GE IS200STCIH6A – Simplex Contact Input Terminal Board for Mark VI Discrete Signaling

The GE IS200STCIH6A is a Simplex Contact Input terminal board used in GE Mark VI turbine and process control systems to bring field dry/wet contacts into the controller reliably. From my experience, teams use this board to collect status from limit switches, pressure switches, and relay contacts across turbines, auxiliaries, and BOP skids, then route those signals cleanly back to the Mark VI. You might notice that the H6A hardware option typically indicates a specific wetting-voltage configuration—plants often standardize on 24, 48, or 125 VDC—so it’s worth confirming the exact wetting range on your installed base or drawing set before ordering.

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Key Features

• Simplex discrete input aggregation – Brings multiple field contact signals into the Mark VI with stable isolation and filtering.
• Wetted-contact compatibility – Typically used with plant-standard wetting supplies (often 24/48/125 VDC); the H6A option aligns to a defined wetting range.
• Noise suppression designed for industrial cabinets – Helps reduce nuisance transitions from EMI or long cable runs, which is common in turbine decks.
• Barrier-type terminals – Easier field wiring with ring/fork lugs; cleaner maintenance work and quicker swaps in outage windows.
• Direct interface to Mark VI backpanel – Ribbon connectors link to the associated I/O in the control core, minimizing additional hardware.
• Service-friendly – No firmware on the terminal board; routine checks are largely visual and electrical, which speeds troubleshooting.

Technical Specifications

Related or Supporting Products

• GE IS200STCIH1A / H2A / H4A – Other STCI hardware options with different wetting/voltage arrangements. If your drawings list a different H-option, match it directly.
• GE IS200STCOH* – Simplex Contact Output terminal board for driving relays/solenoids; pairs with STCI when you need both input and output at the same location.
• Mark VI I/O interface boards – The STCI mates via ribbon to the controller-side I/O; ensure the I/O board and firmware revision in the core matches your terminal board option.
• Field accessories – Panel-rated ring lugs, shielded multi-core cable, and appropriately sized DC wetting supply improve noise margin and reliability.

Installation & Maintenance

One thing I appreciate is how straightforward the field wiring is, but the basics still matter. Install the board in a clean, ventilated cabinet that meets the Mark VI rack layout. Keep DC wetting supply polarity consistent across channels, and land shields on the designated ground points to reduce induced noise. Use ring or fork lugs and torque to spec; it seems to cut down on intermittent contact faults in many cases.

• ESD precautions: handle as a static-sensitive assembly; store in shielded bags during outage work.
• Cable routing: separate high-voltage or high-current cabling from low-level signal bundles; maintain shield continuity.
• Power/wetting check: verify the H6A option’s wetting voltage matches drawings before energization; measure at terminal level.
• Routine maintenance: visually inspect terminals for looseness or discoloration; clean dust with dry air; re-torque terminals during planned outages.
• Firmware notes: the terminal board itself has no firmware; any logic changes or updates occur in the controller or I/O pack.

Simulated customer feedback from a recent retrofit: “Swapping to the H6A option went smoothly. We matched the wetting supply to 125 VDC per our legacy spec and the nuisance contact chatter we had before disappeared.”

Quality & Certifications

• Manufacturer standards: GE Mark VI ecosystem; typically produced under ISO 9001 quality systems
• Compliance: CE and UL/CSA conformity is common for Mark VI cabinet assemblies; RoHS status can vary by vintage and region
• Warranty: 12 months (365 days) from shipment under our terms

If you need us to cross-check the H6A option against your exact wetting voltage and channel count on the drawings, send a snapshot of the I/O list or the terminal plan. It usually takes just a few minutes to verify compatibility and ship the right board the first time.