Product Description

The AAI841 (P/N: AAI841-H50/K4A00) is a high-density analog I/O module designed for the Yokogawa CENTUM VP control system. It provides 8 analog input channels and 8 analog output channels within a single slot, making it ideal for applications requiring a large number of signal exchanges in a compact footprint.

Unlike the AAI835 series, the AAI841 is a non-isolated (common-ground) design, offering a cost-effective solution for installations where field signals share a stable reference or where external isolation is already provided.
With the H-suffix, the module supports HART digital communication, enabling access to diagnostics and multivariable data from smart transmitters and valve positioners. The K4A00 option includes the ATK4A-00 KS cable interface adapter, simplifying cabinet wiring and reducing installation time.

Technical Specifications

Application Use Cases

The AAI841-H50/K4A00 is well suited for high-density control environments such as water treatment facilities, utility systems, and auxiliary process units, where large I/O counts are required and grounding conditions are well controlled.
It is especially effective when paired with pre-isolated field devices or in installations with minimal electrical noise and stable reference potentials.

FAQ

What is the main difference between the AAI841 and AAI835?
The AAI841 provides higher channel density (8-in/8-out) but is non-isolated, while the AAI835 offers lower density (4-in/4-out) with channel-to-channel isolation. Choose AAI841 for dense, cost-sensitive systems and AAI835 where isolation is critical.

Does this module support both HART 5 and HART 7 devices?
Yes. Yokogawa HART-enabled modules are backward compatible, allowing communication with multiple HART versions and access to PV, SV, TV, and QV variables.