GE IS200TBAIS1C Mark VIe Analog Input/Output Terminal Board

Configured for analog signal processing in Mark VIe safety-integrated systems, the GE IS200TBAIS1C (IS200TBAIS1C Analog Input/Output Terminal Board) provides direct physical/electrical execution. This terminal board supports both simplex and triple modular redundancy (TMR) configurations, managing thermocouple, current loop, and voltage signals while facilitating precise current regulation through integrated shunt measurement circuitry.

Hardware Specifications

Triple Modular Redundancy (TMR) and Fail-Safe Execution

The IS200TBAIS1C is engineered for safety-certified applications within the Mark VIeS SIS environment. In TMR 2oo3 configurations, the terminal board enables signal fanning, where inputs are distributed across the R, S, and T control channels. The board utilizes an integrated measuring shunt to aggregate current from triple-connected output drivers, providing a composite signal to the I/O processors for accurate setpoint regulation. The design enforces fail-safe state execution, ensuring that in the event of an I/O processor discrepancy, the voter logic maintains the safety-critical state. Note that the 200 mA output option is restricted in YAIC-based SIS applications to ensure compliance with certified safety parameters.

Frequently Asked Questions

Q: Is the IS200TBAIS1C compatible with simplex application topologies?

A: Yes. The board utilizes a dedicated single connector (R1) for simplex applications, while all three DC-37 pin connectors are utilized for TMR configurations to support redundant processing.

Q: How is output current handled in TMR mode?

A: In TMR mode, the terminal board aggregates the currents from the three connected output drivers. An onboard measuring shunt calculates the total current, which is then fed back to the I/O processors to ensure precise regulation to the commanded setpoint.

Field Installation Guidelines

• Interface Cabling: Connect I/O processors to the three DC-37 pin ports. For simplex setups, ensure the R1 port is utilized. For TMR, ensure cabling from all three processors (R, S, T) is verified against the system wiring schematic to prevent signal phase or addressing errors.
• Shielding and Grounding: To maintain safety certification integrity, land all cable shields on the designated terminal board grounding points. Minimize path impedance to the system common earth ground to avoid noise-induced errors in analog measurement circuits.
• Terminal Block Torque: Apply proper torque to the barrier-style terminal blocks when landing field wiring. Loose connections can introduce resistive fluctuations, causing instability in current-loop feedback signals.
• Environmental Considerations: Ensure the installation environment remains within rated limits. Avoid proximity to high-frequency power switching equipment to prevent EMI coupling into sensitive low-level analog inputs.