YOKOGAWA NFAI841-S00

YOKOGAWA NFAI841-S00

Product Overview
The NFAI841-S00 is an analog input/output module for the Yokogawa FCN-100 remote I/O system. It provides eight 4 to 20 mA DC analog inputs and eight 4 to 20 mA DC analog outputs in a non-isolated configuration. The module is used to connect analog process instruments such as transmitters, converters, control valves, and recorders to the FCN-100 control network. This module family is listed as discontinued in vulnerability and asset databases, so it is typically encountered in existing installations, spare parts inventories, or legacy FCN-100 systems.

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Description

YOKOGAWA NFAI841-S00

Technical Specifications

  • Brand: Yokogawa
  • Product Family: FCN-100 Remote I/O
  • Module Type: Analog input/output module
  • Model: NFAI841-S00
  • Analog Inputs: 8 channels, 4 to 20 mA DC
  • Analog Outputs: 8 channels, 4 to 20 mA DC
  • Isolation: Non-isolated
  • Signal Type: DC current loop signals
  • System Compatibility: Yokogawa FCN-100 remote I/O system
  • Product Status: Discontinued in referenced asset listings; verify current availability and support with Yokogawa or an authorized supplier

Functional Features

  • Eight analog inputs: Acquires 4 to 20 mA DC signals from field transmitters.
  • Eight analog outputs: Sends 4 to 20 mA DC command signals to field actuators.
  • Non-isolated design: Shares common reference within the module; wiring and grounding must follow system rules.
  • Remote I/O integration: Connects to the FCN-100 network for centralized monitoring and control.
  • Compact channel density: Provides 16 analog channels in one module slot.
  • Status indication: Module LEDs report power, communication, and fault status depending on system configuration.
  • Diagnostics: Supports module-level and channel-level status monitoring through the FCN-100 system.

Application Scenarios

  • Process variable acquisition in chemical, oil and gas, and power plants
  • Analog signal conversion between field instruments and control systems
  • Valve positioner and actuator command output
  • Temperature, pressure, flow, and level signal integration
  • Remote skid and package unit I/O expansion
  • Legacy FCN-100 system maintenance and migration projects

Performance Parameters

  • Input Range: 4 to 20 mA DC per channel
  • Output Range: 4 to 20 mA DC per channel
  • Channel Count: 8 inputs plus 8 outputs
  • Isolation: Non-isolated
  • Scan/Update Rate: Determined by FCN-100 system configuration and CPU scan settings
  • Accuracy: Defined by the analog module specification; refer to the official Yokogawa manual for exact values
  • Common-Mode Behavior: Non-isolated channels require careful grounding and loop power design

Material Composition

  • PCB Assembly: Industrial printed circuit board with analog input and output conditioning circuits
  • Terminal Interface: Screw or plug-in terminal block for field wiring
  • Connectors: Backplane connector for base unit
  • Indicators: LED status indicators for module health and communication
  • Enclosure: Module housing designed for insertion into an I/O base

Structural Features

  • Plugs directly into an I/O slot.
  • Front-accessible terminals: Allows convenient wiring and maintenance.
  • LED status window: Shows module operating condition.
  • High-density analog layout: Combines inputs and outputs in one module.
  • Non-isolated terminal grouping: Requires attention to loop power and grounding layout.

Working Principle
Field transmitters send 4 to 20 mA DC signals to the NFAI841-S00 analog input channels. The module converts these current signals into digital values for the system. The controller processes the data and may generate output commands. The analog output channels then convert digital control values back into 4 to 20 mA DC signals for field devices. Because the module is non-isolated, all channels share a common electrical reference within the module.

Installation Requirements

  • Install the module only in a compatible Yokogawa I/O base unit.
  • Confirm the CPU, power supply, and communication settings before commissioning.
  • Verify that the 4 to 20 mA loop power source matches the field instrument requirements.
  • Observe non-isolated wiring rules to avoid ground loops and measurement errors.
  • Use shielded instrument cables for analog signal wiring.
  • Label each input and output channel according to the I/O list.
  • Check LED indicators and system diagnostics after power-up.

Precautions for Use

  • Do not apply voltages or currents outside the 4 to 20 mA DC range.
  • Avoid connecting isolated and non-isolated loops without verifying grounding.
  • Do not remove or insert the module while the system is powered unless hot-swap procedures are approved.
  • Verify channel configuration before connecting field devices.
  • Treat this module as a discontinued product in many references; confirm spare availability and replacement options with Yokogawa.
  • For exact accuracy, wiring diagrams, terminal assignments, and environmental ratings, refer to the official Yokogawa NFAI841-S00 manual.

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