QUESTION:

What is the purpose of terminal FE (Functional Earthing) with the 3RK1105 AS-i Safety monitor?

Is it necessary to connect this terminal "FE" to earth (ground) or can one leave it unconnected ?
 

ANSWER:

Functional Earthing "FE" has following meaning:
Earthing of a location in an electrical system or switchboard or equipment which is required for another purpose than for protection against electrical shock

Connecting the protective earth conductor to the terminal "FE" kann remain undone if the terminal M is connected to earth very proximate to the device.