Description
Product Overview
The IS200ESYSH2A is an EX2100e System I/O Dual board designed for GE excitation control systems. It provides the interface between customer field signals and the EX2100e control system, handling a range of analog inputs, analog outputs, relay contacts, auxiliary contact inputs, and protection-related signals. The H2 version uses a dual-control arrangement with M1 and M2 control sections, making it suitable for systems requiring redundant control paths. The board communicates with the EX2100e control system through a high-speed serial link daughterboard, while removable terminal strips simplify field wiring service. It can be used in both regulator and static excitation applications.
Technical Specifications — IS200ESYSH2A
| Parameter | Value |
|---|---|
| Product Model | IS200ESYSH2A |
| Manufacturer | General Electric (GE) |
| Product Type | EX2100e System I/O Dual Board |
| Series | EX2100e Excitation Control |
| Functional Acronym | ESYS |
| Control Architecture | Dual |
| Control Sections | M1 and M2 |
| Analog Inputs | 4–20 mA / ±10 V |
| Analog Outputs | Four 12-bit analog outputs |
| Relay Outputs | 4 Form-C contact outputs |
| Auxiliary Inputs | 7 contact inputs |
| Power Supply | 28 VDC |
| Communication | High-speed serial link |
| Terminal Interface | Removable screw terminal strips |
| Mounting | EX2100e control cabinet |
| Typical Application | Regulator and static excitation systems |
| Compliance | Refer to applicable GE EX2100e documentation |
The available technical documentation identifies the board as a dual-control ESYS interface with four 12-bit analog outputs, four Form-C relay outputs, seven auxiliary contact inputs, and customer analog I/O capability.

GE IS200ESYSH2A
Key Features and Benefits — IS200ESYSH2A
- Dual M1/M2 control-section architecture.
- Interfaces customer I/O with the EX2100e excitation controller.
- Supports analog input and output signals.
- Provides Form-C relay contact outputs.
- Includes auxiliary contact inputs for excitation-system monitoring.
- Uses removable terminal strips for field wiring maintenance.
- Suitable for both regulator and static excitation configurations.
- Supports trip-related relay functions used by excitation protection circuits.
One practical point matters during replacement: this is a system-interface board, not simply a generic analog I/O card. The associated high-speed serial interface and control architecture must be checked before substitution.
Related Models
IS200ESYSH1A: EX2100e System I/O board configured for TMR architecture and used where triple-modular redundancy is required.
IS200ESYSH3A: EX2100e System I/O board configured for simplex control applications.
IS200EMIOH1A: EX2100 main I/O board providing additional interface functions within the excitation control system.
IS200HSLAH2A: High-speed serial link interface hardware associated with EX2100e control-system communications.

GE IS200ESYSH2A
Installation and Maintenance — IS200ESYSH2A
Before replacement, confirm the EX2100e system architecture, M1/M2 controller arrangement, terminal wiring, analog signal ranges, relay assignments, and high-speed serial interface. Photographing terminal positions before removal is worthwhile, particularly when several field circuits share the same terminal assembly.
During maintenance, inspect removable terminal strips, board connectors, mounting hardware, and signs of overheating or contamination. Verify the 28 VDC supply and communication path before assuming the board itself has failed. After installation, perform the applicable I/O loop checks and confirm controller diagnostics before returning the excitation system to service.
Personally, I would verify the HSSL interface and M1/M2 configuration first when troubleshooting this assembly. A communication or configuration problem can produce symptoms that resemble an I/O board failure.
Product Warranty — IS200ESYSH2A
Warranty coverage should be confirmed with the supplier based on the actual supplied condition, such as new, unused surplus, refurbished, or repaired. For critical excitation-control spares, procurement records should include the complete part number, revision information, serial number where available, inspection status, and warranty period.
When sourcing the GE IS200ESYSH2A, verify the dual-control configuration and associated EX2100e hardware before purchase to avoid an incompatible replacement.
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