IS200TDBTH6A | New Surplus GE TDBT PCB H6A

Description

Product Introduction (Anti-Template)

When you’re running a TMR (Triple Modular Redundant) system, every I/O point has to go to three places simultaneously—and that’s exactly what this board handles. The IS200TDBTH6A is GE’s TDBT series termination board, specifically the H6 variant, designed to interface DSPX processor modules with field wiring in redundant control configurations. This board takes each signal and routes it to three independent processor channels for voting.

The H6 variant is a high-density configuration—more I/O points per board than the H4 or other variants. The ‘A’ revision represents minor refinements: improved labeling, updated component selection, and better grounding on the TMR signal paths. Compared to the TDBS series (simplex applications), the TDBT boards include the dedicated routing and isolation needed for triple-redundant systems. This board is a drop-in replacement for the IS200TDBTH6, with no software changes required.

Key Technical Specifications

Compatible Replacement Models

✅ Drop-in Replacement: IS200TDBTH6 — The base revision without the ‘A’ suffix. Identical pinout, mounting, and software interface. The ‘A’ revision includes minor refinements—improved labeling and component updates. No software changes required.

⚠️ Software Compatible: IS200TDBTH4A — A different TDBT variant with lower I/O density. Fits the same slot and backplane but has different channel mapping. You would need to reconfigure the I/O assignment in the Mark VIe software. Budget 4-6 hours for rework.

⚠️ Software Compatible: IS200TDBSH6A — Non-TMR DSPX termination board. Fits the same slot and backplane but lacks TMR routing. Not suitable for redundant applications. Requires complete software reconfiguration of the voting logic.

❌ Hardware Incompatible: IS200TBQGH1A — Excitation termination board. Completely different application and pinout. Not applicable.

Frequently Asked Questions (FAQ)

Q: What’s the difference between the H6 and H4 variants of the TDBT series?

A: The H6 has higher I/O density—more termination points per board. The H4 is a lower-density configuration. The specific channel counts vary by application. Consult the GE documentation to determine which variant matches your cabinet’s I/O requirements.

Q: Can I use a TDBTH6A board in a non-TMR configuration?

A: Yes, but you’re not using the TMR capability. The board will work with a single DSPX module. However, the TDBS series would be more cost-effective if you don’t need redundancy.

Q: What happens if one channel on the TDBT fails?

A: The Mark VIe system detects a mismatch in the voting logic and triggers an alarm. The turbine continues operating on the remaining two channels (2-out-of-3 voting). The board should be replaced at the next maintenance opportunity.

Q: Is the TDBTH6A a direct replacement for the TDBTH6?

A: Yes. Drop-in replacement. No software changes, no wiring changes, no configuration changes.

Q: What’s the difference between TDBS and TDBT boards?

A: The TDBS is for simplex (non-redundant) applications. The TDBT is for TMR (triple-redundant) applications. TDBT boards have dedicated routing for three independent processor channels with ground isolation between channels. TDBS boards have a single signal path.

Q: How do I verify I’m getting a genuine TDBTH6A?

A: Check the board weight—it should be about 380 grams for the H6 variant. Look for the GE holographic security label. Verify the ground isolation between channels using a multimeter (should be >10MΩ). Counterfeit boards often have poor channel isolation.

Q: What bench testing should I do before installing a TDBTH6A?

A: Standard TDBT protocol. First, visual inspection. Second, verify continuity between each terminal block and its corresponding D-sub pin for all three TMR channels. Third, measure insulation resistance between channels (>10MΩ). Fourth, verify ground isolation by measuring resistance from each channel’s ground to the board’s mounting holes. Fifth, perform a signal injection test on each channel and verify it appears at the correct D-sub pins.

Q: Is the TDBTH6A hot-swappable?

A: We strongly advise against hot-swapping TMR boards. Removing a board in a live system can cause transients affecting the voting logic on the other channels. Power down the cabinet segment before swapping.

Q: Where do I find the official wiring diagram for the TDBTH6A?

A: GE document GEK-130536 covers the TDBT series. The H6 variant is detailed in the section specific to that configuration. Pay special attention to the TMR channel assignments—each channel has dedicated terminals with different pinouts. Always cross-reference against your cabinet’s as-built drawings.

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