GE IS230SNRLH2A IS200SRLYH2AAA Modules

Technical Dossier

Product Details And Specifications

GE IS200 / IS230 Series: Comprehensive Module Range and Technical Overview

The GE IS200 and IS230 module families form the hardware backbone of the Mark VIe Distributed Control System (DCS), one of the most widely deployed turbine and process control platforms in global heavy industry. Installations span combined-cycle power plants, nuclear generating stations, petroleum refineries, LNG terminals, and large-scale chemical processing facilities across North America, Europe, the Middle East, and Asia-Pacific. The IS230SNRLH2A and IS200SRLYH2AAA are discrete output (relay) modules within this ecosystem, responsible for driving high-side and low-side switching loads including solenoid valves, motor starters, and protective relay coils. Their role in safety-critical switching makes them among the most frequently replaced components during scheduled outages and corrective maintenance events.

The Evolution of IS200 / IS230 Architecture

GE's Mark series turbine control architecture progressed through Mark I through Mark VI before the introduction of the Mark VIe platform in the early 2000s. The Mark VIe represented a fundamental shift from proprietary backplane communication to an Ethernet-based IONet topology, enabling distributed I/O across multiple cabinets and remote terminal units. The IS200 and IS230 module families were developed specifically for this architecture.

Early IS200-series boards used through-hole component construction and operated on a single-redundant IONet segment. Subsequent hardware revisions (denoted by the trailing letter suffix, e.g., H1A → H2A → H2B) introduced surface-mount components, improved EMI shielding, enhanced conformal coating for humid environments, and revised firmware compatibility with later Mark VIe controller revisions (IS215VCMIH2A, IS215UCVEH2A). The IS230 sub-family introduced a form-factor change with a taller board profile to accommodate additional relay contact rows and higher channel density.

As of 2026, the majority of IS200/IS230 hardware revisions are in the mature-to-end-of-life phase of their product lifecycle. GE (now part of GE Vernova) has transitioned new projects toward the Mark VIeS and Mark VIeS Safety platforms. However, the installed base of Mark VIe systems running IS200/IS230 I/O remains enormous, and OEM spare parts supply has tightened significantly. Third-party repair and certified-refurbished sourcing has become the primary procurement channel for maintenance teams operating these systems beyond their original design life.

IS200 / IS230 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the IS200 and IS230 families. Each entry reflects the module's primary functional classification within the Mark VIe I/O architecture.

Discrete Output Modules

• IS230SNRLH2A: 24-channel discrete relay output module; SNRL board assembly for Mark VIe cabinets.
• IS200SRLYH2AAA: Relay output terminal board; mates with SNRL to provide field-side relay contact termination.
• IS200SRTDH1A: Discrete output terminal board, RTD-compatible variant for thermocouple/resistance input switching circuits.
• IS230SNRLY1A: Earlier hardware revision of the SNRL discrete relay output board; single IONet segment.

Discrete Input Modules

• IS200SDCIH2A: 24-channel discrete contact input module; reads dry-contact and wet-contact field signals.
• IS230SDCIH2A: IS230-form-factor discrete contact input board; higher channel density variant.
• IS200STCIH2A: Thermocouple input terminal board for discrete temperature signal acquisition.

Analog Input / Output Modules

• IS200SAICH2A: 16-channel analog input module; 4–20 mA and 0–10 V field signal acquisition.
• IS200SAOCH1A: 8-channel analog output module; 4–20 mA current loop drive for control valves and positioners.
• IS230SAIAH1A: IS230-form-factor analog input board; used in high-density I/O enclosures.

CPU / Controller Modules

• IS215VCMIH2A: Mark VIe VME controller module; primary CPU for turbine control sequencing and protection logic.
• IS215UCVEH2A: Alternate Mark VIe controller variant; used in simplex and TMR configurations.
• IS200EACAH1A: Ethernet adapter/communication board for IONet segment bridging.

Power Supply Modules

• IS200EPSMH1A: Mark VIe I/O power supply module; 24 VDC regulated output for I/O bus.
• IS200EPSMH2A: Revised power supply module with improved hold-up capacitance and over-voltage protection.

Communication / Network Modules

• IS200EACAH2A: Dual-port IONet Ethernet adapter; supports redundant network topologies.
• IS200EMIOH1A: Modbus/PROFIBUS gateway module for legacy field device integration.

Sourcing Hard-to-Find & Obsolete IS200 / IS230 Parts

DriveKNMS maintains a dedicated inventory program for IS200 and IS230 series modules, with particular focus on hardware revisions that GE has discontinued from active production. For operators running Mark VIe systems under long-term service agreements or self-maintained under an in-house engineering model, the ability to source specific board revisions — rather than accepting cross-revision substitutions — is operationally critical. Firmware compatibility between controller revisions and I/O board hardware revisions is not always backward-compatible, and substituting an H2B board into a system configured for H2A can trigger diagnostic faults or require a controller software update.

DriveKNMS sources IS200/IS230 modules through a combination of decommissioned plant asset recovery, authorized distributor overstock, and certified repair of field-returned units. All units are catalogued by part number, hardware revision suffix, and firmware version where applicable. Customers requiring a specific revision for compatibility reasons are encouraged to specify the full part number including suffix when submitting an inquiry.

Quality Control for the IS200 / IS230 Range

IS200 and IS230 modules present specific test challenges due to their integrated backplane communication logic and relay contact arrays. DriveKNMS applies the following test protocol to all units prior to dispatch:

• IONet Communication Verification: Each board is installed in a live Mark VIe test rack and polled via IONet to confirm correct device enumeration, firmware version reporting, and absence of diagnostic fault codes.
• Relay Contact Functional Test: For discrete output modules (SNRL, SRLY), all relay channels are individually energized and de-energized. Contact resistance is measured at both NO and NC positions. Coil drive current is verified against OEM specification.
• Analog Channel Calibration Check: For SAIC and SAOC modules, each channel is stimulated with a calibrated signal source and output is verified against the module's engineering unit conversion table.
• Visual and Physical Inspection: Conformal coating integrity, connector pin condition, capacitor inspection, and board-level component review are performed under magnification.
• Burn-In Cycle: Units are powered continuously for a minimum of 24 hours in a temperature-controlled environment prior to final packaging.