Resolving known issues with PID loops, motion control, or communication blocks.
Never turn off or reboot the PLC while the firmware update is actively processing. Consider connecting the PLC to an Uninterruptible Power Supply (UPS).
Official firmware for the S7-1500 family is hosted exclusively on the Siemens Industry Online Support (SIOS) Search by Article Number : Use your CPU’s specific MLFB (e.g., 6ES7511-1AK02-0AB0 ) in the SIOS search bar to find the exact download page. Registration Required : You must have a registered Siemens Account to download export-restricted software like firmware. Latest Releases
As of late 2025, Siemens has been rolling out Firmware V3.1 and V4.0 for newer S7-1500 models (specifically the G2 series). These updates allow for: