SAFE data types and function blocks - How do they work and are they only for use with safety modules/controllers?

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Hi all,

I'm struggling to find any information on this.

What are the SAFE data types and functions blocks specifically used for and can you use a mix of safe and non-safe variables together depending on functionality?

I'm assuming the data/FBs are reserved for use on the safety PLC controllers and modules, but what specifically about the safe data type and FBs make then 'safe'?

We can have persistent variables on the PLC already, so how do these differ from safe equivalent variables?

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