IFM Electronic AS interface AC2251 Montageanleitung Seite 6

Addressing
Assign a free address between 1 and 31. At the factory the address is
set to 0.
Addressing with the addressing unit AC1144
When mounted and wired the module can be addressed by connec-
ting the addressing cable (E70213) to the implemented addressing
socket.
Do not remove the addressing plug while live.
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