Yokogawa AAI143-H00/A4S00 Isolated 16-Channel Analog Input Module

Technical Overview

The AAI143-H00/A4S00 is a high-density, isolated analog input module designed for the Yokogawa CENTUM VP distributed control system. This module supports 16 channels of 4 to 20 mA signals, providing robust data acquisition with built-in HART digital communication capabilities. Unlike non-isolated variants, this unit features a 1500 V AC withstanding voltage between the input channels and the system logic, ensuring maximum protection against ground loops and electrical interference in harsh industrial environments.

Engineered for precision, the AAI143-H00/A4S00 offers an ultra-fast data update period of 10 ms. It is highly versatile, allowing engineers to configure each individual channel for either 2-wire or 4-wire transmitter types via physical setting pins, making it a flexible solution for diverse field instrumentation needs.

Detailed Specifications

• Model Number: AAI143-H00/A4S00

• Input Configuration: 16-channel current input (Fully isolated)

• Signal Range: 4 to 20 mA DC (Standard process signals)

• Digital Communication: HART Protocol supported (H-prefix)

• Terminal Interface: Includes A4S00 Pressure Clamp Terminal Block

• Measurement Accuracy: ±16 µA (High-resolution processing)

• Update Cycle: 10 ms (Real-time monitoring)

• Dielectric Strength: 1500 V AC for 1 minute (Input-to-System)

• Transmitter Power: 19.0 V DC (at 20 mA) to 25.5 V DC (at 0 mA)

• Input Impedance (Power ON): 270 Ω (at 20 mA) up to 350 Ω (at 4 mA)

• Input Impedance (Power OFF): ≥ 500 kΩ (High-impedance safety state)

• Temperature Stability: ±16 µA per 10 °C fluctuation

• Power Requirements: 230 mA (5 V DC) and 540 mA (24 V DC)

• Connection Type: Pressure clamp, MIL connector, or KS1 dedicated cable

• Unit Weight: Approximately 0.3 kg (Excluding terminal block)

Channel Configuration and Wiring

The module is designed for granular control over field wiring. Each channel can be independently toggled between 2-wire (loop-powered) and 4-wire (externally powered) modes using internal jumper pins. The A4S00 suffix denotes that this specific package includes the pressure clamp terminal block, allowing for direct field wiring without requiring separate termination boards.

Comparison: Isolated vs. Non-Isolated Modules

Frequently Asked Questions

• What does the 'H' in the part number signify?

  The 'H' indicates that the module supports HART digital communication, allowing for remote diagnostics and configuration of field instruments through the analog loop.

• Is the terminal block included?

  Yes, the A4S00 code confirms this module is shipped with the Pressure Clamp Terminal Block.

• Can I mix 2-wire and 4-wire transmitters on one module?

  Yes. Each of the 16 channels is individually configurable using the onboard setting pins.