AAI135-S00/K4A00 | Yokogawa CENTUM VP Isolated Current Input Module

Product Overview

The Yokogawa AAI135-S00/K4A00 functions as a reliable 16-channel isolated current input interface for the CENTUM VP and CS 3000 integrated production control systems. This module captures standard 4 to 20 mA DC signals from field transmitters, providing the essential data link for process monitoring and automated control loops. By utilizing high-speed signal processing and robust channel-to-system isolation, it maintains precise data flow even in electrically noisy industrial environments.

Part Number Breakdown: AAI135-S00/K4A00

Yokogawa employs a modular suffix system to define the specific electrical and physical attributes of each I/O card:

• AAI135: Base model for Isolated Current Input (4 to 20 mA, 16-channel).

• -S: Standard type performance specification for general process control.

• 0: Standard type with no explosion protection (General Purpose).

• 0: Basic functional specification for standard operating environments.

• /K4A00: Equipped with the KS cable interface adapter, designed for seamless connection to AEA4D terminal boards via specialized system cables.

Technical Specifications

We supply this module in 100% brand new, original factory condition to ensure full compliance with your system's MTBF requirements.

Engineering Advantages

• Optimized Signal Isolation: The AAI135-S00 provides 500 V AC isolation between the field inputs and the internal system bus. This barrier prevents ground loops and protects the expensive FIO (Field network I/O) nodes from field-side electrical surges.

• Simplified System Integration: The /K4A00 KS cable interface eliminates the need for individual terminal-by-terminal wiring at the module level. This plug-and-play approach reduces installation time and minimizes the risk of wiring errors during commissioning.

• High-Density Monitoring: 16 isolated channels in a single slot allow for maximum I/O density within the cabinet. This helps reduce the total number of I/O nodes required, lowering both hardware costs and the physical footprint of the control room.

• Redundancy Support: When installed in a redundant configuration, the module supports seamless failover. If the active module detects an internal hardware failure, the system automatically switches to the standby module without interrupting the 4-20 mA process signal.

FAQs

• Can I use the AAI135-S00/K4A00 for 2-wire transmitter power?

  The AAI135 series typically acts as a signal receiver (sink). If your 2-wire transmitters require loop power directly from the I/O module, you should verify if your field wiring includes an external 24 V DC supply or consider the AAI143 series which provides integrated loop power.

• What is the benefit of the KS cable interface (/K4A00) over a terminal block?

  The KS cable interface allows you to move the termination point to a separate AEA4D terminal board. This simplifies cabinet organization, makes cable management much cleaner, and allows for faster module replacement during maintenance.

• Is this module compatible with older CENTUM CS 3000 software?

  Yes, the AAI135 is a legacy-friendly module that maintains compatibility across multiple generations of Yokogawa DCS software, provided the appropriate I/O definitions are loaded in the system builder.

• Does this module support HART communication?

  The AAI135-S00 is a standard analog input module and does not support HART digital signal pass-through. For HART-compatible applications, the AAI141 or AAI143 series are the recommended alternatives.