Product Description

The AAP135-S00/I3S00 is a high-performance pulse input module developed by Yokogawa for integration into CENTUM VP and CENTUM CS distributed control systems. This 8-channel module is engineered to provide precise signal conditioning and pulse counting for various field pulse sources, including mechanical contact closures, voltage pulses, and current pulse signals. The module provides channel-to-channel and field-to-system galvanic isolation, helping protect control hardware from electrical noise and ground loop interference.

Designed for safety-critical automation environments, the AAP135-S00/I3S00 is SIL 3 certified (IEC 61508), making it suitable for Safety Instrumented Systems (SIS) and emergency shutdown applications. The module also supports dual-redundant configurations, ensuring high system availability and reliable data continuity in mission-critical control loops.

Technical Specifications

Application

• Safety Instrumented Systems (SIS): Provides reliable pulse measurement data for emergency shutdown and safety monitoring systems.

• Flow Measurement: Captures frequency signals from turbine or magnetic flow meters for volumetric flow calculation.

• Speed Monitoring: Tracks tachometer or encoder signals for motor and pump speed control.

• Process Automation: Suitable for petrochemical, oil & gas, and power generation process control environments.

Technical FAQ

How does SIL 3 certification affect installation?
The SIL 3 rating requires strict adherence to Yokogawa safety installation guidelines. Typically, this includes using redundant module configurations and following certified safety loop design practices to maintain the required probability of failure on demand (PFD) levels.

Does this module require special cabling for high-frequency pulse signals?
Yes. For pulse signals approaching 800 Hz, it is recommended to use shielded twisted-pair cabling to reduce electromagnetic interference and maintain signal accuracy and stability.