Description

Yokogawa NFAI143-S50 Analog Input Module

The Yokogawa NFAI143-S50, also cataloged as the NFAI143 Analog Input Module, operates as a dedicated hardware component for processing 4-20 mA field signals within STARDOM FCN/FCJ controller platforms. It converts and isolates multiple analog loops to ensure precise data acquisition and uninterrupted electrical signal integrity.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa NFAI143-S50
Origin	Japan
Weight	0.3 kg
Dimensions	32 mm × 130 mm × 107 mm
OperatingTemp	-20 degC to +70 degC
PowerConsumption	230 mA (5 V DC), 540 mA (24 V DC)
InputChannels	16 isolated channels
InputSignalRange	4-20 mA DC
AllowableInputCurrent	24 mA max
Accuracy	±0.1% of full scale
Resolution	16 bits
DataRefreshCycle	10 ms
InputStepResponse	100 ms
TerminalConnection	Pressure Clamp or MIL Connector

Process Control Features

The NFAI143-S50 integrates channel-to-channel isolation, eliminating ground loops and minimizing cross-talk. Automatic cold junction compensation (CJC) is implemented to maintain temperature-independent signal accuracy. Each channel supports HART protocol pass-through, allowing diagnostics and calibration of smart transmitters without interrupting the analog loop. The module also provides 24 V DC loop power for 2-wire or 4-wire field instruments.

Frequently Asked Questions

Q: VnA: Can the NFAI143-S50 be hot-swapped during operation?
A: Yes, it supports hot-swap replacement without affecting other modules on the STARDOM backplane.

Q: VnA: What is the channel isolation voltage rating?
A: Each input channel is isolated from the backplane and other channels up to 1500 V AC for 1 minute.

Q: VnA: Can this module supply loop power to transmitters?
A: Yes, each channel can provide 24 V DC with a current limit of 25 mA.

Field Installation Guidelines

• Mount the module on a standard DIN rail with firm mechanical support.
• Ensure all field wiring shields are properly grounded at a single point to avoid noise coupling.
• Maintain separation between high-current and analog signal wires to prevent interference.
• Confirm loop power polarity before energizing the module.
• Route analog signal wires away from switching devices and heavy-duty motors to prevent induced voltage spikes.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems