GE IS2020 Modules IS2020RKPSG1AK Rack Power Supply

Technical Dossier

Product Details And Specifications

GE IS2020 Series Technical Notes

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.

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: