Yokogawa ATI3S Series Terminal Blocks ATI3S-00 S2

Technical Dossier

Product Details And Specifications

Yokogawa ATI3S Series: Comprehensive Terminal Block Range and Technical Overview

The Yokogawa ATI3S Series terminal blocks are field-side wiring interface components designed for use within the Yokogawa CENTUM VP and legacy CENTUM CS 3000 Distributed Control Systems (DCS). These units serve as the physical termination point between field instrument cables and the I/O module backplane, providing a structured, maintainable wiring interface in high-density process control environments.

ATI3S terminal blocks are deployed across global heavy industry sectors including petroleum refining, petrochemical complexes, LNG terminals, nuclear power generation auxiliary systems, pulp and paper mills, and large-scale water treatment facilities. Their standardized form factor and DIN-rail mounting compatibility make them a long-term infrastructure component in plants with 20+ year operational lifecycles.

The Evolution of ATI3S Architecture

The ATI3S terminal block series was introduced as part of Yokogawa's modular field wiring strategy for the CENTUM CS 3000 platform, which entered service in the late 1990s. The design philosophy centered on separating field wiring from I/O module replacement — allowing technicians to swap I/O cards without disturbing field cable terminations, a critical requirement in live process environments.

With the transition to CENTUM VP (released 2008), Yokogawa maintained backward compatibility with the ATI3S mechanical form factor, ensuring that existing field wiring infrastructure could be retained during DCS migration projects. This architectural continuity significantly reduced the cost and risk of platform upgrades at brownfield sites.

The ATI3S series uses a screw-terminal or spring-clamp termination mechanism (variant-dependent), supports standard 0.5–2.5 mm² field wiring, and interfaces with the corresponding I/O module via a dedicated connector block. Signal types supported span analog input (4–20 mA, thermocouple, RTD), analog output, discrete input, and discrete output, depending on the paired I/O module type.

As CENTUM CS 3000 has entered its end-of-active-support phase, the ATI3S series is now primarily sourced as a spare part for maintenance and life extension programs rather than new installations. CENTUM VP continues to support ATI3S-compatible terminal blocks in its current hardware catalog.

ATI3S Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified ATI3S series terminal block range for Yokogawa CENTUM VP and CS 3000 DCS platforms. Units are categorized by signal type and wiring configuration:

Analog Input Terminal Blocks

• ATI3S-00 S2: Standard analog input terminal block, 16-channel, screw termination, for AI module pairing
• ATI3S-01 S2: Analog input terminal block with built-in fuse protection per channel
• ATI3S-02 S2: Analog input terminal block, spring-clamp termination variant
• ATI3S-03 S2: Analog input terminal block with loop power distribution rail
• ATI3S-04 S2: Analog input terminal block, intrinsically safe (IS) field wiring compatible

Analog Output Terminal Blocks

• ATI3S-10 S2: Standard analog output terminal block, 8-channel, screw termination
• ATI3S-11 S2: Analog output terminal block with individual channel isolation
• ATI3S-12 S2: Analog output terminal block, spring-clamp termination variant

Discrete Input Terminal Blocks

• ATI3S-20 S2: Discrete input terminal block, 32-channel, dry contact, screw termination
• ATI3S-21 S2: Discrete input terminal block, 24 VDC wet contact configuration
• ATI3S-22 S2: Discrete input terminal block, 32-channel, spring-clamp termination
• ATI3S-23 S2: Discrete input terminal block with surge protection per channel

Discrete Output Terminal Blocks

• ATI3S-30 S2: Discrete output terminal block, 16-channel, relay output, screw termination
• ATI3S-31 S2: Discrete output terminal block, transistor output, 24 VDC
• ATI3S-32 S2: Discrete output terminal block, spring-clamp termination, relay output

Thermocouple / RTD Terminal Blocks

• ATI3S-40 S2: Thermocouple input terminal block, 16-channel, cold junction compensation integrated
• ATI3S-41 S2: RTD input terminal block, 8-channel, 3-wire PT100 configuration

Sourcing Hard-to-Find & Obsolete ATI3S Parts

DriveKNMS maintains a dedicated inventory of tested ATI3S terminal blocks sourced through verified industrial surplus channels, decommissioned plant equipment, and authorized secondary market suppliers. All units are inspected prior to listing. For discontinued or low-availability SKUs, DriveKNMS provides cross-reference support to identify compatible replacement terminal blocks within the current Yokogawa CENTUM VP catalog or equivalent third-party alternatives.

Quality Control for the ATI3S Range

Each ATI3S terminal block processed by DriveKNMS undergoes a structured inspection and functional verification protocol prior to dispatch:

• Visual Inspection: Housing integrity check, terminal screw/spring-clamp condition, connector pin alignment, label legibility, and absence of corrosion or heat damage.
• Continuity Testing: Point-to-point continuity verification across all terminal positions to confirm wiring path integrity.
• Isolation Resistance Test: Channel-to-channel and channel-to-earth isolation resistance measured at 500 VDC to confirm dielectric integrity, particularly critical for IS-rated variants.
• Connector Interface Check: Mechanical fit verification of the backplane connector interface to confirm correct mating force and contact engagement with the corresponding Yokogawa I/O module.
• Functional Pairing Test (where test bench available): Terminal block paired with a known-good Yokogawa I/O module and signal loop test performed to verify end-to-end signal transmission.