PLCs, Power Supplies & Others

This compact controller handles discrete logic and timing functions for small to medium applications. It integrates 24 I/O points with a powerful 16-bit processor for reliable program execution. Engineers use this unit for conveyor control, packaging machinery, and simple process automation. The design combines ample memory capacity with flexible expansion capabilities. Its space-saving footprint fits directly into control panels or DIN-rail mounting assemblies.

Processor Architecture and Execution Speed

The NB2W24R features a 16-bit microcontroller operating at a 20 MHz clock frequency. This processor executes basic logic instructions in under 1 microsecond per operation. The unit handles typical ladder logic programs with scan times between 2 and 5 milliseconds. Its deterministic scan cycle ensures consistent response for time-critical control tasks. Therefore, users achieve reliable machine sequencing and interlocking functions.

I/O Configuration and Channel Types

This module provides 14 digital input points and 10 digital output points. The inputs accept 24 VDC signals with built-in LED indicators for each channel. The outputs deliver 24 VDC at 0.5 A per point for driving solenoids and indicators. Four of the input channels operate at 10 kHz for high-speed counting applications. These fast inputs capture encoder pulses and high-frequency proximity sensor signals.

Physical Dimensions and Mounting Options

The NB2W24R measures 8.5 cm in width, 9.0 cm in height, and 6.5 cm in depth. It weighs approximately 0.35 kg, which supports straightforward panel installation. A rugged polycarbonate housing provides impact resistance and electrical insulation. The unit mounts directly onto a standard 35 mm DIN rail using the integrated clip. Alternatively, users can attach the module to panels with optional mounting screws.

Communication Ports and Programming Interface

This module includes one RS-232 port for programming and monitoring purposes. It also provides an RS-485 port for networking with other controllers and HMIs. Both ports use standard 8-pin mini-DIN connectors for reliable connections. The programming port operates at 9.6 kbps for rapid program downloads and uploads. Furthermore, the module supports online editing without stopping the running program.

Internal Components and Memory Configuration

The printed circuit board contains one CPU, two SRAM chips, and six optocouplers. A 128 kB flash memory stores the user program and system parameters permanently. The module also includes 32 kB of battery-backed RAM for data retention during power loss. A 0.1 F supercapacitor maintains the real-time clock for approximately 7 days. These memory resources ensure reliable program storage and system parameter preservation.

Power Requirements and Isolation

The NB2W24R draws 200 mA from the 24 VDC supply under full operational load. Optical isolation provides 1500 VAC separation between the input field circuits and the internal logic. The output circuits include flyback diodes for inductive load transient suppression. Reverse polarity protection prevents damage from incorrect wiring connections. These protective measures enhance the module’s reliability in industrial environments.

Status Indication and Diagnostic Features

The front panel features 24 LEDs indicating the real-time status of each I/O point. Additional LEDs display power, run, and error conditions for quick assessment. The module provides fault history logging with time-stamped entries for troubleshooting. It also includes a watchdog timer that resets the processor upon software lockup. Maintenance personnel can diagnose issues rapidly without connecting external tools.

Environmental Specifications and Compliance

The NB2W24R 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 suits material handling, packaging lines, and automated assembly equipment.

Technical Data Sheet – Fuji NB2W24R

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