Mitsubishi FX1S-10MR-001 Programmable Logic Controller – MELSEC FX1S

Mitsubishi Electric FX1S-10MR-001: Fixed-Configuration Relay Output PLC for Deterministic Discrete Control

The FX1S-10MR-001 is a fixed-configuration programmable logic controller from Mitsubishi Electric’s MELSEC FX1S Series, integrating 6 DC sink/source inputs and 4 relay contact outputs within a 90 × 60 × 75 mm housing. It operates from an AC 100–240 V wide-range power supply, making it deployable across global grid standards without hardware modification. The onboard RS-422 programming port connects directly to GX Developer or GX Works2 via an FX-USB-AW adapter, supporting Ladder Diagram, Instruction List, and Structured Text under IEC 61131-3.

In a discrete control loop, the FX1S-10MR-001 functions as the sole execution node: it samples all 6 input channels at each scan cycle, evaluates the user program stored in 2,000-step flash memory, and drives the 4 relay outputs accordingly. The relay contacts are rated at 2 A / 250 V AC or 2 A / 30 V DC per point, with a mechanical endurance of 10 million operations and an electrical endurance of 200,000 operations at rated load — parameters that define its suitability for continuous-duty switching in packaging, conveyor, and HVAC interlock circuits. The scan cycle time is instruction-dependent; at 2,000 steps of basic ladder logic, typical scan times fall in the 0.55–1.0 ms range, which is adequate for relay-level sequencing but not for closed-loop motion control.

High-speed counter resources — two single-phase channels at up to 60 kHz or one 2-phase (A/B quadrature) channel at up to 30 kHz — extend the controller’s reach into encoder-based position verification and flow pulse counting without requiring an external counter module. Two interrupt inputs (X000, X001) allow sub-scan-cycle event response with a minimum interrupt latency of approximately 200 µs, enabling time-critical interlocks such as emergency stop acknowledgment or registration mark detection on a print line.

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Technical Parameters

Hardware Logical Analysis

Input Circuit Architecture: The FX1S-10MR-001 employs optocoupler-based galvanic isolation on all 6 input channels. Each input passes through a dedicated photocoupler with a nominal isolation voltage of 500 V AC between the field-side terminal and the internal logic bus. The input filter time constant is software-configurable from 1 ms to 60 ms per channel (default 10 ms), allowing the engineer to trade off noise rejection against response speed depending on the sensor type — proximity switches typically run at 5–10 ms, while mechanical contacts benefit from 20 ms debounce to suppress contact bounce transients.

Relay Output Driver Stage: The four relay outputs use electromechanical Form A contacts driven by a dedicated coil driver IC. Each output channel is individually fused at the PCB level with a self-resetting PTC thermistor, providing overcurrent protection without requiring manual fuse replacement after a wiring fault. The relay coil is driven from the internal 5 V logic rail through a flyback diode, suppressing the inductive kick at de-energization and protecting the driver transistor from voltage spikes that would otherwise exceed its BVCES rating.

EMC Design: The FX1S-10MR-001 meets EN 61000-4-2 (ESD immunity, ±4 kV contact / ±8 kV air), EN 61000-4-4 (electrical fast transient, ±2 kV on power lines), and EN 61000-4-5 (surge immunity, ±1 kV line-to-line). The PCB layout routes the high-frequency clock lines on inner layers with ground plane shielding above and below, minimizing radiated emissions. The AC power input section includes a common-mode choke and X/Y capacitor network to attenuate conducted interference in the 150 kHz–30 MHz band per EN 55011 Class A limits.

Flash EEPROM Program Retention: Program storage uses flash EEPROM with a specified data retention of 10 years at 25 °C and an endurance of 10,000 write cycles. Unlike earlier FX0S/FX0N models that required a lithium backup battery for program retention, the FX1S architecture eliminates the battery entirely — removing a scheduled maintenance item and the associated risk of program loss on battery depletion in unmanned installations.

