The ESX.3cs is a compact, robust and efficient control unit. In addition to the ESX.3cm, an ESX.3cs (c = compact, s = small) rounds off the third generation of ESX control units. The “c” stands for “compact” and indicates that all pins are fixed assigned prior to the hardware definition. The functions of these pins can be defined in more detail using software. Both control units are also suitable for safety-oriented applications up to Performance Level PL d or Safety Integrity Level SIL 2, and are based on a common architectural concept: The robust aluminum die cast housing with automotive plug-in connectors contains a fast 32-bit microcontroller with four MB Flash and eight MB SRAM, up to two CAN interfaces, one serial interface, Ethernet, LIN and two LEDs.