Description
GE IS200STCIH6AED | Contact Input Terminal Board | Mark VIe Turbine Control
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | IS200STCIH6AED |
| Manufacturer | GE General Electric |
| Control Platform | Mark VI / Mark VIe |
| Functional Designation | STCI |
| Product Type | Contact Input Terminal Board |
| Input Type | Discrete contact inputs |
| Number of Inputs | 24 |
| Nominal Excitation | 24, 48, or 125 VDC |
| Input Threshold | Approximately 50% of applied excitation |
| Associated I/O Pack | PDIA |
| Mounting | DIN-rail / panel mounting arrangement |
| Signal Conditioning | Noise and surge suppression |
| Field Interface | Screw-terminal connections |
| I/O Pack Connection | D-type interface |
| Board Revision | A-family base board; AED configured suffix |
Current technical documentation identifies the H6A STCI board as a 24-point contact-input terminal assembly supporting nominal 24, 48, and 125 VDC excitation. The contact-input threshold is approximately 50% of the respective excitation voltage.
GE’s certification documentation independently lists IS200STCIH6A among approved Mark VIe industrial-control models, supporting its identification as part of the GE turbine-control hardware family rather than a generic PLC input card.
Product Introduction
The GE IS200STCIH6AED is an STCI contact input terminal board used in GE turbine control architecture. Its job is to terminate and condition discrete field contacts before the signals are processed by the associated PDIA I/O pack. Typical signals include switch states, relay contacts, permissives, alarms, and equipment status indications.
The GE IS200STCIH6AED should not be treated as a standalone PLC digital-input module. The terminal board forms part of the Mark VI/Mark VIe I/O signal path, and the installed I/O pack, field excitation, wiring arrangement, and system configuration all matter when selecting a replacement.
IS200STCIH6AED
Application Scenarios & Field Pitfalls — Engineer’s Perspective
Engineering Pain Point
The biggest replacement risk is ordering an STCI board based only on the generic phrase “digital input.” GE produced multiple terminal-board configurations with different electrical characteristics and I/O-pack relationships. The complete part number and installed I/O architecture need to be matched.
Typical Applications
- Turbine discrete-status acquisition — Monitoring field switches, auxiliary contacts, and relay states.
- Permissive and interlock circuits — Bringing contact-based conditions into Mark VI/Mark VIe turbine logic.
- Alarm monitoring — Acquiring discrete alarm and equipment-status signals.
- Turbine control cabinets — Providing the field-side interface for a PDIA-based discrete-input channel group.
Technical Pitfalls to Avoid
- Do not publish 24 VDC as the only input voltage. The H6A configuration is documented for nominal 24, 48, and 125 VDC excitation. A listing that simply says “24 VDC digital input” is incomplete.
- Do not confuse the terminal board with the I/O pack. The STCI board provides the field termination/interface, while the PDIA is the associated I/O processing hardware. Treating the STCI as a standalone processor can lead to an incorrect replacement.
- Verify the excitation and wiring before energizing. The input threshold is approximately 50% of the applied excitation voltage, so field circuit voltage and common wiring should be checked against the existing configuration.
- Match the complete suffix. The base IS200STCIH6A and the full IS200STCIH6AED should not automatically be treated as interchangeable simply because the functional family is the same. Record the complete nameplate designation and installed I/O-pack configuration.
Related Products
- IS200STCIH6A — Base H6A STCI contact input terminal-board designation; the AED version should be matched against the installed configuration.
- IS200STCIH4A — Related STCI contact-input board with a different configuration; not an automatic substitute. GE’s certification records list both H4A and H6A models.
- IS200TBCIH2C — Mark VI contact-input terminal board used in another terminal-board architecture.
- IS200TBCIH3C — Related Mark VI contact-input terminal-board variant.
- IS200TBCIH1C — Another GE Mark VI contact-input interface; verify voltage and I/O architecture before substitution.
- IS220PDIAH1A — PDIA discrete I/O pack associated with compatible Mark VIe contact-input terminal boards; this is the processing device rather than the STCI terminal board.
- IS220PDIAH1B — Related PDIA I/O pack variant with different certification/configuration considerations.
- IS200TBCIH4C — Another Mark VI contact-input terminal configuration.
Procurement Note
For a replacement GE IS200STCIH6AED, purchase against the complete part number, not simply “STCI H6A.” Confirm the terminal-board marking, revision/suffix, associated PDIA I/O pack, field excitation voltage, and terminal wiring before installation.
There are several unreliable descriptions online for this part. Some identify it as a generic digital-input module, while others give unsupported values such as 24 VDC-only operation, 2 A per channel, or unrelated PLC functions. Those claims should not be used for engineering substitution. The better-supported identification is a 24-point STCI contact input terminal board for GE turbine-control systems, with nominal 24/48/125 VDC contact excitation and PDIA integration.
For surplus or previously installed hardware, inspect the terminal area for heat damage, loose field terminals, corrosion, and evidence of surge exposure. Also verify the I/O-pack ID information after installation; the terminal board and I/O pack form one signal path, so replacing only the visible board does not by itself prove system compatibility.
