Fuji Electric NB1 Series Modules NB1-E24X-AC

Technical Dossier

Product Details And Specifications

Fuji Electric NB1 Series Technical Notes

The Fuji Electric NB1 Series is a compact, modular programmable logic controller platform deployed across heavy industrial sectors including petrochemical processing, power generation, water treatment, and discrete manufacturing. The NB1 architecture is characterized by its DIN-rail-mountable form factor, integrated AC/DC power input variants, and a structured I/O expansion bus that supports both digital and analog signal types. In global heavy industry, the NB1 Series occupies the mid-range control tier — positioned above relay-based systems and below full DCS platforms — making it a standard choice for machine-level automation and process sequencing in facilities where compact footprint and deterministic scan times are critical operational requirements.

The NB1-E24X-AC specifically is an AC-powered digital input/output expansion unit within the NB1 family, providing 24-point mixed I/O capacity suitable for interfacing with field devices including sensors, actuators, solenoid valves, and motor starters in 100–240V AC supply environments.

The Evolution of NB1 Series Architecture

The Fuji Electric NB1 Series was introduced as part of Fuji's broader MICREX-SX and compact PLC product strategy, targeting OEM machine builders and system integrators requiring a cost-effective, space-efficient controller with deterministic I/O response. Early NB1 units featured fixed I/O configurations with onboard AC power supply inputs, targeting single-phase industrial environments. Subsequent revisions introduced modular expansion capability, allowing base units to be extended with discrete digital I/O modules, analog input/output modules, and communication adapters.

NB1 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Fuji Electric NB1 Series. Models are classified by functional category.

Base CPU / Controller Units

• NB1-E24X-AC: 24-point digital I/O expansion unit, AC power input, mixed DI/DO configuration
• NB1-E16X-AC: 16-point digital I/O expansion, AC supply, compact DIN-rail mount
• NB1-E16X-DC: 16-point digital I/O expansion, 24V DC supply variant
• NB1-E24X-DC: 24-point digital I/O expansion, 24V DC supply, sink/source configurable

Digital Input (DI) Modules

• NB1-DI16: 16-channel digital input module, 24V DC, sink type
• NB1-DI32: 32-channel digital input module, high-density I/O for large-scale sequencing
• NB1-DI16-AC: 16-channel digital input, 100–240V AC input signal compatible

Digital Output (DO) Modules

• NB1-DO16T: 16-channel transistor output module, 24V DC, NPN open-collector
• NB1-DO16R: 16-channel relay output module, 250V AC / 30V DC contact rating
• NB1-DO32T: 32-channel transistor output, high-density discrete control

Analog Input/Output (AI/AO) Modules

• NB1-AI4: 4-channel analog input module, 4–20mA / 0–10V selectable, 12-bit resolution
• NB1-AI8: 8-channel analog input, suitable for multi-loop process variable monitoring
• NB1-AO4: 4-channel analog output module, 4–20mA current output for control valve positioning

Communication Adapter Modules

• NB1-RS485: RS-485 serial communication adapter, Modbus RTU master/slave support
• NB1-ETH: Ethernet communication module, 10/100 Mbps, Modbus TCP protocol
• NB1-PROFIBUS: PROFIBUS-DP slave adapter for integration into Siemens or ABB DCS environments

Power Supply Units

• NB1-PA: AC power supply module, 100–240V AC input, 24V DC regulated output for I/O bus
• NB1-PD: DC power supply module, 24V DC input, internal bus power regulation

Quality Control for the NB1 Series Range

NB1 Series modules present specific quality verification challenges due to their integrated backplane bus connectors, onboard EEPROM configuration storage, and mixed AC/DC power input circuitry. DriveKNMS applies the following test protocol to all NB1 units processed through its facility: