YOKOGAWA ATK4A-00 S1 Terminal block adapter

The Yokogawa ATK4A-00 S1 is a specialized KS Cable Interface Adapter (also known as a Terminal Block Adapter) 

designed for the CENTUM VP and CENTUM CS 3000 Distributed Control Systems (DCS).

 It serves as the physical bridge between field I/O modules and the terminal boards via standard KS cables.

1. Introduction

The ATK4A-00 S1 is an accessory module that mounts directly onto the front of Yokogawa FIO (Field network I/O) modules. 

Its primary purpose is to convert the high-density connector of the I/O module into a 40-pin MIL connector interface.

 This allows for a "plug-and-play" connection using a KS1 or KS2 cable, leading to a remote terminal board (like the AEA4D or A1BA4D), which simplifies cabinet wiring and maintenance.

2. Technical Parameter Table

Simplified Wiring: Replaces tedious point-to-point terminal wiring with a single multi-core KS cable connection, significantly reducing installation time.

Redundancy Support: Can be used in dual-redundant I/O configurations when paired with the appropriate backplane and terminal boards.

Maintenance Friendly: Allows for the replacement of I/O modules without disconnecting individual field wires; simply unplug the KS cable.

Harsh Environment Ready: The S1 designation confirms it is treated with a conformal coating, making it resistant to corrosive gases ($H_2S$, $SO_2$) found in industrial sites.

Space Saving: Its slim profile ensures it does not interfere with adjacent modules in a densely packed I/O node.

4. Application Cases

Petrochemical & Refining: Used in control cabinets where high-density analog signals (pressure, temperature, flow) are routed from field junction boxes to the DCS.

DCS Modernization: Frequently used when upgrading legacy Yokogawa systems to CENTUM VP, allowing for organized cable management.

Offshore Platforms: Ideal for compact cabinets where quick-disconnect capabilities and G3-level environmental protection are required.

Power Plants: Connecting signal conditioners and transmitters to the main Field Control Station (FCS).

5. Related Models & Same Series

The ATK4A is part of the FIO signal connection ecosystem.

Other Models in the Same Series

ATA4S / ATA4D: Pressure clamp terminal blocks for single/dual-redundant analog signals (direct terminal connection).

ATB5S / ATB5D: Pressure clamp terminal blocks for digital signals.

ATD5A: A KS cable interface adapter specifically for Digital I/O modules (32-channel).

ATM4A: A specialized adapter for pulse input or specific voltage modules.

Compatible I/O Modules

AAI141 / AAI143: 16-channel Analog Input Modules.

AAI543: 16-channel Analog Output Module.

AAI135: 8-channel Isolated Analog Input Module.

AAB841: Analog I/O Module (8-in/8-out).