Product Description

The AAI841 (P/N: AAI841-H50/A4S00) is a high-density analog I/O module for the Yokogawa CENTUM VP distributed control system. It maximizes rack utilization by delivering 8 analog input channels and 8 analog output channels within a single I/O slot.

This model is a non-isolated (common-ground) design, making it well suited for systems where field devices are externally isolated or share a stable reference potential. The A4S00 option equips the module with a pressure clamp terminal block, enabling secure, vibration-resistant direct field wiring without the need for KS cable adapters.
With integrated HART communication (H-suffix), the AAI841-H50/A4S00 supports smart device configuration, diagnostics, and digital asset management alongside standard analog control.

Technical Specifications

Application Use Cases

The AAI841-H50/A4S00 is commonly deployed in large-scale industrial plants such as refineries, water treatment facilities, and utility systems, where high I/O density, space efficiency, and HART-enabled device management are required.
It is particularly effective for grouped control loops—such as flow or temperature control valves—where centralized wiring and smart diagnostics simplify maintenance.

FAQ

What is the advantage of the A4S00 option compared to K4A00?
The A4S00 option provides pressure clamp terminals for direct wiring, ideal for custom field cabling. The K4A00 option uses a KS cable interface for fast, standardized plug-and-play installation.

Does the non-isolated design affect signal quality?
In systems with significant ground potential differences, isolated modules are recommended. However, in well-grounded systems or with pre-isolated transmitters, the AAI841 offers a cost-effective and space-efficient solution without compromising performance.