IS200TBCIH1B in the GE Mark VI Contact Input Chain

The IS200TBCIH1B is a contact input terminal board from the GE Speedtronic Mark VI (IS200) family. Its role in the turbine control system is termination and signal conditioning: it lands up to 24 dry-contact field signals — breaker auxiliaries, limit and pressure switches, hand-station contacts, permissive strings — on two barrier-type terminal blocks and passes the conditioned signals to the processing hardware over a cabled connection. The board carries no application logic of its own. It supplies the DC excitation (wetting) voltage that lets the mating pack sense whether each remote contact is open or closed, and it adds surge and high-frequency noise suppression so a long field run does not create false transitions.

Where the board sits depends on the vintage of the control. In a Mark VI (VME) cabinet the IS200TBCIH1B connects through molded-plug cables to the contact-input processor in the VME rack — GE documents the VCCC/VCRC boards in that role, with the VCRC handling discrete inputs and relay outputs across several terminal boards. In a Mark VIe migration the same terminal board is served by PDIA discrete-input I/O packs that plug directly onto it. One, two, or three feeds are used depending on whether the point is wired simplex or triple-redundant.

Diagnose the Fault Before You Replace the Board

A contact input terminal board is largely passive, so a symptom that looks like a dead TBCI is usually somewhere else. Before you pull the board, work outward from the signal:

• The field contact and wiring. A point stuck open or closed most often traces to the device in the field, a loose terminal, or a wet or corroded junction — not the board. Meter the contact and the loop before condemning the termination.
• The mating pack or VME card. If a whole group of inputs drops at once, or the toolbox flags a card/pack fault, suspect the PDIA pack (Mark VIe) or the VCRC/VCCC processor (Mark VI) and its cable rather than the terminal board.
• The excitation and power feed. Loss of the contact excitation supply makes every point read the same — verify the DC feed before assuming the board failed.
• The connector. A partially seated or damaged JR1/JS1/JT1 plug, or a bent pin, can mimic a board failure. Inspect the plug and its keying before replacement.

Replace the terminal board when you have visible damage — cracked barrier blocks, burnt traces, corrosion on the silver terminals, or heat marks around the noise-suppression components — or when the board fails an isolated point-by-point check against a known-good pack.

Reading the IS200TBCIH1BCD Part Number

GE IS200 numbers are read in segments. IS200 identifies the Mark VI printed-wiring assembly; TBCI is the functional acronym for the contact-input terminal board; H1 is the hardware group; the letter that follows (here B) is the functional revision; and the trailing pair on the full number — the CD in IS200TBCIH1BCD — identifies the board artwork/production revision. The H1 group is documented at 125 V dc contact excitation. When you order, quote the complete string including those last two letters so we match the revision and the connector/ID keying your rack expects. Our GE Speedtronic Part Number Decoder walks through each segment.

Companion Boards and I/O Packs

On the same discrete-I/O tier you will typically find the mating VCRC/VCCC VME processor (Mark VI) or PDIA packs (Mark VIe), plus the relay-output and analog terminal boards that share the cabinet. If you are standardizing a fleet that spans control generations, the Mark V vs Mark VI: DS200 to IS200 guide explains why a Mark V DS200 contact board is not a drop-in for this IS200 hardware. Browse related terminations in the GE Mark VI IS200 Boards collection.

What to Send Us for a Fast Quote

To match the right board the first time, include the full part number with suffix (IS200TBCIH1BCD), the revision printed on the board label, a clear photo of that label, your turbine model and Mark VI generation, the quantity you need, and how urgently the unit is required. A photo of the existing board’s connectors and terminal blocks helps us confirm compatibility.

Request a Quote on This IS200TBCIH1B

We supply the IS200TBCIH1B worldwide on a DDP basis, return quotes within 24 hours, and accept purchase orders from qualified plants and EPCs. Use the Request a Quote button with your part number and quantity, and our team will confirm availability and lead time.

IS200TBCIH1BCD Listing Details

General Information about the Product
Part Number	IS200TBCIH1B Mark VI IS200
Description	GE General Electric IS200TBCIH1B IS200TBCIH1BCD Terminal Board Mark VI
Condition	used Clean and Tested. With 1 Year Warranty.