Product Short Description
Product Introduction
NFAI841-S00 is Yokogawa industrial analog input acquisition module for FCN autonomous controller platform. It collects analog signals from field transmitters and sensors, converts analog quantity into digital data and transmits to controller via backplane bus. Widely deployed in process industry distributed control and monitoring systems.
Description
Technical Specifications
- Channel quantity: 8 isolated analog input channels
- Supported signal types: 4–20 mA DC, 1–5 V DC
- A/D conversion resolution: 16 bit
- Basic accuracy: ±0.1% of full span
- Channel isolation: 250 VAC isolation between each channel and system circuit
- Module power supply: 24 VDC ±10%
- Power consumption: Max 2.5 W
- Data update cycle: 10 ms
- Operating temperature range: -10°C ~ +60°C
- Storage temperature: -20°C ~ +70°C
- Humidity condition: 10%–90% RH, non-condensing
- Dimensions: 32.8 mm × 107.5 mm × 130 mm
- Weight: 300 g
Function Features
- 8 independent isolation channels, preventing cross-channel signal interference
- Built-in digital filter, configurable filter time constant to suppress field signal noise
- Supports open-circuit detection for 4–20mA transmitter loop
- Real-time over-range signal diagnosis and fault flag upload
- Hot-swappable design, module replacement without system shutdown
- Parameter configuration via controller engineering software
- Surge protection circuit for field wiring induced transient voltage
Application Scenarios
Petrochemical process monitoring, thermal power plant auxiliary control, water treatment plant automation, oil & gas surface production system, chemical plant DCS signal acquisition, building energy monitoring system. Collect temperature, pressure, flow, liquid level analog signals from transmitters.
Material Composition
Flame retardant plastic module housing; FR-4 multi-layer signal PCB; isolated signal transformer; precision reference voltage chip; surge protection semiconductor components; gold-plated backplane connector; spring-type field signal terminal base.
Structural Characteristics
Standard DIN rail mount module structure; pluggable front terminal block for field wiring; rear edge connector connected to controller backplane bus; internal partition separates analog signal circuit and digital communication circuit; integrated ventilation slits for heat dissipation.
Working Principle
Analog current or voltage signal from field sensor enters each isolated channel. After signal conditioning and isolation, analog signal is converted to digital value by high precision A/D converter. Digital data is buffered and transmitted to FCN controller through backplane bus. The module continuously monitors signal amplitude, judges over-range and open-circuit faults, and uploads fault information to upper control system.
Installation Requirements
Mount on standard DIN rail inside control cabinet; install away from frequency converters and high-current cables; field signal wiring adopts shielded twisted pair; shield single-end grounding at cabinet side; reserve sufficient space for module plug and terminal wiring operation.
Usage Notes
Do not apply voltage signal exceeding rated input range to channels; avoid wiring under thunderstorm environment; regularly check terminal screw tightness; prevent dust and condensation accumulation inside module housing; configure corresponding signal range parameters in software according to on-site transmitter type.
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