AAI143-S03/A4S00 Yokogawa Analog Input Module

Hardware Specifications

4-20 mA HART and Channel Isolation

The AAI143-S03/A4S00 processes 4-20 mA DC transmitter signals through 16 individually isolated input channels. The channel isolation separates field input circuits from the system side and limits electrical interaction between input channels.

The module also supports HART communication. Therefore, compatible field devices can use the existing analog current loop for HART-based communication. The transmitter supply supports both 2-wire and 4-wire configurations, with each channel selectable through pins.

The specified 10 ms data update period defines the module’s analog data refresh interval. Input resistance varies with operating current when the module is powered.

Frequently Asked Questions

Q: What input signal does the AAI143-S03/A4S00 accept?
A: Each of its 16 isolated channels accepts a standard 4-20 mA DC input signal, with an allowable input current of 24 mA maximum.

Q: Can the module support both 2-wire and 4-wire transmitters?
A: Yes. Each channel can be configured for a 2-wire or 4-wire transmitter through the specified pin settings.

Q: Does the module support HART communication?
A: Yes. The supplied specifications identify HART communication as supported.

Field Installation Guidelines

• Install the module and its associated terminal connection hardware according to the Yokogawa system configuration and applicable installation documentation.
• Verify the module model and terminal connection type before wiring.
• Confirm the field transmitter wiring configuration before selecting the 2-wire or 4-wire channel setting.
• Keep analog signal wiring separated from high-current power and switching conductors where practical to reduce electrical interference.
• Use appropriate shielded instrumentation cable where the field installation requires signal shielding.
• Terminate cable shields according to the site’s established grounding scheme and Yokogawa installation requirements.
• Check transmitter loop polarity and supply conditions before energizing each channel.
• Confirm that the field loop current remains within the specified 4-20 mA operating range and does not exceed the 24 mA allowable input current.
• Verify the terminal, MIL connector cable, or KS1 dedicated cable arrangement before commissioning.
• Check the isolation and signal status of each channel during loop testing before connecting the module to the process control application.