCB revision labels prior to listing. Functional verification includes power-on self-test confirmation, I/O point continuity check, and communication port response test using GX Developer. Batch traceability documentation — including supplier invoice references and inspection records — is retained and available upon request for quality-critical procurement processes.

Logistics operations are based in Xiamen, China, a major export hub with direct access to international freight forwarders and express courier networks. Standard shipment options include DHL Express (3–5 business days to most destinations), FedEx International Priority, and UPS Worldwide Express. For large-volume orders, sea freight consolidation via Xiamen Port is available with full export documentation including commercial invoice, packing list, and certificate of origin. All shipments are packed with anti-static foam inserts and moisture-barrier bags to protect sensitive electronic components during transit. Export classification and HS code documentation are prepared for each shipment to facilitate smooth customs clearance in the destination country.

A 12-month warranty from the date of shipment covers manufacturing defects and functional failures under normal operating conditions. Warranty claims are processed with a target response time of 2 business days. Replacement units are dispatched from Xiamen stock upon claim approval, minimizing production downtime for the end customer.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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