Yokogawa AAP135-S00 Pulse Input Module

Overview

The Yokogawa AAP135-S00 is a pulse input module designed for use within Yokogawa's CENTUM CS3000 distributed control system (DCS). It processes pulse signals from field devices like flow meters and counters.

Key Features and Functions

• Purpose: Receives and processes pulse signals from field devices in a Yokogawa DCS.
• Input Types: Supports various pulse signal types, including:
  • Contact ON/OFF (dry contact)
  • Voltage pulse
  • Current pulse

Signal Processing and Isolation

• Isolation: The module provides isolation between:
  • Field inputs and the system
  • Individual channels This design protects against electrical noise and faults in field wiring.

Channels and Frequency Range

• Channels: Typically features 8 isolated input channels.
• Frequency Range: Handles pulse frequencies up to 10 kHz.

Redundancy and Applications

• Redundancy: Supports dual-redundant configurations for greater system reliability.
• Applications: Widely used in industries such as:
  • Oil and gas
  • Chemical processing
  • Power generation
  • Water and wastewater treatment

Detailed Specifications

• Input Signal Types:
  • 2-wire type: Contact ON/OFF, voltage pulse, current pulse (possible to supply transmitter power).
  • 3-wire type: Power-supply-type voltage pulse.
• Input Frequency: From 0 to 10 kHz.

Withstanding Voltage

• Input to system: 500 V AC for 1 minute.
• Between channels: 500 V AC for 1 minute.

Pulse Input Characteristics

• Minimum Input Pulse Width: 40 µs.
• Input Signal Level:
  • Contact input: Open/close levels for relay or transistor contact.
  • Open: 100 kΩ or larger.
  • Close: 200 Ω or less.

Contact Capacity

• 12 V DC: 15 V DC, 15 mA or higher.
• 24 V DC: 30 V DC, 30 mA or higher.

Voltage/Current Pulse Input

• High Level (VH): 3 to 24 V DC.
• Low Level (VL): -1 to 8 V DC.
• Swing Value: 3 V or higher.