AAI135-S00/K4A00 Yokogawa Analog Input Module

The Yokogawa AAI135-S00/K4A00 is an 8-channel isolated analog input module designed to receive 4-20 mA current signals from field transmitters. It converts these signals into input data for the control system, supporting process measurement and monitoring. The module provides channel isolation, HART communication capability and a 10 ms data update period. This configuration also includes a KS Cable Interface Adapter (ATK4A-00).

Technical Specifications

Analog Input and Signal Processing

The AAI135 accepts 4-20 mA analog signals through eight isolated input channels. Each channel receives a current signal from a field transmitter, allowing the control system to acquire multiple process measurements through one module.

Furthermore, the 10 ms data update period defines the interval at which the module refreshes its input data. Its specified accuracy of +/-16 uA and temperature drift of +/-16 uA per 10 deg C provide important reference values when checking measurement performance.

Electrical Characteristics and Isolation

The module provides 500 V AC withstand voltage for one minute between the input and system, as well as between input channels. This isolation helps limit electrical interference and prevents direct electrical coupling between the specified circuits.

In addition, the input resistance varies with the operating condition. It ranges from 290 ohm at 20 mA to 450 ohm at 4 mA when powered, while the resistance reaches at least 500 kohm when power is off.

HART Communication and Connection Configuration

The AAI135 supports HART communication, allowing digital communication alongside the 4-20 mA analog signal. This capability can support communication with compatible HART field devices, subject to the control system configuration.

The specified /K4A00 option identifies the KS Cable Interface Adapter, model ATK4A-00. Therefore, buyers should check the adapter and external connection arrangement when replacing an existing module or preparing a new installation.

Ordering Configuration

The supplied ordering information identifies the following configuration:

• S: Standard type.
• 00: Basic type configuration.
• K4A00: KS Cable Interface Adapter, model ATK4A-00.

The AAI135 ordering information also identifies other configurations, including HART communication (-H), explosion protection (5 or E), and environmental options (0 or 3). These are ordering alternatives and should not be interpreted as features of the specified S00/K4A00 unit.

Frequently Asked Questions

Q: How many analog signals can the AAI135-S00/K4A00 receive?

A: It supports eight isolated input channels, each designed for a 4-20 mA current signal.

Q: Does the AAI135-S00/K4A00 support HART communication?

A: Yes. HART communication is specified as available for the AAI135. The connected field device and control system configuration must also support the required HART communication functions.

Q: What does the K4A00 suffix indicate?

A: K4A00 identifies the KS Cable Interface Adapter, model ATK4A-00. It specifies the connection accessory configuration rather than a change to the module's eight-channel analog input function.