GE IS200TBTCH1BBB Thermocouple Terminal Board – Mark VI Simplex/Redundant Control System

Technical Dossier

Product Details And Specifications

GE IS200TBTCH1BBB Thermocouple Terminal Board – Simplex/Redundant Mark VI Control Platform

The GE IS200TBTCH1BBB is a precision Thermocouple Terminal Board (TBTCH) engineered for the GE Mark VI Turbine Control System (Turbine Control System, TCS). Within the Mark VI distributed control architecture, this board serves as the primary signal conditioning and termination interface for thermocouple-type temperature sensors, converting millivolt-level thermoelectric signals into digitally processable data for the core I/O processor modules. Its role is critical in the thermal monitoring loop of gas turbines, steam turbines, and combined-cycle power generation units, where accurate temperature measurement directly governs combustion control, exhaust temperature protection, and turbine trip logic under SIL-rated safety instrumented system (Safety Instrumented System, SIS) frameworks.

The IS200TBTCH1BBB is designed to operate in both Simplex and Redundant system configurations within the Mark VI platform, making it compatible with IEC 61508 and IEC 61511 functional safety requirements. In redundant deployments, the board interfaces with the TCEA/TCEB/TCEC I/O pack triplex architecture, supporting 2oo3 (Two-out-of-Three) voting logic for temperature channels. This ensures that a single-channel failure does not propagate to a spurious trip or undetected dangerous failure, maintaining the diagnostic coverage (Diagnostic Coverage, DC) levels required for SIL 2 certification in turbine protection applications.