Scan Cycle Determinism: The FX1S CPU executes a fixed three-phase scan: input refresh → program execution → output refresh. There is no background task preemption during normal scan execution. Interrupt routines (I00x, I10x) suspend the main scan at the current instruction boundary, execute the interrupt subroutine, and return — with a worst-case interrupt latency bounded by the longest single instruction execution time (approximately 20 µs for DDRVI pulse output instructions). This deterministic behavior is essential for applications where input-to-output response time must be guaranteed within a defined window.

System Integration Benefits

• Battery-Free Program Retention: Flash EEPROM storage eliminates scheduled battery replacement, reducing preventive maintenance intervals and the risk of program loss in remote or unmanned installations.
• Sink/Source Selectable Inputs: A single jumper on the input common terminal switches between NPN (sink) and PNP (source) sensor wiring, allowing the same hardware to interface with either sensor polarity without rewiring the field cabinet.
• Wide-Range AC Power Input: The 100–240 V AC power supply accepts both 50 Hz and 60 Hz grid frequencies, enabling the same controller SKU to be deployed in North America, Europe, and Asia without a separate power supply module.
• Onboard 24 V DC Sensor Supply: The integrated 300 mA service power output eliminates the need for a separate 24 V DC power supply in small panels, reducing component count, wiring complexity, and panel footprint.
• High-Speed Counter for Encoder Feedback: The 60 kHz single-phase counter supports incremental encoder position verification on conveyor indexing and filling machine applications without an external counter or positioning module.
• Interrupt-Driven Event Response: Sub-scan-cycle interrupt inputs (≈ 200 µs latency) allow the controller to respond to registration marks, emergency stop signals, or limit switch events faster than the main scan cycle permits, improving machine safety response time.
• GX Works2 Compatibility: Full support for Mitsubishi’s current IEC 61131-3 IDE enables structured programming, offline simulation, and seamless project migration to higher-tier FX3U or iQ-F series controllers as application complexity grows.
• DIN Rail Mounting: Standard 35 mm DIN rail clip with tool-free installation reduces panel assembly time; the 90 mm width occupies minimal horizontal rail space, leaving room for terminal blocks and circuit breakers in compact enclosures.
• Transparent Diagnostics via GX Works2: Online monitoring displays real-time coil/contact status, current timer and counter values, and data register contents without interrupting program execution, enabling rapid fault isolation during commissioning and maintenance.
• Proven FX Ecosystem Compatibility: The RS-422 port is protocol-compatible with Mitsubishi GOT1000/GOT2000 HMI series, enabling direct HMI connection without a gateway device and reducing system BOM cost.

Quality Assurance & Global Logistics

Every FX1S-10MR-001 unit supplied by siemensplc.com is sourced through verified original-equipment channels and undergoes a structured pre-shipment inspection protocol at our Xiamen, China facility. Inspection covers label and serial number authenticity verification, housing and connector integrity check, power-on functional test of all I/O points against Mitsubishi’s published electrical specifications, and RS-422 communication port verification using GX Works2 online connection. Units that do not pass all inspection checkpoints are quarantined and not shipped.

Packaging uses anti-static PE foam inserts within double-wall corrugated cartons, with silica gel desiccant packs to control humidity during ocean freight. Each shipment includes a packing list, commercial invoice, and certificate of origin. For air freight orders, DHL Express and FedEx International Priority services from Xiamen Gaoqi International Airport (XMN) typically achieve 3–5 business day delivery to major industrial hubs in Europe, North America, Southeast Asia, and the Middle East. Sea freight consolidation is available for bulk orders requiring cost-optimized logistics.

All units carry a 12-month warranty from the date of shipment, covering manufacturing defects and functional failures under normal operating conditions as defined by Mitsubishi Electric’s published environmental and electrical ratings. Warranty claims are processed with a target response time of 48 business hours from receipt of the defective unit at our Xiamen facility.

Contact Information

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