GE IS200STCIH4A Discrete Input Terminal Board

Overview

The GE IS200STCIH4A is a Discrete Input Terminal Board used within GE Mark VI and Mark VIe turbine control systems. It serves as the primary interface between field devices (such as limit switches, sensors, and dry contacts) and the control system’s input modules. The board is responsible for receiving and conditioning discrete (on/off) input signals before transmitting them to the system controller for processing.

Built with GE’s industrial-grade design standards, the IS200STCIH4A ensures reliable signal acquisition, noise immunity, and long-term stability in mission-critical applications like turbine, generator, and process control.

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Structure & Composition

The IS200STCIH4A features a rugged printed circuit board (PCB) with clearly labeled terminal points for simple wiring and maintenance.
Key structural components include:

• Input terminals: 24 dedicated channels for discrete signal connection.

• Signal conditioning circuitry: Provides filtering and isolation for stable input readings.

• Protective components: Surge suppression and transient voltage protection for harsh industrial environments.

• Ribbon connectors: Interface with I/O packs (such as IS220PDOAH1A or IS200STCIH2A) for data transfer.

• LED indicators: Optional signal LEDs for quick input status identification.

The board’s layout facilitates easy installation, inspection, and field replacement.

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Main Features

• 24 Discrete Input Channels: Supports dry contact or voltage-type input signals.

• High Noise Immunity: Built-in filters prevent false triggering in electrically noisy environments.

• Compact Modular Design: Optimized for dense installation within control cabinets.

• Direct Compatibility: Works with GE Mark VI/VIe control system I/O packs.

• Enhanced Protection: Includes transient voltage suppressors for each input line.

• Durable Construction: Engineered for high vibration, temperature, and humidity resistance.

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Technical Parameters 

The IS200STCIH4A operates with a nominal input voltage of 24 V DC, and each input channel draws approximately 7 mA when active. The module provides 24 optically isolated inputs, ensuring electrical separation between the field devices and the system logic.

The board supports a signal detection threshold of 19 V DC (ON) and 5 V DC (OFF), ensuring reliable input state recognition. Power for the board is supplied through the connected I/O pack via the VME backplane or external 28 V DC source. It operates within a temperature range of –30°C to +65°C and can be mounted directly onto the Mark VI/VIe rack system or within local I/O enclosures.

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Applications

The GE IS200STCIH4A is widely deployed in industrial automation systems requiring high-speed discrete input handling, such as:

• Gas and Steam Turbine Control Systems

• Compressor and Pump Control Applications

• Power Plant Automation

• Oil & Gas Processing Facilities

• Industrial Manufacturing Systems

• Marine Propulsion and Energy Management

Its reliability and robust design make it ideal for both new installations and system upgrades where consistent digital input acquisition is critical.

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Installation & Maintenance

Installation:

1. Mount the IS200STCIH4A in its designated position within the I/O rack or enclosure.

2. Connect discrete input field wires to the appropriate terminals as per the GE wiring diagram.

3. Attach the I/O pack (e.g., IS220PDOAH1A) via the ribbon connector.

4. Verify wiring polarity and ground integrity.

5. Power up the system and confirm proper signal detection using LED indicators or software diagnostics.

   
   

Maintenance:

• Periodically inspect terminal connections for looseness or corrosion.

• Clean using antistatic brushes or compressed air.

• Check input signal readings through the Mark VIe diagnostic interface.

• Replace only with identical part numbers to ensure compatibility.

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Additional Information

The GE IS200STCIH4A complies with UL, CE, and IEC industrial control standards. It undergoes rigorous testing for electrical insulation, EMC compliance, and thermal endurance to ensure long-term operational reliability.

Each board is traceable by serial and revision number, enabling easy tracking for maintenance and lifecycle management. The IS200STCIH4A exemplifies GE’s commitment to delivering reliable, high-performance I/O interface solutions for modern turbine and process control applications.