Yokogawa AAI835-H00 Analog I/O Module

Overview

Configured for 4-20 mA signal acquisition and output in Yokogawa CENTUM VP and CENTUM CS systems, the Yokogawa AAI835-H00 (AAI835 Analog I/O Module) provides four analog input channels and four analog output channels with channel isolation and HART communication support.

Hardware Specifications

Yokogawa HART and Channel Isolation

The AAI835-H00 handles standard 4-20 mA DC analog signals through four input and four output channels. In addition, the HART function supports digital communication over compatible analog instrument loops.

Channel isolation separates the individual signal circuits and reduces electrical interaction between channels. Therefore, the module can process analog field signals while limiting the effects of common electrical interference and ground-loop conditions.

The module supports signal acquisition and analog output functions within Yokogawa CENTUM VP and CENTUM CS control architectures. The available HART capability also permits communication with compatible smart field instruments.

Frequently Asked Questions

Q: How many analog input and output channels does the AAI835-H00 provide?
A: The module provides 4 analog input channels and 4 analog output channels.

Q: What analog signal range does the AAI835-H00 use?
A: The supplied specifications identify 4-20 mA DC for both analog input and analog output.

Q: Does the AAI835-H00 support HART communication?
A: Yes. The H suffix identifies HART digital communication support for the module.

Field Installation Guidelines

• Install the module in the designated Yokogawa system hardware location and follow the applicable system installation documentation.
• Verify module identification and terminal assignments before connecting field wiring.
• Route analog signal wiring separately from high-voltage power and high-current switching conductors where practical.
• Use appropriate shielded instrumentation cable for analog field circuits when required by the installation design.
• Terminate cable shields according to the site grounding design and Yokogawa system wiring requirements.
• Confirm the polarity of each 4-20 mA circuit before energizing the field loop.
• Check that connected field instruments match the supported 4-20 mA signal interface.
• For HART-enabled instruments, verify that the loop wiring and connected devices support the required HART communication path.
• Do not apply field power until all wiring, terminal connections, and channel assignments have been checked.

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