The IS420UCSBH4A is one of a number of controllers designed by GE for its Mark IVe Speedtronic system. The Mark VIe was the last Speedtronic system released by GE for managing industrial turbine systems. It is one of five UCSB controller modules available.
The IS420UCSBH4A is designed as a single module that connects to external I/O packets using onboard I/O network connectors. In previous versions of Speedtronic control systems, these types of interfaces were implemented via a backplane connector located on the side of the controller.

The IS420UCSBH4A is a controller for GE Mark VIe systems. This was one of the last Speedtronic systems released by GE for managing industrial gas and steam turbines. The IS420UCSBH4A is one of five UCSB controllers available in the Mark VIe system. It is a quad-core controller that delivers high performance and optimal reliability. The unit was built around the QNX Neutrino operating system running on a 1066 MHz Intel EP80579 microprocessor. The system uses Boolean logic control block language in relay ladder diagram format. This format supports Boolean logic as well as 16-bit and 32-bit signed and unsigned integers and 32-bit and 64-bit floating-point programming.

IS420UCSBH4A