Product Overview

The General Electric IS200TRLYH1B is a high-reliability Relay Output Terminal Board engineered for the Mark VIe Speedtronic™ turbine control system. This module is specifically designed for Triple Modular Redundant (TMR) applications, where maximum system availability and fault tolerance are mandatory. The board facilitates 12 contact-voted relay outputs by utilizing a specialized array of 36 sealed relays (12 relays for each of the R, S, and T control sections). By voting the signals across three independent processors, the IS200TRLYH1B ensures that a single processor or relay failure does not cause an accidental trip or a failure to actuate, making it a cornerstone for critical safety and control interlocks in power generation environments.

Technical Characteristics

The IS200TRLYH1B is characterized by its rigorous voting logic and robust electrical isolation:

TMR Contact Voting Architecture The board implements hardware-level voting for 12 discrete output channels. Each output is the result of combined contacts from the R, S, and T sections. In this "H1B" configuration, the voted contacts provide a Form B (Normally Closed/NC) output, distinguishing it from the "Form A" variants used for different logic requirements.

Independent Power Railing To prevent common-mode failures, power for the relay coils in each section (R, S, and T) is supplied independently by its respective I/O processor through the JR1, JS1, and JT1 plugs. This isolation ensures that an electrical fault in one section cannot propagate to the others, maintaining the integrity of the voting logic.

Versatile Load Handling The board is designed to switch a variety of field loads, supporting 24 VDC, 125 VDC, or 115 VAC. While the TRLY board does not include onboard power distribution for field solenoids, it is fully compatible with optional external distribution boards like the IS200WPDFH1A/H2A to provide fused power for field devices.

Hazardous Location Certification The IS200TRLYH1B is built with sealed relay components, making it suitable for deployment in Class 1, Division 2 hazardous areas. This allows the terminal board to be mounted in close proximity to turbine equipment where flammable gases may occasionally be present.

Direct Processor Interfacing The board acts as a direct landing point for I/O processor signals. The relay drivers are controlled directly by the digital outputs of the Mark VIe controllers, ensuring millisecond-level response times for emergency shutdown (ESD) and process interlock sequences.

Technical Specifications

• Manufacturer: General Electric (GE)

• Model Number: IS200TRLYH1B

• Series: Mark VIe Speedtronic™

• System Configuration: Triple Modular Redundancy (TMR) Only

• Output Channels: 12 Voted Relay Outputs

• Contact Form: Form B (Normally Closed)

• Relay Count: 36 Total (12 per R/S/T section)

• Voltage Compatibility: 24/125 VDC or 115 VAC

• Weight: 1.4 kg

• Dimensions: 33 x 17.8 x 5.5 cm

• Origin: USA

Application Areas

The IS200TRLYH1B is a critical component for high-availability control in:

• Gas & Steam Turbines: Managing critical trip solenoids and fuel valve interlocks.

• Emergency Shutdown (ESD) Systems: Providing fail-safe Normally Closed contacts for safety loops.

• Generator Protection: Interfacing with breaker trip coils and excitation lockout relays.

• Process Safety: Executing TMR-voted logic for hazardous chemical or power utility processes.