GE IS420UCSBH4A Controller A GE Mark VIe controller for industrial control applications, including compatible turbine-control systems. PART NUMBER IS420UCSBH4A Controller Mark VIe Industrial Automation System Background GE Mark VIe Control Platform Mark VIe is a modular industrial control platform that combines controllers, Ethernet communications, distributed I/O and control software. The IS420UCSBH4A is identified for use as a Mark VIe, EX2100e or LS2100e controller. System