The Yokogawa SEA4D-11, also cataloged as the SEA4D-11 Safety Interface Terminal Board, operates as a dedicated hardware component for high-integrity signal transition and diagnostic isolation within ProSafe-RS Safety Instrumented System networks. The high-density termination sub-assembly conditions and routes 32 discrete analog paths natively at the hardware tier to link field instrumentation directly with safety-critical control logic.
Hardware Specifications
Parameter
Specification
Model
SEA4D-11
Brand
Yokogawa
Series
ProSafe-RS Safety Instrumented System (SIS)
Origin
Japan
Weight
1.5 kg net hardware component mass
Input Channels
16 x 2 layout configuration (32 points, high-density matrix)
Termination Interface
Heavy-duty M4 industrial screw terminal blocks
Compatible I/O Module
SAI143 Safety Analog Input Module
Physical Interconnect
Dedicated KS1 interface cable assembly
Dielectric Strength
500 V AC continuous galvanic test threshold for 1 minute
Insulation Resistance
>= 100 MΩ when verified at 500 V DC
Product Type
Safety Interface Boards
High-Reliability Safety Control (SIS)
SIL3 Certification and 2oo3 Architecture Support The interface board is constructed to meet strict SIL3 certification constraints when combined with ProSafe-RS safety processors. The dual-path 16 x 2 channel mapping layout maintains complete signal segregation, allowing the hardware to feed parallel input streams directly into a triple modular redundancy (TMR) 2oo3 architecture voting loop without cross-channel data contamination.
Galvanic Isolation and Fail-Safe State Execution The internal hardware traces feature high dielectric boundaries that deliver robust galvanic isolation, measured at 500 V AC, between field terminals and logic bus tracks. This high-isolation barrier blocks high-voltage surges, noise induction, and transient ground faults from entering the active processing circuits, ensuring predictable fail-safe state execution during critical emergency shutdown (ESD) or fire and gas (F&G) loops.
