Is It Really the IS200TBCIH1B? Troubleshoot First

Because a contact input terminal board sits between the field and the intelligent hardware, engineers often order a replacement IS200TBCIH1B when the real fault lies elsewhere. This board leans passive: it terminates dry contacts and conditions their signals, but it makes no decisions. Work through these checks before you condemn it:

• A single point acting up? Look at the field first. A switch that will not make, a corroded ferrule, or moisture in a junction box behaves exactly like a bad input at the cabinet. Ring out the loop and the contact.
• A whole block of inputs gone at once? That pattern points at the mating pack or its cable, not the terminal board. On Mark VIe that is a PDIA I/O pack; on Mark VI it is the VME contact processor (VCRC/VCCC) and the ribbon feeding it.
• Every point reading identically? Suspect the contact excitation (wetting) supply. Without it the pack cannot separate open from closed.
• Intermittent after a bump or a PM? Reseat and inspect the JR1/JS1/JT1 connectors and check for bent pins before you assume a board failure.

Genuine terminal-board failures do occur — cracked barrier blocks, burnt or corroded terminals, physical damage to the surge-suppression components — and those are worth replacing. The goal is simply to confirm the board is the fault and not the messenger before it comes out of the cabinet.

What the TBCI Board Does in a Mark VI Cabinet

The IS200TBCIH1B (TBCI = terminal board, contact inputs) accepts up to 24 dry contact inputs on two barrier-type terminal blocks that unbolt from the board for maintenance, each terminal taking wire up to #12 AWG. The board provides the DC power that excites those contacts and adds noise-suppression circuitry to reject surge events and high-frequency interference on long field runs. Conditioned signals then travel to the processing hardware: in Mark VI through molded-plug cables to the VME rack, and in Mark VIe directly into PDIA discrete-input packs seated on the board. In a triple-redundant installation the three connectors feed the <R>, <S> and <T> control channels; a simplex point uses only the first connector.

Suffix and Revision: Decoding IS200TBCIH1BCE

Read the number left to right. IS200 marks the Mark VI board series, TBCI the contact-input function, H1 the hardware group (documented at 125 V dc excitation), B the functional revision, and the closing CE the specific artwork revision of this assembly. IS200TBCIH1BCD and IS200TBCIH1BCE are the same H1B board at different production revisions. GE treats the H1B and H1C boards as functionally interchangeable, but if you are seating PDIA packs in a Mark VIe system the C-version board is specified for correct mechanical alignment — and the exact revision still governs connector keying and the ID device your pack reads, so always match the full string. The GE Speedtronic Part Number Decoder breaks the naming down segment by segment.

Where It Connects and What Sits Around It

In the discrete-input tier the IS200TBCIH1B pairs with the VCRC or VCCC processor in a Mark VI VME rack, or with PDIA packs in Mark VIe, and shares the cabinet with the relay-output and analog terminal boards of the same family. For plants running both control generations, the Mark V vs Mark VI: DS200 to IS200 guide explains why the earlier DS200 contact hardware is not interchangeable with IS200. You can view comparable terminations in the GE Mark VI IS200 Boards collection.

Details That Make Your Quote Accurate

Send us the full part number with suffix (IS200TBCIH1BCE), the revision on the board’s printed label, a photo of that label, the turbine model and control generation the board serves, the quantity, and your required timing. If you can add a photo of the connectors and terminal blocks on the board you are replacing, we can confirm it matches before anything ships.

Request Your IS200TBCIH1BCE Quote

This IS200TBCIH1B ships worldwide on a DDP basis, with a quote back to you inside 24 hours and purchase orders welcome from qualified end users and integrators. Click Request a Quote, tell us the quantity, and we will confirm stock and lead time.

This IS200TBCIH1BCE at a Glance

General Information about the Product
Part Number	IS200TBCIH1B Mark VI IS200
Description	GE General Electric IS200TBCIH1B IS200TBCIH1BCE Input Terminal Circuit Board
Condition	used Cleaned and Tested. With 1 Year Warranty.