GE IS420UCSCH2A-C | IS420UCSCH2A | Dual Core Mark VIe Controller.IS420UCSCH2A - DUAL CORE MARK VIE CONTROLLER.The GE IS420UCSCH2A Dual Core Mark VIe Controller is a distributed control system (DCS) designed for various applications in thermal, wind, hydro, oil & gas, and nuclear facilities. It is a flexible platform that offers high-speed, networked I/O for simplex, dual, and triple redundant systems.