Product Description

The AAI841 is a multi-functional analog I/O module developed for the Yokogawa CENTUM VP and CS 3000 control systems. It maximizes rack efficiency by combining analog input and output functions within a single slot, providing eight total channels typically configured as 4 analog inputs and 4 analog outputs, all operating on 4–20 mA signals.

Designed for high reliability and stable signal processing, the AAI841 features electrical isolation between I/O signals and system logic, protecting the DCS backplane from surges, noise, and ground loop interference. Its compact, robust design makes it well suited for continuous operation in space-constrained industrial environments.

Technical Specifications

Application

The AAI841 is ideal for localized control loops where both measurement and actuation are required in a compact form, such as:

• Heat exchanger and temperature control loops

• Chemical dosing and blending skids

• Remote or skid-mounted instrument enclosures

By handling both feedback and control action on a single module, it reduces wiring complexity and overall I/O footprint.

Frequently Asked Questions

Can the AAI841 be used in redundant configurations?
Yes. When installed on a redundancy-capable CENTUM VP baseplate, the AAI841 supports dual-redundant operation to enhance system availability.

Does the AAI841 support HART communication?
The standard AAI841 is analog-only. For applications requiring HART diagnostics and digital device management, the AAI841-H variant should be selected.