The VME Card That Reads Your Thermocouples

Every exhaust, bearing, and wheelspace temperature your Mark VI shows an operator was digitized somewhere — and for thermocouples, that somewhere is the VTCC. The IS200VTCCH1B is GE's Thermocouple Processor Board for the Speedtronic Mark VI: a card that lives in the VME processor rack and accepts 24 thermocouple inputs of type E, J, K, S, or T. The thermocouples themselves land on two terminal blocks of the TBTC terminal board out in the panel; cables with molded, latching connectors bring those signals from the TBTC to the lower J3 and J4 connectors on the VME rack, where this card reads them.

The VTCC does real signal processing, not just conversion. Per GE's documentation it performs software linearization for each thermocouple type, applies cold junction compensation using reference devices associated with each cable connector, and — usefully for troubleshooting — removes any thermocouple that drifts outside hardware limits from the scan so one failed sensor cannot corrupt neighboring channels. The TBTC side is available in simplex and TMR versions, so the same card architecture serves single-channel and triple-redundant systems; in TMR builds the terminal board fans the same inputs to the <R>, <S>, and <T> sections.

Sensor, Cable, or Card? Prove It Before You Buy

Thermocouple complaints have a well-earned hierarchy of suspects, and the card is at the bottom of it:

• One bad channel: almost always the thermocouple or its extension wiring. Check polarity and measure loop resistance at the TBTC terminal block — the documented limit is 450 ohms two-way, with runs permitted up to 300 m (984 ft) from the cabinet.
• A block of channels bad together: the 24 inputs reach the card through two cables (J3 and J4). If the dead channels group by connector, reseat and inspect that cable and its latching connector before anything else.
• All 24 channels gone: now the card, its seating in the rack, or the rack itself is in play. Check the three front-panel LEDs — run (green), fail (red), and status (orange) — before pulling hardware.
• Every reading offset by a similar amount: that pattern points at cold junction compensation rather than 24 simultaneously failed sensors. Documentation notes a one-degree error in cold junction reading produces a one-degree error in the reported temperature.
• In TMR systems: compare the same input across <R>, <S>, and <T>. Since the TMR terminal board feeds all three sections from the same sensors, the section that disagrees is the one whose card or cable deserves attention.

IS200VTCCH1BBB Part Number Breakdown

Read it as IS200 (board series) + VTCC (the thermocouple processor function; the leading V is the giveaway that this is a VME rack card rather than a T-prefix terminal board) + H1 (hardware group) + B (functional revision), with the final BB tracking the manufactured revision on the label. The H1 group covers thermocouple types E, J, K, S, and T; GE documented a separate H2 group for types B, N, and R and for extended millivolt ranges. Published sources do not spell out the engineering differences between the H1B and H1C functional revisions, so the safe practice is to match the revision letter your system already runs, or send us both numbers to check. Full context on GE's numbering is in the GE Speedtronic Part Number Decoder.

TBTC, DTTC, and the Mark VIe Successor

This card never works alone: it is the VME-side reader for the TBTC thermocouple terminal board, and documentation also lists the DTTC DIN-rail thermocouple board as a compatible input source. When plants migrate to Mark VIe distributed I/O, the same thermocouple termination concept carries forward but the reader changes — an IS220PTCC I/O pack mounts at the terminal board in place of a rack card. If you are weighing that path, our guide Mark V vs Mark VI: DS200 to IS200 covers how GE's generations map onto each other, and the GE Mark VI IS200 Boards collection holds the neighboring cards and terminal boards.

How to Request a Quote We Can Turn Around Fast

• Full part number with suffix — this listing is IS200VTCCH1BBB — plus a photo of your existing card's label
• Turbine model and Speedtronic generation, and simplex vs TMR
• The terminal board type it reads (TBTC or DTTC) if known
• Quantity, condition preference, and urgency — forced outage requests get flagged accordingly

New Surplus IS200VTCCH1B in Original GE Packaging

This card is new surplus in its original factory packaging, warranted as stated in the table below. Use Request a Quote and we will reply within 24 hours with availability and lead time. We ship worldwide under DDP terms and accept purchase orders.

General Information about the Product
Part Number	IS200VTCCH1B Mark VI IS200
Description	GE General Electric IS200VTCCH1B IS200VTCCH1BBB Thermocouple Input Board NEW
Condition	newSurplusFactoryPackage Original Factory Packaged. With 1 Year Warranty.