GE IS420UCPAH2A I/O Controller Module 330mm x 200mm Mark VIe

The GE IS420UCPAH2A is a Controller Program with Integral I/Os, the second such model in GE’s Mark VIe Turbine Control System Series. Tailored for gas, steam, and wind turbine control, the Mark VIe Series is highly valued in industrial automation as one of GE’s final Mark lines to integrate patented Speedtronic technology—first introduced with the 1960s Mark I. 

Physically, the controller is a single-module assembly mounted directly on a sheet metal panel, composed of three core components: the IS400BPPCH2A Processor Board, IS400STWCH1A Input/Output Board, and IS400WEXPH1A I/O Expansion Board. The IS400WEXPH1A is key to its expanded I/O functionality, distinguishing it from earlier UCPA controllers. It operates on a 12V DC nominal power supply with Class II protection and requires input terminal wiring no longer than 98 feet. For operation guidance, all necessary details are found in the GEI-10071 Mark VIe Controller UCPA Instruction Guide.

The module includes diagnostic LEDs: DIO1-8 and Pulse 1/2 LEDs and an ATTN LED. These LEDs enable real-time monitoring of the controller’s performance, supporting quick troubleshooting.

Key Features
Expanded I/O Capabilities: Equipped with the IS400WEXPH1A Expansion Board, it adds 4 DIOs, 6 analog inputs, and 2 analog outputs—surpassing the I/O capacity of earlier UCPA controllers and adapting to more complex turbine control needs.

Speedtronic & Mark VIe Alignment: As part of the Mark VIe Series, it leverages GE’s legacy Speedtronic technology, ensuring reliable performance in mission-critical turbine applications and maintaining compatibility with GE’s industrial control ecosystem.

Modular Composition: Built from three dedicated boards, the single-module design simplifies installation and maintenance, with clear component separation for targeted troubleshooting.

Precise Power & Wiring Specs: Operates on 9–16V DC with Class II protection for electrical safety; input wiring length limited to 98 feet to preserve signal integrity, critical for accurate I/O data transmission.

Diagnostic LED Monitoring: Features dedicated LEDs for DIO/Pulse and ATTN. Flash codes communicate specific statuses, enabling efficient issue identification without complex tools.