Yokogawa ATA4S Modules – ATA4S-00 S2

Technical Dossier

Product Details And Specifications

Yokogawa ATA4S Series Technical Notes

The Yokogawa ATA4S series is a family of analog terminal adapter modules deployed across heavy industrial installations worldwide, including petrochemical complexes, nuclear power facilities, oil refineries, and large-scale chemical processing plants. These modules function as the field-side signal conditioning and termination interface within Yokogawa's CENTUM Distributed Control System (DCS) architecture. Their primary function is to receive 4–20 mA analog signals from field instruments—transmitters, positioners, and sensors—and route them to the I/O bus for processing by the CENTUM controller. The ATA4S-00 S2 specifically operates on the S2 bus standard, making it a direct-fit replacement and maintenance component for CENTUM CS 3000 and CENTUM VP installations running the S2 I/O bus topology. Given the decades-long operational lifespan of DCS infrastructure in these industries, the ATA4S series remains in active demand for both corrective maintenance and lifecycle extension programs.

The Evolution of ATA4S Architecture

The ATA4S lineage traces to Yokogawa's CENTUM CS platform, introduced in the early 1990s as one of the first fully digital DCS architectures with redundant I/O bus capability. The original CENTUM CS used a proprietary ESB (Enhanced Serial Bus) for I/O communication. As the platform evolved into CENTUM CS 1000 and subsequently CENTUM CS 3000 (released 1998), Yokogawa introduced S1 and S2 bus variants to support higher-density I/O configurations and improved noise immunity in harsh plant environments.

ATA4S Full Catalog & Functionalities (SKU List)

Analog Input Terminal Adapters — Single-Ended (S2 Bus)

• ATA4S-00 S2: 4-ch analog input terminal adapter, S2 bus, standard density, non-isolated
• ATA4S-00 S1: 4-ch analog input terminal adapter, S1 bus, CENTUM CS 1000 compatible
• ATA4S-02 S2: 4-ch analog input terminal adapter, S2 bus, HART communication pass-through enabled
• ATA4S-10 S2: 4-ch analog input terminal adapter, S2 bus, high-density I/O configuration
• ATA4S-S1: Single-channel analog input terminal adapter, S1 bus, point-to-point field wiring
• ATA4S-S2: Single-channel analog input terminal adapter, S2 bus, point-to-point field wiring

Analog Input Terminal Adapters — Differential (S2 Bus)

• ATA4D-00 S2: 4-ch differential analog input terminal adapter, S2 bus, enhanced noise rejection
• ATA4D-00 S1: 4-ch differential analog input terminal adapter, S1 bus, CS 1000 compatible
• ATA4D-02 S2: 4-ch differential analog input terminal adapter, S2 bus, HART-enabled
• ATA4D-10 S2: 4-ch differential analog input terminal adapter, S2 bus, high-density configuration
• ATA4D-S1: Single-channel differential analog input terminal adapter, S1 bus
• ATA4D-S2: Single-channel differential analog input terminal adapter, S2 bus

Digital Terminal Adapters (S2 Bus)

• ATD5S-00 S2: 8-ch digital input terminal adapter, S2 bus, 24 VDC field voltage
• ATD5D-00 S2: 8-ch digital output terminal adapter, S2 bus, relay contact output
• ATD5S-02 S2: 8-ch digital input terminal adapter, S2 bus, high-speed pulse input capable
• ATD5D-02 S2: 8-ch digital output terminal adapter, S2 bus, transistor sink output
• ATD5S-10 S2: 8-ch digital input terminal adapter, S2 bus, intrinsically safe field wiring
• ATD5D-10 S2: 8-ch digital output terminal adapter, S2 bus, intrinsically safe field wiring

Sourcing Hard-to-Find & Obsolete ATA4S Parts

Yokogawa officially transitioned CENTUM CS 3000 to limited support status, with end-of-life announced for certain hardware sub-assemblies. However, the installed base of CS 3000 and early CENTUM VP systems in refineries and chemical plants means ATA4S-series terminal adapters will remain in active maintenance demand for 10 to 20 additional years beyond the manufacturer's support window.

Quality Control for the ATA4S Range

The ATA4S series modules incorporate a multi-layer PCB backplane with proprietary Yokogawa bus connectors. Standard visual inspection is insufficient to verify functional integrity. DriveKNMS applies a structured test protocol for all ATA4S units prior to shipment:

• Bus connector continuity test: All S1/S2 bus pins verified for contact resistance within Yokogawa-specified tolerances using a calibrated pin tester.
• Analog channel accuracy verification: Each analog input channel stimulated with a precision 4–20 mA source; output compared against rated accuracy specification (typically ±0.1% of span).
• HART pass-through validation (for -02 suffix variants): HART signal superimposition tested at 1200 baud to confirm communication overlay circuit integrity.
• Isolation resistance test: Field-side to bus-side isolation measured at 500 VDC to confirm dielectric integrity.
• Thermal cycling check: Modules subjected to 0–55°C thermal cycle to identify latent solder joint failures common in aged PCB assemblies.

All test results are logged and supplied with each unit as part of the shipment documentation package.