FUJI NP1L-RS5 Communication Module

This communication module handles serial data exchange for FUJI MICREX-SX automation systems. It interfaces the PLC with external devices such as HMIs and host computers. Therefore, it enables reliable data transfer in industrial network environments.

Physical and Communication Specifications

The FUJI NP1L-RS5 measures 13.0 cm in length and 9.5 cm in width. Moreover, its module weight equals approximately 0.30 kg for rack mounting. A single 48-pin male connector links this module to the MICREX-SX backplane. Additionally, the unit includes two independent isolated serial communication ports.

Parameter	Specification
Brand	FUJI Electric
Full Model	NP1L-RS5
Category	Communication Module
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	0.30 kg (0.66 lbs)
Backplane Interface	1 x 48-pin Male Connector (MICREX-SX Rack)
Power Supply Input	5 VDC from Backplane (0.5 A Typical)
Power Consumption	2.5 W (Typical)
Processor Type	8-bit Microcontroller (8 MHz)
Program Memory	16 kB ROM (Firmware)
Data Memory	8 kB RAM (Battery Backed)
Backup Battery	Internal Lithium (3V, 5 Year Life)
Communication Ports	2 x 9-pin D-Sub Male (RS-232C/RS-422 Selectable)
Supported Protocols	Modbus RTU + ASCII + FUJI Proprietary
Baud Rate Range	300 to 115200 baud
Data Bits	7 or 8 Bits (Configurable)
Parity Options	None, Even, Odd
Stop Bits	1 or 2 Bits
RS-422 Cable Length	500 meters (1640 feet) Maximum
RS-232 Cable Length	15 meters (49 feet) Maximum
Isolation Rating	1500 Vrms (Each Port to Logic)
On-Board Components	1 Microcontroller + 2 UARTs + 2 Memory Chips + 2 Line Drivers + 4 Optocouplers + 4 Isolation Transformers + 6 Protection Diodes + 1 Voltage Regulator
Energy Storage	2 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 Retention)
Operating Temperature	0°C to +55°C (32°F to 131°F)
Storage Temperature	-25°C to +85°C (-13°F to 185°F)
Mounting Type	MICREX-SX PLC Rack (Single Slot)
Status Indicators	1 Green LED (Power) + 1 Green LED (Run) + 2 Yellow LEDs (Port Activity) + 1 Red LED (Fault)

Communication Protocols and Connectivity

The FUJI NP1L-RS5 supports multiple industrial communication protocols for flexibility. Specifically, Modbus RTU connects to third-party HMIs, drives, and SCADA systems. In addition, ASCII protocol allows connection to barcode scanners and printers directly. Furthermore, the FUJI proprietary protocol ensures compatibility with legacy equipment. Consequently, this module connects MICREX-SX PLCs to a wide range of external devices.

Dual Isolated Serial Ports

Two independent RS-232C or RS-422 ports provide flexible connectivity with isolation. For instance, you can connect an HMI to port one and a printer to port two. In addition, each port features switch-selectable RS-232 or RS-422 interfaces. Moreover, the 1500 Vrms isolation protects the PLC from ground loops and surges. Furthermore, RS-422 allows cable runs up to 500 meters for remote installations. Thus, this module suits electrically noisy industrial environments perfectly.

Energy Storage and Data Retention

This communication module stores energy using four onboard capacitors for power filtering. Specifically, two electrolytic capacitors smooth the 5 VDC supply for stable processor operation. In addition, two tantalum capacitors provide high-frequency noise suppression for UART circuits. Furthermore, a replaceable lithium battery retains communication parameters and buffer data. Therefore, the FUJI NP1L-RS5 preserves configuration settings for up to five years.

Installation and Diagnostic Indicators

Five 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 firmware execution. Third, two yellow Port Activity LEDs illuminate during data transmission or reception. Finally, a red Fault LED indicates hardware errors or watchdog timeouts. Thus, you can diagnose communication status instantly without external tools.