GE IS2020 Modules: IS2020RKPSG1AK Rack Power Supply & Full Series

Technical Dossier

Product Details And Specifications

GE IS2020 Series: Comprehensive Module Range and Technical Overview

The GE IS2020 series is a core hardware platform within the GE Mark VIe Distributed Control System (DCS), deployed across global heavy industry sectors including petrochemical refineries, nuclear power stations, offshore platforms, combined-cycle gas turbine plants, and pulp and paper facilities. The IS2020 designation covers a broad family of rack-mounted I/O, power, communication, and controller modules engineered to operate within the Mark VIe TMR (Triple Modular Redundancy) and simplex control architectures. Installed base spans hundreds of facilities across North America, Europe, the Middle East, and Asia-Pacific, making long-term parts availability a critical operational concern for plant maintenance teams.

The Evolution of IS2020 Architecture

The IS2020 series succeeded the earlier Mark V and Mark VI hardware generations. Mark V (IS200 prefix) modules used VME-based backplane architecture with proprietary IONet communication. The transition to Mark VI introduced the IS200 series with Ethernet-based IONet, while Mark VIe expanded to the IS2020 platform with dual Ethernet redundancy (IONET and UDH — Unit Data Highway), supporting both legacy serial I/O and modern Ethernet I/O packs.

The IS2020 backplane uses a high-density connector system incompatible with earlier IS200 boards at the physical level, though software configuration overlap exists via ToolboxST. Facilities running mixed Mark VI / Mark VIe environments must account for firmware version alignment between VCMI, VCRC, and I/O pack firmware. End-of-sale notices for several IS2020 modules were issued between 2018 and 2022, shifting procurement to the aftermarket and authorized repair channel.

IS2020 Full Catalog & Functionalities (SKU List)

Power Supply Modules

• IS2020RKPSG1AK: Rack power supply module, 24VDC regulated output, Mark VIe TMR rack compatible, primary power distribution for I/O rack assemblies.
• IS2020RKPSG1BK: Rack power supply module, variant B revision, updated capacitor specification for extended thermal tolerance.
• IS2020RKPSG2AK: Dual-output rack power supply, supports redundant power feed configurations in high-availability rack builds.

Controller / CPU Modules

• IS2020VCMIH2AK: Mark VIe VME controller module, dual Ethernet ports, primary control processor for simplex and TMR configurations.
• IS2020VCMIH2BK: Revision B VCMI controller, enhanced memory allocation, compatible with ToolboxST R05.02 and later.
• IS2020VCRCG1AK: Redundancy controller module, manages TMR voting logic and cross-channel communication between VCMI boards.

Analog Input Modules

• IS2020AAIAH1AK: 16-channel analog input module, 4–20mA, 12-bit resolution, HART protocol pass-through capable.
• IS2020AAIAH1BK: Revision B analog input, improved common-mode rejection ratio (CMRR), field-proven in thermocouple-dense environments.
• IS2020ATAIH1AK: Thermocouple analog input module, supports J, K, T, E, R, S, B type thermocouples, cold junction compensation onboard.

Analog Output Modules

• IS2020AAOAH1AK: 8-channel analog output, 4–20mA, 12-bit DAC, loop-powered field device compatible.

Digital Input Modules

• IS2020DAIAH1AK: 24-channel digital input module, 24VDC logic level, optically isolated, suitable for proximity switch and limit switch inputs.
• IS2020DAIAH1BK: Revision B digital input, extended input voltage range 18–32VDC, improved noise immunity.

Digital Output Modules

• IS2020DAOAH1AK: 16-channel digital output, 24VDC sourcing, 500mA per channel, short-circuit protected.
• IS2020DAOAH1BK: Revision B digital output, enhanced thermal derating curve for high-ambient installations.

Communication / Network Modules

• IS2020ENEAH1AK: Ethernet network adapter module, dual RJ45, supports IONet and UDH redundant network topologies.
• IS2020STTCH1AK: Serial communication module, RS-232/RS-485 configurable, Modbus RTU master/slave support for legacy field device integration.

Sourcing Hard-to-Find & Obsolete IS2020 Parts

Multiple IS2020 series modules have reached end-of-sale status with GE Vernova (formerly GE Gas Power). For facilities operating Mark VIe systems beyond the original hardware lifecycle — typically 15 to 25 years in power generation and refining applications — aftermarket procurement is the primary supply channel.

DriveKNMS maintains a dedicated inventory of IS2020 series modules sourced from decommissioned plant assets, authorized repair facilities, and OEM surplus channels. All units are subject to pre-shipment inspection. For obsolete or low-availability part numbers, DriveKNMS provides cross-reference analysis to identify compatible substitute modules where direct replacements are unavailable. Lead times for critical spares are communicated at the time of inquiry. Emergency same-day quotation is available for shutdown-critical requirements.

Quality Control for the IS2020 Range

IS2020 modules incorporate high-density VME backplane connectors and proprietary GE bus communication protocols. Standard bench testing procedures are insufficient for validating IS2020 module functionality. DriveKNMS applies a structured test protocol specific to this series:

• Backplane connector inspection: pin alignment, contact plating integrity, and insertion force measurement per GE connector specification.
• Power rail verification: 5VDC, 12VDC, and 24VDC rail output under load, measured against GE IS2020 power budget tables.
• Firmware version audit: EPROM or flash firmware version confirmed against ToolboxST compatibility matrix prior to shipment.
• IONet communication test: module is bench-connected to a Mark VIe test rack and polled via ToolboxST to confirm diagnostic-free enumeration.
• Thermal cycling: modules are subjected to 0°C to 60°C thermal cycle to identify latent capacitor or solder joint failures before shipment.
• Visual inspection: conformal coating integrity, component-level inspection for corrosion, burn marks, or mechanical damage.

Test records are retained per shipment and available upon request for quality-audited procurement programs.