Yokogawa ATT4D-00 S2 Terminal Interface Module

Configured for dual-redundant signal termination in CENTUM VP / CS 3000 Field Control Units, the Yokogawa ATT4D-00 S2 (Yokogawa ATT4D-00 Terminal Interface Module) provides direct physical/electrical execution.

Hardware Specifications

Process Control Integration & Signal Isolation

The ATT4D-00 S2 operates as a passive routing interface between field-level transmitters and internal system I/O modules. The hardware incorporates the following signal-routing capabilities:

• 4-20 mA Loop Path Redundancy: The dual-redundant backplane mapping permits dual signal distribution from 2-wire and 4-wire transmitters to individual active/standby I/O modules, preventing signal interruption during module maintenance.
• Signal Shield and Isolation Mapping: Ensures dedicated grounding terminal routing for channel-to-channel isolation. Common-mode electrical noise is isolated and routed directly to the system protective earth plane without bleeding into adjacent active signal lines.
• Vibration-Resistant Contact Plating: The S2 hardware revision utilizes specific industrial contact plating on all terminal contact springs, preventing contact resistance degradation under continuous physical vibrations.

Frequently Asked Questions

Q: Does the ATT4D-00 S2 require an active power feed to maintain redundant signal routing?

A: No. The terminal interface block is entirely passive. It splits the incoming physical wiring paths via discrete physical copper traces on the module's internal printed circuit board, requiring zero electrical power from the cabinet rails.

Q: What type of wire preparation is needed for the spring-loaded pressure clamps?

A: Standard wire strip lengths between 8 mm and 10 mm are required. Ferruled or solid copper wires ranging from 0.2 mm to 2.5 mm squared can be inserted directly without manual screw-fastener torque operations.

Field Installation Guidelines

• DIN Rail Assembly: Mount the interface block onto standard 35 mm DIN rails inside the field marshalling cabinet. Secure the assembly at both ends with heavy-duty DIN rail end stops to prevent lateral movement during cabinet transport or seismic vibration.
• Cable Shield Termination: Connect external cable shields directly to the signal ground terminals located on the ATT4D-00 S2 block. To avoid ground loop interference, ensure cable shields are not grounded at the transmitter end.
• Wire Routing: Route high-voltage power lines and low-voltage instrument signals in separate cable ducts with at least 150 mm physical clearance to mitigate electromagnetic coupling.
• Environmental Protection: In areas where sulfur dioxide or chlorine exceeds typical industrial baselines, place the terminal module inside a sealed enclosure with an air filtration system matching ISA G3 environmental class guidelines to prevent spring terminal oxidation.