Yokogawa ATA4S-00 S2 Terminal Block

Configured for analog signal termination in CENTUM VP systems, the Yokogawa ATA4S-00 S2 (ATA4S-00 Terminal Block) provides direct physical execution of field-side signal integration for Yokogawa I/O modules.

Suffix Breakdown & Model Matrix

• ATA4S-00: Standard base configuration for analog signal termination.

• S2: Revised hardware revision for enhanced connection stability and mechanical compatibility with modern control cabinet rails.

Hardware Specifications

Process Control and DCS Instrumentation Characteristics

• 4-20 mA HART loop protocol: The terminal block is engineered to maintain low contact resistance, ensuring that the 4-20 mA HART signal loop remains within tolerance. It supports seamless diagnostic data exchange between field instrumentation and the DCS interface.

• Channel-to-channel isolation: The block architecture ensures electrical separation between discrete signal paths. This isolation is necessary to prevent ground loops and common-mode interference when multiple analog signals are terminated within the same assembly.

• Cold junction compensation (CJC): The terminal block assembly functions as a stable interface for thermocouple termination modules. It minimizes thermal gradients at the connection point, allowing the host module to maintain accurate CJC logic during fluctuating ambient temperatures.

• FOUNDATION Fieldbus / Profibus PA connectivity: The physical layout of the block supports the shielding requirements of Fieldbus protocols, preventing signal reflections and ensuring deterministic communication between the field devices and the Yokogawa control network.

Frequently Asked Questions

Q: Is the ATA4S-00 S2 compatible with previous revisions of the ATA4S-00?

A: Yes, the S2 revision is designed for backward compatibility with existing field wiring and I/O module interfaces. It maintains the same physical footprint and terminal logic as the legacy model.

Q: Can this terminal block be used for high-frequency signal switching?

A: This block is designed primarily for analog process signals and low-speed digital I/O. For high-frequency applications, signal integrity should be verified against the host module’s bandwidth specifications to avoid attenuation.

Field Installation Guidelines

• Mounting: Secure the terminal block to the control cabinet DIN rail. Verify that the locking latch is fully engaged to prevent mechanical vibration from compromising the terminal connection or backplane stability.

• Grounding: Bond the terminal block shield connection to the cabinet’s main instrument ground bus. A low-impedance ground is mandatory for maintaining the effectiveness of the EMI shielding and surge current redirection.

• Wiring: Maintain clear separation between analog signal paths and high-voltage power cables. Use shielded twisted-pair conductors and ensure the shield is terminated at a single point to prevent ground loop currents from interfering with the analog signal accuracy.