IFM Electronic ecosys AS-i AC2251 Notice De Montage page 6

Addressing
Assign a free address between 1 and 31. At the factory the address
is set to 0.
Addressing with the addressing unit AC1143 or 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.