Product Overview

The Yokogawa AAI143-H50/K4A00 is an analog input module for 4 to 20 mA signals. This module features 16 isolated input channels for field device connectivity. The suffix code H indicates digital communication capability using the HART protocol. Suffix code 5 confirms no explosion protection on this model. Suffix code 0 designates the basic type for standard applications. The K4A00 suffix includes a KS Cable Interface Adapter (Model ATK4A-00) for connecting an AEA4D Terminal Board. Consequently, the AAI143-H50/K4A00 provides complete signal conditioning and HART communication in one package.

Technical Specifications

General Specifications

Input Specifications

Power & Communication Specifications

16 Isolated Input Channels

The AAI143-H50/K4A00 provides 16 isolated input channels for field transmitter connections. Each channel electrically isolates from the system for noise immunity. Withstanding voltage reaches 1500 V AC between input and system for one minute. Consequently, ground loops and common mode voltages do not affect measurement accuracy. For multi-channel applications, this isolation proves absolutely essential.

Input Signal Characteristics

Input signal range spans 4 to 20 mA for standard industrial transmitters. Allowable input current reaches 24 mA maximum for overload protection. Input resistance when power is ON ranges from 270 Ω at 20 mA to 350 Ω at 4 mA. When power is OFF, input resistance measures 500 kΩ or larger. Accuracy reaches ±16 µA for precise process measurement. Data updates occur every 10 ms for fast control loop response. Additionally, drift due to ambient temperature change measures only ±16 µA per 10°C. Therefore, the Yokogawa AAI143-H50/K4A00 maintains accuracy across temperature variations.

Transmitter Power Supply

The AAI143-H50/K4A00 provides power for connected 2-wire transmitters. Supply voltage measures 19.0 V or higher at 20 mA load. Supply voltage measures 25.5 V or less at 0 mA load. Output current limits to 25 mA for transmitter protection. For each channel, you can set either 2-wire or 4-wire transmitter configuration using setting pins. This flexibility allows mixing transmitter types on the same module. Consequently, the Yokogawa AAI143-H50/K4A00 adapts to various field device power requirements.

HART Communication (Suffix H)

Suffix code H enables digital communication using the HART protocol. HART signals superimpose on the 4 to 20 mA analog signal. This capability allows digital configuration and diagnostics of connected HART devices. For example, you can read transmitter status, change range, or monitor variables digitally. The AAI143-H50/K4A00 supports both analog measurement and digital HART communication simultaneously. For smart transmitter integration, this feature proves invaluable.

KS Cable Interface Adapter (K4A00)

The K4A00 suffix includes a KS Cable Interface Adapter (Model ATK4A-00). This adapter connects the AAI143-H50/K4A00 to an AEA4D Terminal Board for field wiring. The KS1 dedicated cable provides reliable signal transmission between module and terminal board. Pressure clamp terminals and MIL connector cables also serve as external communication options. For system integration, the KS adapter simplifies wiring significantly.

Withstanding Voltage & Isolation

Withstanding voltage between input channels and the system reaches 1500 V AC for one minute. This high isolation rating protects the control system from field-side surges and spikes. Channel-to-channel isolation prevents cross-talk between adjacent input signals. For industrial environments with high common mode voltages, the Yokogawa AAI143-H50/K4A00 ensures safe, accurate measurement.

Current Consumption & Power

Maximum current consumption from the 5 V DC supply reaches 230 mA. Maximum current consumption from the 24 V DC supply reaches 540 mA. The module draws power for both internal circuitry and transmitter field power. Total power depends on the number of connected transmitters and their current draw. Always verify system power capacity when populating multiple AAI143-H50/K4A00 modules.

Installation Guidelines

Follow these steps for proper installation of the AAI143-H50/K4A00.

1. Power down the control system completely before inserting the module.

2. Select an available slot in the Yokogawa I/O rack for this module.

3. Insert the AAI143-H50/K4A00 firmly into the rack until fully seated.

4. Secure the module using the retaining screws at top and bottom.

5. Connect the KS Cable Interface Adapter (ATK4A-00) to the module.

6. Connect the AEA4D Terminal Board using the KS1 dedicated cable.

7. Wire field transmitters to the terminal board according to 2-wire or 4-wire configuration.

8. Set the 2-wire/4-wire pins for each channel before powering up.

9. Power up the system and verify HART communication if used.

Note: The AAI143-H50/K4A00 with suffix code 5 provides no explosion protection. For hazardous areas, select an appropriate explosion-protected model instead. Always set the 2-wire or 4-wire pins before applying power to the transmitters.

Packaging List

• One Yokogawa AAI143-H50/K4A00 Analog Input Module

• One KS Cable Interface Adapter (Model ATK4A-00)

• One product documentation manual

• One anti-static protective bag

Common FAQs

1. How many input channels does the AAI143-H50/K4A00 provide?

This module provides 16 isolated input channels for 4 to 20 mA signals. Each channel isolates from the system for noise immunity. Withstanding voltage reaches 1500 V AC between inputs and system. For multi-transmitter applications, the Yokogawa AAI143-H50/K4A00 offers high channel density in a compact form factor.

2. Does the AAI143-H50/K4A00 support HART communication?

Yes, suffix code H enables digital communication using the HART protocol. HART signals superimpose on the 4 to 20 mA analog signal. This capability allows digital configuration and diagnostics of connected HART devices. For smart transmitter integration, the AAI143-H50/K4A00 provides both analog measurement and digital communication simultaneously.

3. What is the accuracy of the AAI143-H50/K4A00?

Accuracy reaches ±16 µA for precise process measurement. Drift due to ambient temperature change measures only ±16 µA per 10°C. Data updates occur every 10 ms for fast control loop response. Therefore, the Yokogawa AAI143-H50/K4A00 maintains high accuracy across temperature variations and provides responsive measurement for control applications.

4. What power does the AAI143-H50/K4A00 provide for transmitters?

Transmitter power supply measures 19.0 V or higher at 20 mA load. At 0 mA load, supply voltage measures 25.5 V or less. Output current limits to 25 mA for protection. For each channel, you can set either 2-wire or 4-wire configuration using setting pins. Consequently, the AAI143-H50/K4A00 adapts to various transmitter power requirements.

5. What is the K4A00 suffix on the AAI143-H50/K4A00?

The K4A00 suffix includes a KS Cable Interface Adapter (Model ATK4A-00). This adapter connects the module to an AEA4D Terminal Board for field wiring. The KS1 dedicated cable provides reliable signal transmission. For system integration, the KS adapter simplifies wiring and ensures proper signal integrity with the Yokogawa AAI143-H50/K4A00.

Why Choose This Input Module?

The Yokogawa AAI143-H50/K4A00 delivers reliable analog input capability for 4 to 20 mA signals. Sixteen isolated channels provide high density while maintaining channel-to-channel isolation. HART communication (suffix H) enables digital access to smart transmitter data. The KS cable interface adapter (K4A00) simplifies wiring to field termination boards. Accuracy of ±16 µA ensures precise measurement for control applications. For Yokogawa control systems requiring analog input with HART, choose the AAI143-H50/K4A00.