Yokogawa AAI143-H50 S1 Analog Input Module

• Brand
  Yokogawa
• Model
  AAI143-H50 S1
• Product Name
  Analog Input Module
• Place of Origin
  Japan
• HS Code
  8537.10.90
• Dimensions
  107.5 × 32.8 × 130 mm
• Weight
  0.3 kg
• Operating Temperature
  −10 °C to +60 °C
• Storage Temperature
  −20 °C to +70 °C
• Power Supply
  4–20 mA DC
• Warranty
  1 year
• Product Status
  new and original

Yokogawa AAI143-H50 S1

Input：

16-channel galvanically-isolated analog current input channels, accepting 4-20 mA DC process signals with an over-range capability up to 24 mA. Each channel provides independent channel-to-channel galvanic isolation to suppress crosstalk and external interference. The module supports HART7 digital signal superposition on analog current loops for bi-directional field device communication. Built-in loop power supply is available to power 2-wire field transmitters directly without external field power units. Module input resistance ranges from 270Ω to 350Ω, complying with HART loop impedance requirements.

Output：

No physical analog output terminals are provided. Process measurement data is transmitted as digital signals via internal FIO backplane bus to CENTUM VP FCS controller. Acts as HART7 communication master, outputting HART digital modulation signals onto field current loops to read device tags, process variables and diagnostic information. Delivers loop supply voltage for 2-wire transmitters: 19.0V DC at 20 mA loop current and 25.5V DC at 0 mA loop current, providing stable field instrument power under normal working conditions.

Yokogawa AAI143-H50 S1 Operation Guide

Installation Steps

Slide the module into an available slot on the FIO rack and push firmly until the locking mechanism clicks into place.

For redundant deployment, mount two AAI143-H50 S1 units in adjacent paired slots.

Fit the compatible rear terminal block (ATK4A-00 / ATAS00 series) onto the rack backplane.

Validate that FCS firmware and CENTUM VP engineering software are compatible with the S1 hardware revision.

Note: Hot-swap is supported under normal operating conditions. Hot-swap operations are prohibited for active SIS safety-related loops.

Wiring Instruction

2-wire Transmitter (Module-powered field device)

Route transmitter positive conductor to channel positive terminal.

Route transmitter negative conductor to channel negative terminal.

Set the corresponding hardware jumper to 2-WIRE position.

4-wire Transmitter (External 24VDC field power supply)

Transmitter output positive → channel positive terminal

Transmitter output negative → channel negative terminal

Set the corresponding hardware jumper to 4-WIRE position.

HART Wiring Requirements

Maintain total loop resistance ≥250Ω for stable HART digital signal superimposition; avoid adding extra low-resistance components within HART loops.

All channels feature independent isolation. Cross-channel common grounding is strictly forbidden.

Shielded cables shall be single-end grounded at DCS cabinet side while the field end remains floating.

LED Status Definition

PWR (Green): Solid = Module 5V system power healthy; Off = No system power supply

RUN (Green): Solid = Normal operation; Blinking = Module initialization in progress

FAIL (Red): Solid = Severe module hardware fault; Blinking = Channel fault, over-range or field short-circuit

HART (Yellow): Blinking = Active HART data exchange; Off = No HART communication activity

System Configuration (CENTUM VP)

Open Engineering Builder and access FCS hardware configuration workspace.

Assign AAI143-H50 S1 to the target slot; activate redundancy function where applicable.

Configure per-channel parameters as listed below:

  1) Transmitter working mode: 2-wire /4-wire must match physical hardware jumper setting

  2) Input range: 4-20mA, define upper and lower engineering scale values

  3) HART function: Enable or disable HART communication

  4) Input filter time and over-range alarm limits

Download compiled configuration to FCS and apply hardware parameters.

Complete download cycle, then inspect module LED indicators for normal status.

Commissioning Procedure

Upon wiring completion, perform insulation check to eliminate short-circuit between field cables and ground.

Power-up the FIO rack and allow 10-30 seconds for module initialization.

Confirm RUN LED stays solid green and FAIL LED remains extinguished.

Inject standard 4mA /12mA /20mA reference current for each channel, cross-verify PV readings on operator workstation.

With HART enabled, retrieve HART tag information, process variable and device diagnostic data through CENTUM VP HART viewer.

Execute redundancy verification: manually extract primary module, confirm secondary module takes over seamlessly with zero signal interruption.

Hot-swap Operation

Confirm the target module is not assigned to safety instrumented loops.

Release front-panel latch, pull module straight outward for removal.

Insert replacement AAI143-H50 S1 of identical model and secure latch.

Hardware will be auto-recognized by system; configuration re-download is not required.

Monitor LED indicators and confirm RUN status and full channel signal recovery.

Trouble Shooting

FAIL LED solid red

  - Indicates module hardware failure; perform hot-swap module replacement.

FAIL LED blinking with loss of channel signal

  - Check for field cable open-circuit or short-circuit; verify transmitter power supply; inspect 2-wire /4-wire jumper mismatch.

PV locked at under-range or over-range status

  - Measure actual current output from field transmitter; double-check engineering scale configuration.

HART communication failure

  - Verify HART function is activated in software; confirm loop resistance ≥250Ω; confirm field instrument supports HART7 specification.

Signal drift or noisy measurement

  - Review cable shield grounding implementation; separate signal cables from high-power motor wiring; validate channel isolation integrity.

Maintenance Precautions

Operating ambient temperature: -20℃ ~ +70℃

Do not disassemble module enclosure; no user-serviceable internal components.

Keep terminal blocks clean and protected against dust and moisture ingress.

Isolate field loop power source before performing any field wiring disconnection.

Only utilize genuine Yokogawa matched terminal blocks.

• 
  AAI143-H50 S1 datasheet PDF
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