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

Feature	Specification
Model Code	ATK4A-00 S1
Type	KS Cable Interface Adapter (Terminal Block)
Number of Channels	16-Channel (Supports 8-Channel in certain configs)
Interface Port	40-Pin MIL Connector
Signal Compatibility	Analog Input/Output (4-20 mA, 1-5 V)
Compatible Cables	KS1, KS2 Cable
Insulation Resistance	10 MΩ or greater (at 500 V DC)
Withstanding Voltage	500 V AC for 1 minute (between channels)
Weight	Approx. 0.06 kg to 0.1 kg
Environmental Protection	S1 Suffix: Conforms to ISA Standard G3 (Conformal Coating)
Operating Temperature	-20°C to +70°C

3. Product Advantages and Features

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.

ATK4A-00 S1

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).

BENDER	RCMA475LY
Bender	RCMA475-23
BENNING	9061486921
BENTLEY	3500/20
Bentley	3500/61
BENTLEY	9200-06-02-10-00
BENTLY	3300/16-14-01-03-00-00-01
BENTLY	3500/20
BENTLY	125840-02
BENTLY	1X35668
BENTLY	330130-045-00-00
BENTLY	330980-51-00
BENTLY	22810-01-05-50-02
BENTLY	10244-27-50-01
BENTLY	330103-00-04-10-02-00
BENTLY	135462-01
BENTLY	132419-01

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).

ATK4A-00 S1