Mitsubishi FX1N-40MR-JY331BA8302H PLC – MELSEC FX1N Series

Mitsubishi FX1N-40MR-JY331BA8302H — 40-Point Relay Output PLC for Deterministic Discrete Control

The Mitsubishi FX1N-40MR-JY331BA8302H is a fixed-configuration programmable logic controller from Mitsubishi Electric’s MELSEC FX1N platform, engineered for small-to-mid-scale discrete manufacturing automation. With a 24-input / 16-output relay architecture, AC 100–240 V power supply, and an 8,000-step program memory, this unit occupies a well-defined position in the FX1N product matrix: maximum I/O density within the compact DIN-rail form factor, relay output switching for resistive and inductive loads up to 2 A per point, and native RS-422 communication for direct HMI and peripheral integration without additional interface hardware.

The suffix JY331BA8302H is Mitsubishi Electric’s internal production-revision identifier, encoding the hardware revision level and factory batch traceability code. It does not alter the functional specification relative to the standard FX1N-40MR-001 catalog unit; however, procurement teams working against a specific BOM or MES traceability requirement should retain the full part number to ensure revision-level consistency across replacement units.

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Technical Parameters

Hardware Logical Analysis

Relay Output Contact Architecture: Each of the 16 output points on the FX1N-40MR-JY331BA8302H uses an independent Form A (normally open) relay contact rated at 2 A / 250 VAC or 2 A / 30 VDC. The output commons are grouped in banks of 4 or 8 points, allowing mixed-voltage load circuits within a single unit without external isolation relays. The relay coil drive circuit is isolated from the CPU logic bus via an optocoupler stage, providing a minimum 500 V isolation barrier between the control-side logic and the field-side load circuit. This architecture eliminates the need for external surge suppressors on inductive loads in most standard applications, as the relay contact itself absorbs the back-EMF transient at the mechanical break point.

Input Circuit Opto-Isolation: All 24 digital inputs employ phototransistor-based optical isolation with a nominal input threshold of 4.5 mA at 24 VDC. The input filter time constant is software-configurable from 1 ms to 60 ms per input group, enabling the same hardware to serve both high-frequency pulse capture (e.g., proximity sensor counting) and noise-immune slow-signal applications (e.g., limit switches in high-EMI environments). The input commons are internally connected, simplifying field wiring for sink-type (NPN) sensor configurations standard in Asian and European machine-building practice.

EMC Design and Noise Immunity: The FX1N platform was designed to IEC 61000-4 series immunity levels. The power supply section incorporates a common-mode choke and X/Y-class capacitor network to attenuate conducted interference on the AC supply line. The CPU board uses a ground-plane layer strategy with separate analog and digital ground domains, joined at a single star point to prevent ground loop currents from coupling into the logic circuitry. Radiated immunity is rated to 10 V/m across 80 MHz–1 GHz per IEC 61000-4-3, making the unit suitable for deployment adjacent to variable-frequency drives and high-current switching contactors without additional shielding enclosures in most panel configurations.

Program Execution and Scan Cycle: The FX1N CPU executes a fixed sequential scan: input refresh → program execution → output refresh → communication service. At 8,000 steps with a 0.55 µs basic instruction time, the worst-case program execution time for a fully loaded program is approximately 4.4 ms, yielding a total scan cycle typically in the 5–10 ms range depending on communication load. The deterministic scan architecture ensures that output response latency is bounded and predictable — a critical requirement for relay-sequenced interlock logic where timing margins must be verified against mechanical actuator response times.

Battery-Backed Memory Retention: Program memory is stored in EEPROM (no battery required for program retention). The battery (CR2032 lithium coin cell) maintains the real-time clock and retentive data registers (D0–D127 by default, configurable) during power loss. Battery life is rated at approximately 5 years under normal operating conditions. The CPU generates a low-battery warning flag (M8006) accessible in the ladder program, enabling the application to trigger a maintenance alarm before data loss occurs.

System Integration Benefits

• Direct HMI Connectivity via RS-422: The built-in RS-422 port supports the FX communication protocol at baud rates up to 19,200 bps, enabling direct connection to Mitsubishi GOT1000/GOT2000 HMI panels and a wide range of third-party HMIs without an additional communication module, reducing BOM cost and panel wiring complexity.
• Modular I/O Expansion to 128 Points: Up to 8 FX1N expansion modules (8EX input or 8EYR relay output) can be connected via the right-side expansion bus connector, scaling the system to 128 additional I/O points without changing the CPU or programming environment — protecting the software investment across machine variants.
• Analog Signal Integration via BD Option Boards: The FX1N-2AD-BD (2-channel analog input) and FX1N-1DA-BD (1-channel analog output) option boards mount directly onto the CPU unit, providing analog capability without consuming expansion module slots — a significant advantage in space-constrained panel designs.
• High-Speed Counter for Encoder Feedback: Six built-in high-speed counter channels (max 60 kHz single-phase, 30 kHz two-phase) support incremental encoder position feedback for simple positioning tasks, eliminating the need for a dedicated positioning module in applications with moderate speed and accuracy requirements.
• GX Works2 Structured Programming Support: Full compatibility with Mitsubishi’s GX Works2 IDE enables structured text, function block diagram, and instruction list programming in addition to ladder diagram, supporting modular software architecture and code reuse across FX1N, FX3G, and FX3U platforms.
• CC-Link Network Participation via Master Module: The FX1N-16CCL-M master module enables the FX1N-40MR to act as a CC-Link master, coordinating up to 16 remote I/O stations across a 10 Mbps fieldbus — extending the system’s physical reach without proportional increases in panel wiring cost.
• Deterministic Interlock Logic Execution: The fixed-scan CPU architecture guarantees that safety-critical interlock rungs execute within a known, bounded time window every scan cycle. This property is essential for machinery directive compliance where interlock response time must be documented and verified against the risk assessment.
• Broad Third-Party HMI and SCADA Compatibility: The FX protocol is supported by virtually all major SCADA and HMI platforms (Wonderware, Ignition, Weintek, Proface, etc.) via RS-422 or RS-232 adapters, ensuring the FX1N-40MR-JY331BA8302H integrates into existing plant communication architectures without custom driver development.

Quality Assurance & Global Logistics

Every FX1N-40MR-JY331BA8302H unit dispatched from our Xiamen, China facility is a genuine Mitsubishi Electric product sourced through verified industrial supply channels. Prior to shipment, each unit undergoes a structured pre-delivery inspection protocol: visual examination of housing, label, and terminal block integrity; verification of the production revision code against the purchase documentation; and a power-on functional check confirming CPU RUN status, I/O indicator response, and communication port activity.

Units are packaged in anti-static polyethylene foam inserts within double-wall corrugated cartons, with corner protectors and moisture-barrier desiccant sachets included for long-haul air freight. Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared to customs standards for major destination markets including the EU, USA, Southeast Asia, and the Middle East, minimizing clearance delays at destination ports.

Standard dispatch from Xiamen is within 1–3 business days of order confirmation. International express delivery via DHL, FedEx, or UPS typically achieves door-to-door transit times of 3–7 business days to most global destinations. For time-critical plant shutdowns or emergency replacement scenarios, same-day dispatch can be arranged for orders confirmed before 14:00 CST. All shipments include full tracking and are covered by a 12-month warranty from the date of shipment, with direct technical support from our engineering team throughout the warranty period.

Contact Information

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