Product Overview

The Yokogawa AAP135-S50 S2 is a specialized 8-channel Pulse Input Module designed for the CENTUM VP Distributed Control System (DCS). Unlike standard power modules, the AAP135 serves as a high-speed interface for acquiring frequency and pulse signals from field instrumentation such as flowmeters (turbine, vortex, or electromagnetic), displacement sensors, and speed tachometers. It converts these incoming pulses into engineering units (e.g., flow rate or totalized volume) for real-time process monitoring and control logic execution.

Operating within the FIO (Field Interface Orbus) ecosystem, the AAP135-S50 S2 supports a variety of pulse signal types, including dry contacts, voltage pulses, and current pulses. The module is engineered for high-precision totalization and frequency measurement, featuring robust galvanic isolation to ensure that field-side electrical noise does not interfere with the internal DCS bus.

Technical Specifications

• Manufacturer: Yokogawa

• Model Number: AAP135-S50 S2

• Module Type: Pulse Input Module

• Number of Channels: 8-channel, isolated

• Input Signal Types: Contact (Dry), Voltage Pulse, Current Pulse

• Input Frequency Range: 0.1 Hz to 10 kHz (Sensor dependent)

• Accuracy: ±0.1% of frequency span; Precise totalization logic

• Isolation: 1500 V AC between field and system logic

• Environmental Rating: -20°C to +70°C Operating Temperature

• Redundancy: Supports dual-redundant configuration

• Weight: 0.30 kg

• Dimensions: 32.8 mm x 106.3 mm x 130 mm

• Origin: Japan

Key Technical Characteristics

• High-Speed Signal Processing: Capable of handling pulse frequencies up to 10 kHz, making it suitable for high-velocity turbine flowmeters and high-resolution rotational speed monitoring.

• Comprehensive Signal Protection: Features integrated surge, overload, and short-circuit protection for each channel, ensuring hardware longevity in volatile industrial electrical environments.

• Dual-Redundant Support: Designed for mission-critical applications where data continuity is essential. When used in a redundant pair, the system ensures seamless pulse counting even during a single module failure.

• Advanced Totalization: Built-in logic allows for accurate integration of pulses over time, supporting both instantaneous rate calculation and cumulative totalization for billing or inventory management.

• Robust Build Quality: Optimized for extreme temperatures and mechanical vibration, meeting the technical requirements for heavy industries like oil & gas, power generation, and chemical processing.

• Seamless System Integration: Automatically recognized within the CENTUM VP engineering environment, allowing for rapid scaling and configuration of engineering units through standard I/O builders.