GE IS200 Series Modules: IS200HSLAH2A

Technical Dossier

Product Details And Specifications

GE IS200 Series Technical Notes

The GE IS200 series represents the core I/O, communication, and control module family deployed within GE's Mark VI and Mark VIe Turbine Control Systems. These systems are installed across critical heavy-industry infrastructure worldwide — including gas turbine power plants, combined-cycle facilities, nuclear auxiliary systems, offshore oil and gas platforms, and petrochemical refineries. The IS200 platform has accumulated decades of field deployment, making it one of the most widely referenced DCS module families in the global spare parts market. The IS200HSLAH2A specifically functions as a High-Speed Serial Link (HS SRL LNK) Interface PC Board, responsible for managing high-speed serial communication between the Mark VI controller backbone and peripheral I/O racks or remote terminal units.

The Evolution of IS200 Architecture

The IS200 module family was introduced alongside GE's Mark VI turbine control platform in the mid-1990s as a successor to the Mark V system. The Mark VI architecture introduced a distributed I/O topology using the IONet (I/O Network) — a proprietary deterministic Ethernet-based bus — replacing the older serial backplane of the Mark V. IS200 modules were designed to operate within this IONet framework, with each module assigned a specific functional role: analog input, digital output, power conditioning, communication bridging, or processor control.

With the introduction of the Mark VIe platform in the mid-2000s, GE extended the IS200 family to support dual-redundant IONet configurations and enhanced diagnostics. Many IS200 modules are cross-compatible between Mark VI and Mark VIe racks, though firmware revisions and hardware letter suffixes (e.g., H2A, H1B) indicate generation-specific compatibility constraints. As of 2026, the Mark VI platform has entered its end-of-active-production phase, with GE Vernova (the successor entity post-GE industrial spin-off) continuing to offer limited new-manufacture support. The majority of IS200 procurement now occurs through certified aftermarket channels for lifecycle extension and maintenance-in-place strategies.

IS200 Full Catalog & Functionalities (SKU List)

The following IS200 series modules are categorized by functional role. Each entry reflects a verified, commonly deployed part number within Mark VI / Mark VIe installations:

High-Speed Communication & Serial Link Modules

• IS200HSLAH2A: PC Board, High-Speed Serial Link Interface — manages HS serial communication between controller and I/O racks.
• IS200HSLAH1A: Earlier hardware revision of the HS SRL LNK Interface; functionally equivalent, firmware-dependent compatibility.
• IS200HSLAH1B: Intermediate revision with updated FPGA logic for improved fault detection on serial link channels.

Analog Input Modules (AI)

• IS200AAIAH1A: Analog Input module, 16-channel, 4–20 mA / 0–10 V configurable, used for process variable acquisition.
• IS200AAIAH1B: Revised analog input board with enhanced EMI shielding for high-noise industrial environments.
• IS200ATAIH1A: Thermocouple Analog Input module, supports J, K, T, E, R, S, B type thermocouples for turbine exhaust temperature monitoring.
• IS200ATAIH2A: Second-generation thermocouple input board with expanded cold-junction compensation range.

Digital Input Modules (DI)

• IS200DAIAH1A: Digital Input module, 24 VDC discrete inputs, used for valve position feedback and limit switch monitoring.
• IS200DAIAH1B: Updated DI board with optical isolation improvements for high-voltage field wiring environments.
• IS200DSPXH1A: Digital Signal Processor board, handles real-time discrete logic execution within the Mark VI I/O rack.

Digital Output Modules (DO)

• IS200EDOAH1A: Enhanced Digital Output module, relay-driven outputs for solenoid valve and actuator control.
• IS200EDOAH1B: Revised DO board with increased output current rating per channel.

Power Supply & Conditioning Modules

• IS200EPSMH1A: Power Supply module for Mark VI I/O racks, provides regulated 28 VDC and 5 VDC rails to backplane.
• IS200EPSMH2A: Second-generation power supply with improved thermal management and over-voltage protection circuitry.
• IS200PSCDH1A: DC Power Conditioning board, filters and distributes incoming plant DC power to IS200 rack assemblies.

Processor & Controller Modules (CPU)

• IS200VCMIH2C: VME Controller Module Interface, primary CPU interface board for Mark VI controller chassis.
• IS200TRLYH1A: Triple Redundancy Logic board, supports TMR (Triple Modular Redundancy) voting architecture in safety-critical turbine applications.

Communication Adapter Modules

• IS200BICLH2A: Backplane Interface and Communication Link board, bridges IONet traffic between controller and distributed I/O panels.
• IS200ECTBH1A: Ethernet Communication Terminal Board, provides 10/100 Mbps IONet connectivity for Mark VIe rack integration.

Sourcing Hard-to-Find & Obsolete IS200 Parts

For operators committed to maintenance-in-place strategies — particularly in facilities where a full Mark VIe migration is not economically viable within the current asset lifecycle — DriveKNMS provides: verified pull-from-service units with full traceability documentation, cross-reference matching between obsolete and current-revision part numbers, and emergency dispatch capability for unplanned outage scenarios. All IS200 modules sourced through DriveKNMS are individually tested against OEM functional specifications prior to shipment.

Quality Control for the IS200 Range

IS200 series modules present specific test challenges due to their integration with GE's proprietary IONet communication protocol and VME-based backplane architecture. Standard bench testing is insufficient to validate serial link integrity, backplane bus arbitration, or FPGA firmware state. DriveKNMS applies a structured test protocol for IS200 modules that includes: powered backplane insertion testing within a live Mark VI rack environment, IONet communication verification using GE Toolbox-compatible diagnostic software, channel-level functional verification for all I/O points (analog accuracy, digital switching, relay contact resistance), and thermal soak testing at rated operating temperature to identify latent component failures. The IS200HSLAH2A specifically undergoes serial link loopback testing to confirm HS SRL channel integrity before release.