GE Mark VI IS200STCIH6A IS200STCIH6ADD Contact Module

Product Description

The IS200STCIH6A (including revision IS200STCIH6ADD) is a high-density Discrete Contact Input Terminal Board designed for the General Electric Speedtronic Mark VI control system. This DIN rail-mounted board serves as the primary interface for collecting dry contact signals from turbine auxiliaries, such as limit switches, relay contacts, and protective interlocks. By consolidating 48 channels into a single module, the IS200STCIH6A significantly reduces cabinet footprint while providing robust signal conditioning for critical control logic.

The board is engineered for high-availability industrial environments, featuring per-channel optical isolation to protect the control processors from field-side electrical transients. A standout feature of the IS200STCIH6A is its 1 ms Sequence of Events (SOE) resolution, which allows for millisecond-accurate timestamping of status changes—a requirement for effective post-trip fault analysis and diagnostics. The hardware includes integrated RC filtering to suppress contact bounce and electromagnetic interference (EMI), ensuring that only valid state changes are reported to the controller.

Technical Specifications

• Model Designation: IS200STCIH6A / IS200STCIH6ADD

• Control System: GE Mark VI Speedtronic

• Board Type: Discrete Contact Input (STCI)

• Input Capacity: 48 Dry Contact Input Channels

• Excitation Voltage: 24 VDC Typical (Isolated)

• SOE Resolution: 1 ms (millisecond) event capture

• Isolation Threshold: Optical isolation per channel

• Signal Filtering: Integrated hardware debounce and noise suppression

• Mounting Configuration: Standard DIN Rail Mount

• Terminal Interface: Two 48-point screw-type terminal blocks

• Operating Temperature: -20 °C to +60 °C

• Storage Temperature: -40 °C to +85 °C

• Dimensions: 170 mm x 90 mm

• Shipping Weight: 3.0 kg (including packaging)

• Compliance: IEC 61326-1 EMC industrial standards

Application & System Strategy

The IS200STCIH6A is primarily deployed in gas and steam turbine control cabinets where high-speed discrete feedback is essential. It is typically paired with a V-series I/O processor card via high-density cabling. This module supports both Simplex and TMR (Triple Modular Redundant) system architectures, fanning out field signals to multiple control cores when configured for safety-critical turbine trip logic.

Frequently Asked Questions

What is the difference between the IS200STCIH6A and the H6ADD revision?The IS200STCIH6ADD is a specific revision of the base IS200STCIH6A board. It maintains full functional compatibility but may include updated PCB components or manufacturing optimizations to improve long-term thermal stability in harsh environments.

Can this board handle wet contact inputs?The IS200STCIH6A is specifically designed for dry contact inputs. Applying external wetting voltage without checking the specific terminal board wiring diagram may damage the optical isolation circuitry.