The Siemens part number 6AV6361-1CA00-0AD0 refers to the Process Historian Redundancy Option for the BSC PCK runtime software. It includes:

A single runtime license

A USB flash drive containing the license key

Designed to enable redundant operation of Process Historian systems

This product was officially discontinued without replacement as of October 1, 2024.

If you're planning a system upgrade or need redundancy in a modern historian setup, I can help you explore Siemens’ current offerings or alternative solutions that align with your infrastructure.