What is the CPU Emergency Address and when is it used?

What is the CPU Emergency Address and when is it enabled / disabled?

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This is this address: w#16#5968#5858
It is accessed through an Ethernet interface. Used only in these cases:

Download STEP 7 project with fixed address
If the CPU is in STOP mode, you can use a tool that allows you to temporarily assign an IP address to the CPU.

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