YOKOGAWA AAP135-S00 S2 Pulse Input Module for CENTUM VP and CS 3000 DCS

Brand ABB

Model YOKOGAWA AAP135-S00 S2

Product Overview

The YOKOGAWA AAP135-S00 S2 is a high-performance pulse input module engineered for seamless integration into Yokogawa’s CENTUM VP, CENTUM CS 3000, and CENTUM CS 1000 distributed control systems. As a critical I/O component within the CENTUM series architecture, the YOKOGAWA AAP135-S00 S2 receives contact ON/OFF, voltage pulse, and current pulse signals from field instruments, converting them into precise digital data for process monitoring and control applications .

Designed to handle demanding industrial measurement tasks, the AAP135-S00 S2 features eight fully isolated input channels, each capable of processing signals independently while maintaining electrical separation between the field and the control system . This isolation architecture, combined with channel-to-channel separation, ensures that signal interference from one measurement point does not compromise the integrity of adjacent channels, a critical requirement in electrically noisy process environments .

The YOKOGAWA AAP135-S00 S2 supports a versatile range of input signal types, accommodating no-voltage contact closures, voltage pulses, and current pulses generated by turbine flowmeters, magnetic pickups, encoders, and other frequency-generating devices . With a maximum input frequency reaching 10 kHz depending on configuration, the module is equally suited to low-frequency counting tasks and high-speed frequency measurement applications . The YOKOGAWA AAP135-S00 S2 delivers both instantaneous frequency values and 32-bit accumulated totals per channel, enabling comprehensive monitoring of flow rates, rotational speeds, and cumulative production volumes within a single module footprint .

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	AAP135-S00 S2
Manufacturer	Yokogawa Electric Corporation
Product Type	Pulse Input Module
Compatible Systems	CENTUM VP, CENTUM CS 3000, CENTUM CS 1000
Number of Channels	8 isolated pulse inputs
Input Signal Types	Contact closure, voltage pulse, current pulse
Input Voltage Range	0–24 V DC
Maximum Input Frequency	Up to 10 kHz (varies by configuration)
Minimum Pulse Width	50 µs
Counter Resolution	32-bit accumulator per channel
Measurement Modes	Frequency, period, totalized count, rotational speed
Isolation	Channel-to-channel and channel-to-system isolation
Power Supply Requirements	24 V DC (±20%)
Power Consumption	Max 5.0 W
Operating Temperature	-20°C to +60°C
Storage Temperature	-40°C to +85°C
Humidity Range	5% to 95%, non-condensing
Dimensions (W × H × D)	107.5 × 32.8 × 130 mm (approx.)
Weight	Approximately 0.3 kg
Mounting	DIN rail or panel mounting

Main Features and Advantages

The YOKOGAWA AAP135-S00 S2 distinguishes itself through a combination of measurement precision, signal flexibility, and system integration capabilities that address the practical demands of process automation.

Comprehensive Signal Compatibility: The AAP135-S00 S2 accepts a diverse array of pulse signal types, including no-voltage contact closures from relays or transistor contacts, voltage pulses, and current pulses . This flexibility means a single module type can serve flow measurement loops using turbine meters, speed monitoring applications with magnetic pickups, and counting tasks with proximity switches, reducing spare parts inventory and simplifying system design. For mechanical relay contacts prone to chatter noise, the module provides a filter setting (SW2) that can be activated to eliminate false triggering, ensuring stable pulse counting even with electromechanical signal sources .

Robust Isolation Architecture: Each of the eight input channels on the YOKOGAWA AAP135-S00 S2 is electrically isolated, both between channels and between the field wiring and the control system backplane . This isolation prevents ground loops from degrading signal quality and protects the CENTUM system from voltage transients or faults originating in field wiring. In installations where multiple pulse sources operate at different ground potentials or where long cable runs are unavoidable, the isolation provided by the AAP135-S00 S2 maintains measurement integrity and system safety.

Dual-Redundant Capability: The YOKOGAWA AAP135-S00 S2 supports dual-redundant configuration, allowing a pair of modules to operate in a fault-tolerant arrangement for critical measurement loops . In redundancy mode, the maximum input frequency is limited to 600 Hz with a minimum pulse width of 833 µs, accommodating applications where continuous availability outweighs the need for maximum counting speed . This capability makes the suitable for safety-related or high-availability applications where module failure cannot be tolerated.

Seamless CENTUM Integration: Configuration and commissioning of the YOKOGAWA AAP135-S00 S2 are performed through the CENTUM engineering workstation software environment . The module integrates automatically with the system I/O database, enabling straightforward setup without manual parameter entry at the module level. Both local and remote I/O configurations are supported, providing installation flexibility across different control room and field cabinet architectures .