GE IS200TBCIH21CD – Contact Input Terminal Board for Mark VI Discrete Signals

The GE IS200TBCIH21CD is a contact input terminal board from the Mark VI family, designed to bring field dry-contact status points into the turbine control system cleanly and reliably. From my experience, you’ll typically see this board wired to permissives, limit switches, pressure or level switches, and other on/off devices around gas and steam turbine auxiliaries. One thing I appreciate is how stable these inputs are in noisy panels; the conditioning and layout seem to handle industrial environments well.

In many cases, the “H” TBCI variants are paired with 125 Vdc wetting on the inputs, while maintaining a straightforward, barrier‑terminal wiring style that technicians are comfortable with. A maintenance lead recently told us their swap took under 30 minutes, largely because the terminal layout matches the original harnessing and there’s no firmware to touch on the board itself.

Order Placement Process and Guarantees

• Warranty: 365 days from delivery
• Lead time: typically 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• Mark VI discrete input termination – Routes multiple dry-contact signals from field devices into the controller.
• Wetted input style – Typically used with 125 Vdc input wetting on “H” variants for robust, long-cable installations.
• Noise-tolerant design – Input conditioning and layout that, in most cases, help reduce nuisance picks in high-EMI cabinets.
• Barrier screw terminals – Straightforward field wiring with clear channel grouping and common returns.
• Passive board (no firmware) – No configuration on the board itself; it mates to the Mark VI I/O cardset via plug/ribbon connectors.
• Service-friendly – Board-level replacement without disturbing the controller, typically minimizing downtime.

Technical Specifications

Related or Supporting Products

• IS200TBCIH1C / IS200TBCIH1B – Earlier revisions in the same contact input board family; typically interchangeable within like wetting styles. Verify connector keying and revision before mixing.
• IS200TBCIH2C – Alternate revision used in some redundant Mark VI cabinets. Channel function is similar; check system part lists for fit.
• IS200TBCA… series – Contact input terminal boards oriented to 24 Vdc wetting in many cases; suitable where low-voltage field supplies are standard.
• Mark VI I/O cardset – The TBCI mates to the corresponding Mark VI discrete input acquisition modules via ribbon/plug cables (no changes to field wiring required).

You might notice that minor suffix differences (e.g., 1C, 2C, 21CD) reflect manufacturing or revision updates rather than a function change. That said, it’s best practice to match the BOM exactly for turbine and safety-critical applications.

Installation & Maintenance

• Cabinet requirements – Install in a clean, ventilated control cabinet. Keep low-voltage I/O cabling separate from high‑current motor feeders.
• Wiring – Use properly sized, shielded twisted-pair where specified by your site standard. Torque terminals to spec and label channels to match the Mark VI I/O map.
• Grounding & noise control – Bond cable shields at the cabinet end as per GE guidelines; avoid multi‑point shield terminations that can create ground loops.
• Safety – Isolate the wetting supply (commonly 125 Vdc) before servicing. Verify absence of voltage with a calibrated meter.
• Routine checks – Periodically re‑torque terminals, inspect for discoloration or loosened conductors, and clean dust using dry, oil‑free air. Run Mark VI diagnostics to confirm channel states.
• Spares strategy – Keeping one or two like‑for‑like spares on site typically shortens outage recovery; store in anti‑static packaging in a climate‑controlled room.

Quality & Certifications

• Manufactured for GE Mark VI systems; produced under ISO 9001 quality systems (typical for this product class).
• CE-compliant control system environment; UL/cUL recognition is commonly applied at the system or subassembly level.
• RoHS applicability varies by revision and region; confirm if your site requires a specific compliance statement.
• Warranty: 365 days standard.