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This digital CPU module serves as the central processor for FUJI MICREX-SX automation systems. It executes user application logic for industrial machine and process control. Therefore, it delivers reliable real-time control for manufacturing and production applications.
Physical and Processor Specifications
The FUJI NP1AX04-MR measures 13.0 cm in length and 9.5 cm in width. Moreover, its module weight equals approximately 0.42 kg for rack mounting. A single 48-pin male connector links this CPU to the MICREX-SX backplane. Additionally, the processor includes built-in digital I/O and communication ports.
| Parameter | Specification |
|---|---|
| Brand | FUJI Electric |
| Full Model | NP1AX04-MR |
| Category | Digital CPU Module (MICREX-SX) |
| Dimensions (L x W x H) | 13.0 cm x 9.5 cm x 6.0 cm (5.12″ x 3.74″ x 2.36″) |
| Module Weight | 0.42 kg (0.93 lbs) |
| Backplane Interface | 1 x 48-pin Male Connector (MICREX-SX Rack) |
| Power Supply Input | 5 VDC from Backplane (1.0 A Typical) |
| Power Consumption | 5.0 W (Typical) |
| Processor Type | 32-bit RISC (40 MHz) |
| Program Memory | 64 kB RAM (Battery Backed) |
| Data Memory | 32 kB RAM (Retentive with Battery) |
| Backup Battery | Internal Lithium (3V, 5 Year Life) |
| Execution Speed | 0.3 µs per Boolean Instruction |
| Built-In Digital Inputs | 8 Channels (24 VDC, Sink/Source) |
| Input Response Time | 4 ms (Typical) |
| Built-In Digital Outputs | 4 Channels (Relay, 2A) |
| Output Response Time | 10 ms (Typical) |
| Built-In Communication Ports | 1 x RS-232 (Programming) + 1 x RS-485 (Modbus RTU) |
| Supported Protocols | Modbus RTU (Master/Slave) + FUJI Proprietary |
| Baud Rate Range | 9600 to 115200 baud |
| Maximum Digital I/O | 512 Points (with Expansions) |
| Maximum Analog I/O | 64 Channels (with Expansions) |
| Programming Software | MICREX-SX Standard or D300win |
| Programming Languages | Ladder Diagram (LD) + Instruction List (IL) + FBD |
| On-Board Components | 1 CPU IC + 3 Memory Chips + 2 UARTs + 1 RTC + 8 Input Optocouplers + 4 Relay Drivers + 4 Flyback Diodes + 6 Protection Diodes + 1 Voltage Regulator |
| Energy Storage | 3 x 100 µF Electrolytic Capacitors (35V) + 2 x 10 µF Tantalum (25V) + 1 x CR2032 Backup Battery |
| Battery Backup Time | 5 Years (Typical for RAM and RTC Retention) |
| Scan Time | 1.5 ms for 8 kB of Ladder Logic |
| Operating Temperature | 0°C to +55°C (32°F to 131°F) |
| Mounting Type | MICREX-SX PLC Rack (Single Slot) |
| Status Indicators | 1 Green LED (Power) + 1 Green LED (Run) + 1 Red LED (Fault) + 1 Yellow LED (Battery Low) + 8 Green LEDs (Inputs) + 4 Green LEDs (Outputs) + 2 Yellow LEDs (Port Activity) |
Built-In I/O and Processing Features
The FUJI NP1AX04-MR includes 8 digital inputs and 4 relay outputs onboard. Specifically, the inputs accept 24 VDC signals from standard industrial sensors. In addition, the relay outputs drive small solenoids, contactors, and indicator lamps directly. Moreover, the execution speed of 0.3 µs per Boolean instruction ensures fast response. Furthermore, a lithium battery retains RAM contents for up to five years. Consequently, this CPU operates as a complete standalone controller without additional I/O modules.
Communication and Expansion Capabilities
You will find two serial ports for programming and networking on this CPU module. For instance, the RS-232 port connects to a PC for program uploads using D300win software. In addition, the RS-485 port handles Modbus RTU communication with up to 31 slave devices. Moreover, this CPU supports I/O expansion for up to 512 digital points. Thus, this processor integrates seamlessly into MICREX-SX automation architectures.
Built-In Real-Time Clock and Task Management
This digital CPU module includes a real-time clock for time-stamped events. Specifically, the clock retains date and time during power loss using battery backup. In addition, the CPU supports cyclic and event-driven task execution. Moreover, a built-in watchdog timer monitors program execution for faults. Therefore, the FUJI NP1AX04-MR meets demanding response time requirements reliably.
Installation and Diagnostic Indicators
Sixteen LED indicators provide operational status at a glance on this module. First, a green Power LED lights when the 5 VDC backplane supply is present. Second, a green Run LED flashes during normal program execution. Third, a red Fault LED indicates hardware or software errors. Fourth, a yellow Battery Low LED warns when the backup battery needs replacement. In addition, eight green LEDs show input status, and four green LEDs show output status. Finally, two yellow LEDs indicate port activity. Thus, you can diagnose system health instantly without external tools.
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