FUJI NP1PS-117R PLC CPU Module – MICREX-NX Series

FUJI NP1PS-117R – Central Processing Unit for MICREX-NX Distributed Control Architecture

The FUJI NP1PS-117R is a high-capacity CPU module engineered for the MICREX-NX programmable logic controller platform — FUJI Electric’s mid-to-large scale industrial automation backbone. With 117K-step program memory and a deterministic scan-cycle engine, this module functions as the computational arbiter for complex discrete sequencing, batch process control, and multi-axis coordination tasks. Its backplane bus interface connects directly to the NP1B-series base unit, enabling synchronous data exchange with I/O modules, communication adapters, and special-function cards at fixed, predictable latency intervals.

Unlike general-purpose embedded controllers, the NP1PS-117R is purpose-built for industrial determinism. Its execution pipeline separates input image refresh, program scan, output image write-back, and peripheral service into four discrete, non-overlapping phases. This architecture eliminates jitter introduced by interrupt-driven designs and guarantees that output state changes are bounded within a single scan cycle — a property that is non-negotiable in press control, robotic cell coordination, and high-speed packaging lines.

siemensplc.com maintains verified stock of the NP1PS-117R sourced through authenticated supply channels. Each unit is inspected prior to dispatch and ships with full export documentation from Xiamen, China to destinations worldwide.

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Technical Parameters

Hardware Logical Analysis

The NP1PS-117R’s internal architecture centers on a fixed-priority scan engine that processes the user program in a strictly ordered four-phase cycle: (1) Input Image Refresh — all physical input states are latched into the input image table at the start of each scan; (2) Program Execution — the CPU evaluates the 117K-step instruction set sequentially against the frozen input image, writing results to the output image table; (3) Output Image Write-Back — the resolved output image is transferred to physical output modules via the backplane bus; (4) Peripheral Service — loader port communication, self-diagnostics, and watchdog timer reset are handled in a bounded time slice.

This deterministic four-phase model means that no external interrupt can preempt program execution mid-scan, which is a deliberate design choice for process safety. The watchdog timer enforces a maximum scan-cycle ceiling; if the CPU fails to complete a scan within the configured limit, it transitions to a controlled STOP state and asserts a fault output — a behavior that prevents undefined actuator states in the field.

Backplane Bus Architecture: The NP1PS-117R communicates with co-resident modules (I/O, communication, special function) over the MICREX-NX internal parallel bus embedded in the NP1B base unit. Bus arbitration is handled by the CPU itself, which polls each module slot in a fixed sequence during the output write-back and peripheral service phases. This polling architecture eliminates bus contention and provides deterministic module response times — a property that distinguishes it from shared-medium fieldbus designs where collision avoidance introduces variable latency.

EMC Design: The module’s PCB layout employs ground-plane partitioning to isolate the CPU clock domain from the backplane bus transceiver circuitry. Ferrite bead filtering on power supply rails attenuates high-frequency conducted noise from adjacent switching power supplies. The module housing provides shielding continuity through the base unit chassis, contributing to the system’s IEC 61000-4-4 (EFT/Burst) and IEC 61000-4-5 (Surge) immunity ratings. These measures are particularly relevant in environments with variable-frequency drives, contactors, and arc welding equipment operating in close proximity.

Memory Architecture: Program memory (117K steps) and data memory are implemented in separate address spaces, preventing runaway data writes from corrupting the instruction store. Battery-backed SRAM retains the user program and data registers through power interruptions, eliminating the need for external memory cards in standard configurations. The R-suffix designation in NP1PS-117R indicates the presence of an onboard real-time clock (RTC) function, enabling time-stamped event logging and scheduled task execution without an external timekeeping module.

System Integration Benefits

• Deterministic Real-Time Response: Fixed four-phase scan architecture bounds worst-case output latency to a single scan cycle, enabling reliable coordination of time-sensitive actuators such as servo drives, proportional valves, and high-speed solenoids.
• Scalable I/O Expansion to 4,096 Points: The MICREX-NX backplane supports mixed I/O module configurations — digital, analog, temperature, pulse — within a single base unit, reducing panel wiring complexity and cabinet footprint.
• IEC 61131-3 Multi-Language Programming: Engineers can implement sequential machine logic in Ladder, state-machine logic in SFC, mathematical algorithms in Structured Text, and reusable function blocks in FBD within a single project file, reducing cross-team knowledge silos.
• Integrated RTC for Event Logging: The onboard real-time clock enables time-stamped fault recording and scheduled program execution, supporting traceability requirements in food processing, pharmaceutical, and ISO 9001-regulated environments.
• Watchdog-Enforced Fault Containment: Configurable scan-cycle watchdog timer transitions the CPU to a safe STOP state on program overrun, preventing undefined output states and protecting downstream machinery from uncontrolled actuation.
• FL-net / Ethernet Network Readiness: Communication modules added to the same base unit integrate the NP1PS-117R into plant-wide SCADA, MES, or peer-to-peer PLC networks without requiring a separate gateway device, reducing network topology complexity.
• Diagnostic Transparency via Loader Port: The RS-232C loader port provides real-time online monitoring of I/O states, data register values, and program execution status through SX-Programmer Expert, enabling rapid fault isolation without interrupting production.
• Long Platform Lifecycle: FUJI Electric’s MICREX-NX platform has an established multi-decade support commitment, reducing the risk of premature obsolescence and protecting capital investment in panel engineering and software development.
• Backward-Compatible Base Unit Ecosystem: The NP1B-series base units support mixed CPU and I/O module generations, allowing incremental system upgrades without full panel redesign.
• Compact Module Form Factor: At approximately 160 g, the NP1PS-117R occupies a single slot in the base unit, preserving adjacent slots for I/O and communication expansion in space-constrained control panels.

Quality Assurance & Global Logistics

Every FUJI NP1PS-117R unit stocked by siemensplc.com is procured through verified supply channels with full part traceability. Original FUJI Electric labeling, date codes, and serial numbers are intact on all units. Prior to dispatch, each module undergoes a visual inspection protocol covering connector pin integrity, housing condition, and label authenticity. Units are packed in anti-static ESD bags with humidity indicator cards, placed in rigid foam-lined cartons rated for international air freight handling.

Shipments originate from Xiamen, China — a major export hub with direct access to DHL, FedEx, and UPS international express networks. Standard transit times are 3–7 business days to most destinations in Europe, North America, Southeast Asia, and the Middle East. Full export documentation is provided with every shipment: commercial invoice, packing list, and certificate of origin. For orders requiring third-party inspection or specific customs documentation (e.g., Form E for ASEAN preferential tariff), these can be arranged at the quotation stage.

A 12-month warranty covers manufacturing defects from the date of shipment. Warranty claims are processed through a documented RMA procedure: the buyer submits a fault description, siemensplc.com issues an RMA number, and the defective unit is replaced or repaired at no additional cost for confirmed manufacturing defects. Technical support for installation, configuration, and compatibility questions is available via email and WhatsApp throughout the warranty period and beyond.

Contact Information

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Location: Xiamen, China
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