Description
GE IS200TBCIH2C
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | |
| Manufacturer | General Electric |
| Product Type | Contact Input Terminal Board |
| Control Platform | Mark VI / Mark VIe |
| Input Type | Dry/contact discrete inputs |
| Number of Inputs | 24 |
| Nominal Input/Excitation | 24 VDC for H2 configuration |
| Input Filtering | Approx. 4 ms hardware filter |
| Terminal Blocks | TB1 / TB2 |
| Terminal Connections | 24 screw positions per terminal block |
| I/O Connectors | JR1, JS1, JT1 |
| Connector Type | DC-37 |
| Power Connectors | JE1 / JE2 |
| Wiring Capacity | Up to approximately #12 AWG |
| Hardware Settings | No user jumpers or hardware configuration switches |
| Mounting | DIN rail |
| Typical I/O Pack | IS220PDIAH1A / IS220PDIAH1B |
| Application | Turbine control discrete/contact input termination |
The board incorporates input filtering and surge suppression at the signal-entry points. Documentation also indicates that the terminal board itself has no jumpers or hardware settings, with configuration and diagnostics handled through the associated control system/I/O electronics.
Product Introduction
The is a contact input terminal board used in GE Mark VI/Mark VIe turbine control systems. Its primary job is to terminate and route 24 discrete contact signals between field wiring and the associated discrete I/O electronics. The board uses two removable terminal blocks and three DC-37 connections, allowing it to serve simplex or higher-redundancy control architectures depending on the installed I/O arrangement.
For replacement work, the important detail is that is not the actual discrete input processor. It is the termination/interface board paired with an appropriate I/O pack. GE’s documentation explicitly identifies the board as an accessory for the IS220PDIAH1A Mark VIe discrete input module and also documents compatibility with IS220PDIAH1B.
IS200TBCIH2C
Engineering Pain Point
The most common procurement mistake is treating the TBCI board and its associated I/O pack as interchangeable components. They are separate pieces of the I/O chain. Replacing an with a visually similar TBCI/STCI board without checking the I/O pack, redundancy arrangement, excitation voltage, connector assignment, and system generation can create an installation that physically fits but does not operate correctly.
Typical Applications
- Gas and steam turbine control: Termination of discrete field contacts such as permissives, status signals, switches, and interlocks.
- Mark VIe discrete I/O: Interface between field wiring and IS220PDIAH-series discrete input packs.
- Simplex I/O arrangements: JR1 can be used for the I/O connection in a simplex configuration.
- TMR control architectures: JR1, JS1, and JT1 provide the corresponding connections for redundant I/O arrangements where supported.
Technical Pitfalls to Avoid
- Verify the H2 suffix. The H2 version is associated with the lower-voltage contact-input arrangement. Do not assume that another TBCI variant has the same excitation requirements.
- Match the I/O pack. GE documentation identifies IS220PDIAH1A and IS220PDIAH1B as compatible Mark VIe discrete input packs for this terminal-board family.
- Check simplex versus TMR wiring. The three DC-37 connectors are not simply spare communication ports. Their use depends on the control-system redundancy architecture.
- Do not confuse terminal count with channel count. The two terminal blocks have 24 screw connections each, while the board provides 24 contact-input channels.
- Check the field excitation source. The input circuit depends on the specified contact excitation arrangement. Confirm the installed control-system drawings before applying field voltage.
- Inspect connector identification before removal. JR1, JS1, JT1, JE1, and JE2 have different functions. Label every cable and power connection before exchanging the board.
Related Products
- IS220PDIAH1A — Mark VIe discrete input I/O pack used with in GE documentation.
- IS220PDIAH1B — Later Mark VIe discrete input I/O pack documented with the TBCIH2C terminal board.
- IS200TBCIH4C — Related TBCI terminal-board variant with a different configuration; verify input/excitation requirements before substitution.
- IS200STCIH1A — Mark VIe discrete I/O terminal board in the same general application family.
- IS200STCIH2A — Related Mark VIe I/O terminal board; not automatically interchangeable with TBCIH2C.
- IS200TBCIS2C — Mark VIeS safety discrete-input terminal board; intended for the safety I/O architecture and should not be treated as a conventional Mark VIe replacement.
Procurement check: For , verify the board revision, installed I/O pack, control-system generation, simplex/TMR architecture, field excitation voltage, and all JR/JS/JT/JE connections against the site drawings. GE documentation confirms the board’s Mark VIe discrete-input application, but that does not make every TBCI-family board a drop-in substitute.
