Overview
The GE IS200STCIH6A, also cataloged as the IS200STCIH6A Contact Input Terminal Board, processes discrete contact signals for the Mark VIe control system. This simplex STCI board accepts 24 external contact inputs with nominal excitation ranges of 24 VDC, 48 VDC, and 125 VDC. Input conditioning filters suppress high-frequency noise and limit surge interference before the signals pass through optical isolation to the I/O processor.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IS200STCIH6A |
| Brand | General Electric (GE) |
| Series | Mark VIe |
| Product Type | Simplex Contact Input Terminal Board |
| Input Channels | 24 |
| Input Excitation Ranges | 16-32 VDC, 32-64 VDC, 100-145 VDC |
| Nominal Input Voltages | 24 VDC, 48 VDC, 125 VDC |
| Input Threshold | 50% of excitation voltage |
| Input Current Limiting | 2.5 mA for channels 1-21; 10 mA for channels 22-24 |
| 24 VDC Supply Current Limit | 0.5 A |
| Signal Conditioning | Input filtering and optical isolation |
| Compatible I/O Packs | STCI and PAIC |
| System Configuration | Simplex |
| Mounting | DIN rail or sheet-metal assembly |
| Wiring | Typically 18 AWG |
| Operating Temp | Not specified in the supplied documentation |
| Dimensions | 159 mm high x 102 mm wide |
| Technology | Surface-mount |
| Origin | United States |
| Manual | GEH-6721 |
| Repair Lead Time | 3-5 days |
Discrete Input Conditioning and Isolation
The IS200STCIH6A receives external contact signals through its terminal connections. Input circuits support three excitation ranges, with a threshold voltage equal to 50% of the applied excitation voltage.
Each input has filtering near the signal entry point to reduce high-frequency interference and limit surge effects. The I/O processor converts the conditioned discrete signals into digital data. Optical isolators provide electrical isolation between the input circuitry and downstream processing.
The first 21 input circuits limit contact current to 2.5 mA. Channels 22 through 24 limit contact current to 10 mA. Resettable polymer positive temperature coefficient fuses limit the 24 VDC supply current to 0.5 A.
Frequently Asked Questions
Q: Which input voltage ranges does the IS200STCIH6A support?
A: The board supports excitation ranges of 16-32 VDC, 32-64 VDC, and 100-145 VDC, corresponding to nominal 24 VDC, 48 VDC, and 125 VDC applications.
Q: How are input signals isolated from the I/O processor?
A: The board filters incoming signals and passes them through optical isolators. The I/O processor then converts the discrete input voltages into digital signals for the controller.
Q: Can the IS200STCIH6A operate in a redundant configuration?
A: The supplied documentation specifies simplex operation. It does not establish support for redundant operation or hot-swapping. Verify the system configuration and replacement procedure against the applicable Mark VIe documentation before installation.
Field Installation Guidelines
- Mount the board on its specified sheet-metal carrier and DIN rail, or secure the assembly to an appropriate cabinet mounting structure.
- Connect external contact circuits to the designated terminal positions according to the applicable wiring diagram.
- Select the input excitation range to match the external circuit voltage.
- Use appropriately rated field wiring. The supplied documentation identifies 18 AWG as a typical conductor size.
- Route signal wiring separately from high-noise power conductors where practical.
- Terminate cable shields at the designated shield bracket. Avoid unintended shield-ground paths.
- Confirm field voltage, polarity, terminal assignments, and protective grounding before energizing the circuit.
- Verify compatibility with the installed STCI or PAIC I/O pack and the simplex system configuration.
- Consult manual GEH-6721 for board-specific wiring, mounting, and commissioning procedures.
