Mitsubishi FX2N-8EYR PLC Extension Module – FX2N Series

FX2N-8EYR: 8-Point Relay Output Extension Module for Mitsubishi FX2N PLC Systems

The Mitsubishi Electric FX2N-8EYR is an 8-point relay contact output expansion module engineered for the FX2N series programmable logic controller platform. Within a discrete control loop, this module occupies the final output stage — translating CPU-resolved logic states into galvanically isolated relay contact closures capable of switching both AC and DC loads. Its role is not peripheral; in any FX2N-based control architecture, the output module is the physical boundary between deterministic PLC logic and field-level actuators such as contactors, solenoid valves, indicator lamps, and motor starters.

Unlike transistor output variants (FX2N-8EYT), the relay contact architecture of the FX2N-8EYR provides inherent electrical isolation between the PLC’s internal 24 VDC logic bus and the load circuit. Each output point is driven by an independent electromechanical relay, with contact ratings sufficient for direct switching of inductive AC loads — a requirement that transistor outputs cannot satisfy without additional interface relays. This makes the FX2N-8EYR the preferred output module in applications involving mixed-voltage field devices, legacy AC actuators, or environments where load-side transients must be prevented from coupling back into the control bus.

The module connects to the FX2N base unit via the proprietary FX2N extension bus connector, drawing its logic power from the base unit’s internal 5 VDC bus. No external power supply is required for module operation. Up to eight FX2N-8EYR modules can be cascaded on a single base unit, subject to the base unit’s total I/O expansion budget and 5 VDC bus current capacity. Each module consumes approximately 30 mA from the 5 VDC bus, a figure that must be accounted for in system power budgeting when multiple extension modules are deployed.

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Technical Parameters

Hardware Logical Analysis

Relay Contact Isolation Architecture: Each of the eight output channels in the FX2N-8EYR is driven by a dedicated electromechanical relay. The relay coil is energized by the module’s internal drive circuit, which receives switching commands from the FX2N extension bus. The contact circuit is entirely separate from the coil circuit, providing galvanic isolation with a dielectric withstand voltage of 1,500 VAC between the output contact and the internal logic circuit. This isolation architecture prevents load-side voltage transients — common in inductive switching environments — from propagating into the PLC’s 5 VDC logic bus or corrupting adjacent I/O channels.

EMC Design Considerations: The relay contact switching mechanism inherently generates electromagnetic emissions at the moment of contact make and break, particularly when switching inductive loads. Mitsubishi Electric addresses this through the module’s PCB layout, which routes high-current contact traces away from the logic bus interface. For installations in high-EMI environments, external RC snubber circuits or varistors across inductive loads are recommended to suppress contact arc energy and extend relay electrical life beyond the rated 100,000 operations.

Extension Bus Interface Logic: The FX2N-8EYR communicates with the base unit CPU via the FX2N proprietary parallel extension bus. Output state data is latched into the module’s output register on each PLC scan cycle. The module does not perform independent processing; it functions as a pure output slave, with all logic resolution occurring in the base unit CPU. This architecture ensures that output state changes are synchronized with the PLC scan cycle, providing deterministic output timing relative to the program execution sequence.

Common Output Terminal Configuration: The eight relay contacts share a common terminal (COM), which must be connected to the load supply return or neutral. This common-COM architecture simplifies wiring for loads sharing the same supply voltage but requires careful planning when mixing load voltages across output points. In mixed-voltage applications, the output points must be grouped by load voltage, with separate COM connections for each voltage group — a wiring constraint that must be reflected in the panel design.

Thermal Management: At full load (2 A per point, all 8 points active), the module dissipates approximately 1.5 W internally. The module relies on natural convection cooling within the control panel enclosure. Mitsubishi Electric specifies a maximum ambient operating temperature of 55 °C for the module, which must be derated in high-density panel installations where internal enclosure temperatures may exceed ambient.

System Integration Benefits

• Direct AC Load Switching: Relay contacts rated at 240 VAC / 2 A allow direct connection of AC solenoids, contactors, and indicator lamps without intermediate interface relays, reducing panel component count and wiring complexity.
• Mixed-Voltage Field Compatibility: A single FX2N-8EYR can switch both AC and DC loads (within voltage and current ratings), accommodating field devices operating at different supply voltages within the same output module.
• Galvanic Isolation for Signal Integrity: Relay contact isolation prevents ground loops and common-mode noise from field wiring from affecting the PLC’s internal logic bus, maintaining signal integrity in electrically noisy industrial environments.
• Deterministic Output Synchronization: Output state changes are latched on each PLC scan cycle, ensuring that output transitions are precisely aligned with the program execution sequence and not subject to asynchronous delays.
• Scalable I/O Expansion: Up to eight FX2N-8EYR modules can be added to a single FX2N base unit, providing up to 64 additional relay output points without requiring a larger base unit or additional CPU hardware.
• No External Power Requirement: The module draws its operating power entirely from the FX2N extension bus 5 VDC supply, eliminating the need for a dedicated external power supply and simplifying panel power distribution design.
• Diagnostic Transparency via GX Works2: Output state monitoring is available in real time through GX Developer and GX Works2 programming software, enabling engineers to verify output states during commissioning and fault diagnosis without additional test equipment.
• Standardized Terminal Block Wiring: M3 screw terminal blocks accept standard 0.3–2.5 mm² wire cross-sections, compatible with common industrial wiring practices and enabling straightforward integration into existing panel wiring standards.
• Proven Platform Longevity: The FX2N series has an extensive installed base in global manufacturing facilities. Spare parts availability and engineering familiarity with the platform reduce maintenance risk and support long-term system lifecycle management.
• CE and UL Certification: Dual certification supports deployment in both European and North American markets without requiring additional compliance testing at the system level.

Quality Assurance & Global Logistics

Every FX2N-8EYR unit supplied through siemensplc.com is sourced as genuine Mitsubishi Electric original equipment. Units are not remanufactured, relabeled, or third-party compatible substitutes. Each module undergoes a structured pre-shipment inspection protocol:

• Label and date code authenticity verification against Mitsubishi Electric production records
• Visual inspection for physical damage, terminal condition, and connector integrity
• Functional power-on verification where test fixtures are available
• Anti-static packaging with humidity indicator cards for moisture-sensitive components
• Traceability documentation (batch number, inspection record) available upon request for quality-critical procurement

Shipments originate from our warehouse in Xiamen, China, a major logistics hub with direct access to international freight carriers including DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard international delivery times are 3–7 business days to most destinations in Europe, North America, Southeast Asia, and the Middle East. Expedited same-day dispatch is available for orders confirmed before 14:00 CST. All shipments include tracking numbers issued within 24 hours of dispatch. Export documentation, including commercial invoices and packing lists compliant with customs requirements, is prepared for every international shipment. A 12-month warranty from the date of shipment covers manufacturing defects under normal operating conditions.

Contact Information

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