PLCs, Power Supplies & Others

This module functions as the central processing unit for Fuji distributed control systems. It executes complex ladder logic and structured text programs with deterministic execution times. Engineers rely on this controller for high-speed automation tasks including motion coordination and process regulation. The unit incorporates dual processors for separate handling of I/O scanning and program execution. Its robust design supports demanding applications in power generation, manufacturing, and water treatment.

Dual-Processor Architecture

The NP1PM-48R/48E contains two independent 32-bit microcontrollers operating in parallel. The first processor manages all I/O scanning and communication tasks exclusively. The second processor executes the user application program without I/O interruptions. This architecture ensures maximum program execution speed and deterministic scan times. Consequently, critical control loops maintain consistent performance regardless of I/O traffic.

Memory Configuration and Storage Capacity

This CPU module provides 1 MB of battery-backed RAM for user program and data retention. It also includes 512 KB of flash memory for firmware and configuration storage. The module offers an additional 128 KB of EEPROM for critical parameter backup. The battery maintains all RAM contents for 30 days without external power. These extensive memory resources accommodate large, complex automation programs.

Processing Speed and Scan Time

Each processor operates at 50 MHz for rapid instruction execution. The module executes basic logic instructions in under 0.3 microseconds per operation. Typical scan times range from 1 to 3 milliseconds for medium-sized applications. The dual-processor design minimizes scan time jitter and improves motion control precision. This high-speed performance suits packaging machinery, printing presses, and high-speed assembly lines.

Physical Dimensions and Mounting

The NP1PM-48R/48E measures 12.7 cm in width, 25.4 cm in height, and 20.3 cm in depth. It weighs approximately 1.4 kg, which ensures stable placement within the rack assembly. A die-cast aluminum housing provides excellent thermal management and EMI shielding. The unit mounts directly into standard 19-inch racks or compatible PLC backplanes. Its front panel contains status LEDs and communication port access.

Communication Interfaces and Expansion

This module provides two RS-232 ports for programming and operator interface connections. It also includes one RS-485 port for networking with remote I/O and other controllers. A dedicated Ethernet port enables connection to plant-wide information networks. The CPU supports up to 16 expansion modules through the backplane bus. This scalability accommodates growing system requirements without processor replacement.

Internal Components and Energy Storage

The printed circuit board contains two CPUs, four SRAM chips, and a real-time clock module. A 0.5 F supercapacitor provides short-term power for the real-time clock. The module also includes a lithium battery for long-term RAM data retention. An onboard watchdog timer resets the system upon software or hardware faults. These components work together for reliable, uninterrupted process control.

Power Specifications and Protection

The NP1PM-48R/48E draws 500 mA from the 5 VDC backplane under full load. A separate 24 VDC input powers the battery charging and real-time clock circuits. The module includes comprehensive power supply monitoring and brown-out detection. Hardware-based trap handling captures illegal instruction and memory access errors. These protective features ensure safe system operation during abnormal conditions.

Status Indication and Diagnostic Functions

Multiple front-panel LEDs display power, run, fault, and communication status clearly. Green LEDs confirm normal operation while red LEDs signal specific error conditions. The module logs fault events with time-stamped entries in non-volatile memory. It also provides a dedicated alarm output for external fault annunciation. Maintenance personnel can troubleshoot issues rapidly using the diagnostic data.

Environmental Specifications and Compliance

The NP1PM-48R/48E operates reliably across temperatures from 0°C to 55°C. It withstands humidity levels up to 95% non-condensing without performance degradation. The module complies with IEC 61131-2 standards for programmable controllers. Vibration tolerance meets IEC 60068-2-6 requirements for industrial installations. This robust construction ensures long-term reliability in demanding factory and process environments.

Technical Data Sheet – Fuji NP1PM-48R/48E

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