GE IS200TBCIH2C Contact Input Terminal Board – Reliable high‑voltage discrete sensing for Mark VI turbine control

The GE IS200TBCIH2C is a Mark VI series contact input terminal board designed to bring field dry-contact status signals back to the control system with stable, noise-immune performance. From my experience, this board is chosen when plants standardize on higher wetting voltages (typically 110/125 VDC) for long cable runs or legacy switchgear. It sits in the control cabinet, takes in limit switches, pressure/level switches, relay contacts, and feeds clean, debounced logic back to the Mark VI rack. You might notice that it behaves like a passive field interface—simple to wire, steady in operation, not fussy.

Company’s Order Placement Process and Guarantees

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

Key Features

• High‑voltage wetting (H2C variant): Typically configured for 110/125 VDC contact wetting, suited to long field runs and brownfield panels.
• Robust discrete sensing: Accepts dry contacts from switches and protective relays; onboard filtering helps reject noise and contact bounce.
• Engineered for Mark VI: Mates to the Mark VI I/O through cabled connectors—clean integration with proven turbine controls.
• Group isolation design: Field side isolated from control electronics for better resilience in electrically harsh cabinets.
• Maintenance‑friendly layout: Clearly labeled terminal points; point checks are straightforward during outage windows.
• TMR-ready architectures: In many cases used in simplex, dual, or TMR schemes, depending on the control strategy.

Technical Specifications

Related or Supporting Products

• GE IS200TBCIH1B – Similar contact input board but generally paired with lower wetting voltage options (24/48 VDC are common in many cases).
• GE IS200TBCOH1B – Contact output terminal board for driving solenoids/relays; complements TBCI on the output side.
• GE IS200TBAIH1B – Analog input terminal board; use when bringing 4–20 mA or RTD/thermocouple signals into the same cabinet.
• GE IS200TBAOH1B – Analog output terminal board for current/voltage control outputs.

One thing I appreciate is how the TBCI pairs cleanly with output and analog boards in the same Mark VI section—makes wiring diagrams simpler and future swaps easier. A maintenance lead at a combined‑cycle plant told us the H2C revision “handled 125 VDC wetting on long cable runs without nuisance picks,” which seems to be the typical result when cabinets are properly grounded.

Installation & Maintenance

• Cabinet environment: Mount inside a clean, ventilated control cabinet; keep ambient within 0–60 °C and avoid high humidity/condensation.
• Wetting voltage checks: For H2C, verify 110/125 VDC wetting supply polarity and fusing before landing field wires. Label sources clearly.
• Wiring practice: Use shielded cable for long runs; land shields at one end to prevent ground loops. Separate high‑energy solenoid wiring from low‑level signal bundles.
• Grounding: Ensure cabinet and board ground references are solid; poor bonding is a common cause of sporadic DI chatter.
• Pre‑commissioning: Point‑to‑point continuity checks, simulate open/close on each contact, verify channel states in the HMI/tool.
• Routine maintenance: Tighten terminal screws during outages, inspect for discoloration or loose strands, replace any blown fuses where applicable, and keep the board dust‑free with ESD‑safe cleaning. Firmware updates are not applicable to the terminal board itself.
• Spares strategy: Keep at least one spare TBCI per cabinet row; for TMR systems, consider an extra to reduce outage risk.

Quality & Certifications

• Manufactured for GE Mark VI industrial control applications
• Typical compliance: CE and UL for control panels; RoHS status varies by revision
• Produced under ISO 9001 quality systems (typical for this product family)
• Warranty provided: 365 days