CENTUM VP | Yokogawa AAI835-H00 HART Isolated Analog I/O Module

Product Overview

The Yokogawa AAI835-H00 serves as a high-performance, multi-functional interface for the CENTUM VP and CS 3000 control systems. This module combines 4-channel analog input and 4-channel analog output capabilities into a single, fully isolated unit. Equipped with HART digital communication and integrated explosion protection, it allows for the simultaneous transmission of 4-20 mA process variables and advanced device diagnostics from hazardous field areas.

Part Number Breakdown: AAI835-H00

Yokogawa's specific coding defines the advanced communication and safety features of this module:

• AAI835: Base model for Isolated Analog I/O (4-ch input / 4-ch output).

• -H: Digital communication enabled (Supports HART protocol for smart field devices).

• 0: Built-in explosion protection for deployment in regulated hazardous environments.

• 0: Basic type functional specification for standard system integration.

Technical Specifications

We provide this module in 100% brand new, original factory condition to ensure full compliance with plant safety and reliability standards.

Engineering Advantages

• HART Integration: The AAI835-H00 enables seamless access to smart instrument data. Engineers can perform remote calibration, view device status, and capture secondary variables without additional hand-held communicators or bypass wiring.

• Hazardous Area Readiness: The integrated explosion protection allows for direct connection to instruments located in volatile environments. This eliminates the need for some external barriers, reducing cabinet complexity and wiring costs.

• Hybrid Efficiency: By combining inputs and outputs on a single card, this module maximizes rack space. It provides an ideal solution for small-scale loops or skid-mounted equipment where a 16-channel dedicated card would be underutilized.

• Superior Noise Immunity: Individual channel isolation ensures that a fault or ground loop on one instrument does not affect the remaining three channels. This architectural choice significantly increases the "availability" of critical process loops.

FAQs

• Can the AAI835-H00 replace a standard non-HART AAI835 module?

  Yes, this module is backward compatible with standard 4-20 mA signals. However, to utilize the HART diagnostic features, your CENTUM software must have the appropriate PRM (Plant Resource Manager) or HART-ready license active.

• Does this module provide power to 2-wire transmitters?

  Yes, the input channels on the AAI835-H00 typically provide loop power for 2-wire transmitters while simultaneously receiving the 4-20 mA signal and HART data.

• What is the benefit of "Channel-to-Channel" isolation?

  Most standard modules only isolate the group of channels from the system. The AAI835-H00 isolates each channel from the others, meaning a short circuit or high-voltage surge on Channel 1 will not damage or disrupt the signals on Channels 2, 3, or 4.

• Is special wiring required for the HART signal?

  No. The HART digital signal rides on top of the standard 4-20 mA twisted pair. As long as the field device is HART-compatible and the loop resistance is within the 230-600 $\Omega$ range, communication functions automatically.