Product Core Brief

• Model: -H00
• Brand: YOKOGAWA
• Series: FCN-RTU Analog I/O Module
• Core Function: 16-channel 4–20 mA DC analog input module with HART communication for Yokogawa FCN-RTU systems.
• Product Type: Analog Input Module
• Key Specs: 16 × 4–20 mA DC inputs | HART communication | Field-to-circuit isolated | FCN-RTU compatible
• Condition: New Original / New Surplus
• Status: Discontinued by Yokogawa

Key Technical Specifications

• Product type: Analog input module for Yokogawa FCN-RTU
• Model code:
• Input channels: 16 channels
• Input signal: 4–20 mA DC
• Communication: HART protocol supported
• Isolation: Field-to-circuit isolated; point-to-point non-isolated between channels
• System compatibility: Yokogawa FCN-RTU controller family
• Typical applications: Process signal acquisition for pressure, flow, level, temperature transmitters, and other 4–20 mA field instruments
• Handling: ESD-sensitive I/O module; protect connectors and terminal block

Note: The NFAI143 family is documented as a 16-channel 4–20 mA DC analog input module for FCN-RTU, with the “-H” suffix indicating HART communication and “00” indicating the basic type without additional explosion-protection or environmental suffixes. Exact electrical ratings, update rate, and accuracy should be confirmed against the official Yokogawa FCN-RTU hardware manual or the module nameplate.

 

Product Introduction

The NFAI143-H00 is a Yokogawa FCN-RTU analog input module designed for 16-channel 4–20 mA DC signal acquisition with HART communication. It is typically used in process control systems where field transmitters send standard current-loop signals to the controller, and where HART device variables, diagnostics, or configuration access are required.

For maintenance teams, this module is valuable when replacing a failed analog input card in an existing FCN-RTU station. Because the “-H” suffix enables HART communication, it should only be substituted with the same suffix code when the system relies on HART device integration.

 

QA & Inspection SOP

Each module is inspected before release:

1. Nameplate verification: Confirm the model reads NFAI143-H00.
2. Visual inspection: Check the housing, connector, terminal block, and mounting clips for damage.
3. Connector check: Inspect the system-side and field-side connectors for bent pins or corrosion.
4. Power-on check: Install in a compatible FCN-RTU node and verify normal module detection.
5. Channel check: Apply a known 4–20 mA signal to sample channels and verify reading stability.
6. HART check: If required, verify HART communication with a compatible transmitter.
7. Isolation check: Confirm no obvious short circuits between field terminals and module ground.
8. Packaging: Protect connectors and terminals with anti-static packaging.

Full calibration and channel-by-channel validation require a certified current source and a compatible FCN-RTU controller.

 

Installation Pitfalls & Guide

❗ is not the same as AAI143 or SAI143. NFAI143 belongs to the FCN-RTU family, while AAI143/SAI143 are used in CENTUM CS 3000 / CENTUM VP systems. Do not interchange them without confirming the controller platform.

❗ Match the suffix code. The “-H” indicates HART communication. Replacing an NFAI143-H00 with an NFAI143-Sxx module may remove HART functionality.

❗ Confirm wiring type. The NFAI143 family is documented as point-to-point non-isolated with field-to-circuit isolation. Verify terminal assignments before connecting field loops.

❗ Check loop power. Confirm whether the 4–20 mA transmitters are loop-powered externally or require module-supplied power.

Installation steps:

1. Pre-install: Record the original module model, suffix code, slot position, and channel configuration.
2. Removal: De-energize the I/O node if required, disconnect field wiring, and remove the module.
3. Install: Seat the NFAI143-H00 firmly in the correct FCN-RTU slot and reconnect field wiring.
4. Configuration: Assign channel tags, ranges, and HART settings in the controller configuration.
5. Verification: Restore power, check module status LEDs, and confirm channel readings and HART communication.

Technical FAQ

oes mean?
NFAI143 is a 16-channel 4–20 mA analog input module for FCN-RTU. “-H” indicates HART communication, and “00” indicates the basic type without additional explosion-protection or environmental suffixes.

Can replace AAI143-H00?
Not directly. NFAI143 is an FCN-RTU module, while AAI143 is used in CENTUM CS 3000 / CENTUM VP systems. The controller platform must match.

Is this module still available new from Yokogawa?
The NFAI143 family is listed as discontinued in some technical references. Surplus and refurbished units are available through industrial spare channels.

What should I check if a channel reads incorrectly after replacement?
Verify the loop wiring, loop power, terminal assignment, channel configuration, HART settings, and whether the transmitter is functioning correctly.

Can I use it without HART?
Yes, it can typically be used for standard 4–20 mA input, but the HART capability remains available. If HART is not required, an NFAI143-Sxx variant may also be suitable, subject to system configuration.