The Siemens 6ES7864-0AC01-0YX0 is SIMATIC S7 Easy Motion CTRL 2.1, a motion control software package. It comes with a single license for one installation, including software and documentation on CD. The software is available in two languages (German and English) and is executable on STEP 7 V5.3 SP2 or higher. It is designed for SIMATIC S7-300, S7-400, and WinAC reference hardware.