Product Description

The AAP849-S50 is a high-performance integrated I/O module designed for the Yokogawa Electric Corporation CENTUM VP distributed control system (DCS).

This module combines pulse signal acquisition and analog output control within a single hardware unit, optimizing panel space and simplifying field wiring in Remote I/O (RIO) nodes.

It is engineered for demanding industrial environments where high-speed pulse monitoring and precise analog control must operate simultaneously. Typical applications include receiving pulse inputs from turbine flow meters or speed sensors while delivering accurate 4–20 mA control signals to valves and actuators.

Technical Specifications

Common Application Scenarios

Flow Custody Transfer
Receives high-frequency pulse signals from turbine flow meters for precise volume calculation and totalization.

Turbine Control Systems
Monitors rotational speed via pulse inputs while providing 4–20 mA control signals to steam or gas control valves.

Blending & Dosing Systems
Correlates pulse-based flow measurements with analog valve positioning for accurate proportioning.

By integrating pulse and analog output functions, the AAP849-S50 reduces module count and improves cabinet density in FIO-based architectures.

Technical FAQ

Does the AAP849-S50 support redundant configurations?
Yes. When installed in a duplexed FIO node, the module supports dual-redundant communication to maintain continuous operation in case of a bus failure.

Can this module power 2-wire field transmitters?
Yes. The pulse input channels can supply transmitter power (typically 24 V DC), depending on wiring configuration and external load requirements.