Yokogawa NFAI143-H50/A4AS0 Analog Input Module

The Yokogawa NFAI143-H50/A4AS0 Analog Input Module is an isolated 16-channel, 4 to 20 mA input module designed for use in various industrial control and monitoring systems. This module is specifically engineered to work in environments requiring precise analog signal acquisition with high levels of isolation and protection.

Key Features:

I/O Module Configuration:

• Model: NFAI143
• Name: Analog Input Module (4 to 20 mA, 16-Channel, Isolated)
• Input Channels: 16 channels of isolated current input
• Terminal Block: NFTA4S (Pressure clamp terminal block for field device connection)
• MIL Connector: MIL 40 pins connector for direct I/O module connection with customer-supplied MIL cable.

Signal and Input Configuration:

• Signal Name:
  • INB: 2-wire transmitter input (by setting pin)
  • I/O Signal: Current input (by setting pin for 4-wire input)
• Input Signal: 4 to 20 mA (Current)
• Allowable Input Current: 24 mA
• Input Resistance:
  • Power ON: 250 Ω
  • Power OFF: 500 kΩ or more

Accuracy and Response:

• Accuracy: ±0.1% of full scale
• Data Refresh Cycle: 10 ms
• Input Step Response Time: 100 ms
• Temperature Drift: Max. ±0.01%/°C

Transmitter Power Supply:

• Power Supply for Transmitters: 24.0 to 25.5 V (with output current limit: 25 mA)
• 2-Wire/4-Wire Transmitter Setting: Adjustable for each channel via a setting pin.

Protection and Safety:

• Overcurrent Protection: Built-in protection against overcurrent situations
• Withstanding Voltage:
  • Between input and system: 1500 V AC for 1 minute.
  • If using KMS40 MIL connector cable: 500 V AC for 1 minute.
• Zener Barrier: Not allowed; use an isolation barrier for intrinsically safe applications.

Power Consumption:

• Maximum Current Consumption:
  • 230 mA (5 V DC)
  • 540 mA (24 V DC)

External Connection:

• Pressure Clamp Terminal: For easy wiring to field devices.
• MIL Connector Cable: Direct I/O module connection with MIL 40 pin connector.

Additional Features:

• HART Communication: Supported (for additional communication functionality)
• Weight: 0.3 kg

Ordering Information and Options:

Model Configuration:

• Model Name: NFAI143
• Suffix Codes:
  • -H: With HART Communication.
  • 5: No explosion protection.
  • 0: Basic type.

Option Codes:

• /A4S00: With Pressure Clamp Terminal Block for analog input (Model: NFTA4S-00).

Installation Notes:

• Power Supply Requirement: When using the NFAI143 I/O module, a 24 V DC power supply is needed to support the analog field power supply terminal of the power supply module.
• HART Function Specifications: For details on HART communication features, please refer to the document GS 34P02Q53-01E.

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