Lifecycle reality for a critical spare
The 6ES7388-4BN00-0AC0: This CPU388-4 Zentralbaugruppe is a central processing unit for Siemens S7-300 rack-based control systems, commonly deployed in legacy automation lines where a spare in the cabinet means the difference between a planned swap and an unplanned outage.
What the EOL Hot stage means for your BOM
For a CPU module that backs up a running S7-300 line, the procurement decision is straightforward: buy the spare now if the line must stay running, because once the surplus dries up, the only option is a system migration to a current-generation platform.