Yokogawa AAI841-H50/K4A00 CENTUM VP HART 8-In/8-Out Analog I/O Module

Product Description

The AAI841-H50/K4A00 (Part Number AAI841-H50/K4A00) is a high-density, multifunctional analog interface designed for the Yokogawa CENTUM VP distributed control system. This unit uniquely combines eight channels of 4 to 20 mA input and eight channels of 4 to 20 mA output within a single hardware footprint. It is engineered to optimize rack space while providing robust signal processing for various field instruments and actuators.

Equipped with the -H suffix, the AAI841-H50/K4A00 enables bidirectional digital communication via the HART protocol. This capability allows plant engineers to access advanced device diagnostics and perform remote configuration of smart field instruments without interrupting the analog control signal. The integration of the ATK4A-00 interface adapter ensures seamless connectivity using pre-fabricated KS cables, significantly reducing wiring complexity in control cabinets.

Technical Specifications

• Input Channels 8 channels, 4 to 20 mA DC

• Output Channels 8 channels, 4 to 20 mA DC

• Communication Support Integrated HART Protocol (Digital Pass-through)

• Signal Isolation Non-isolated (Common ground for I/O channels)

• Input Impedance 250 Ω during active operation

• Allowable Output Load 600 Ω maximum resistance

• Data Refresh Cycle 40 ms internal update frequency

• External Interface KS Cable Interface Adapter (ATK4A-00) pre-installed

• Explosion Protection Suffix 5 (No explosion protection for safe area use)

• System Current Consumption 320 mA at 5 V DC and 300 mA at 24 V DC

• Operational Temperature -20°C to 70°C for industrial environments

Configuration and Suffix Breakdown

• AAI841 Base model for combined 4-20 mA input/output operations

• -H Digital communication support via HART protocol

• 5 Standard industrial version without explosion protection

• 0 Basic functional hardware type

• K4A00 Assembly featuring the ATK4A-00 interface for KS cable connection

Industrial Applications

• Simultaneous control and monitoring of intelligent control valves and flow transmitters.

• Space-efficient I/O expansion for CENTUM VP systems in offshore or remote enclosures.

• Remote management of smart positioners using HART diagnostic data.

• General process control loops requiring standard 4-20 mA current signals.

Frequently Asked Questions

How does the KS cable interface benefit the installation?

The AAI841-H50/K4A00 includes the ATK4A-00 adapter which allows for high-density plug-and-play wiring. This eliminates the need for individual terminal screw connections, reducing the risk of wiring errors and accelerating site commissioning.

Can this module handle both 2-wire and 4-wire transmitters?

Yes, the input channels are compatible with standard 4 to 20 mA signals. However, as a non-isolated module, careful attention must be paid to the common ground potential to prevent signal interference in complex grounding environments.