Patent ID: 6871240

Claim:
In a safe control system comprising a field bus, an administration unit and a plurality of field bus users, all of which being connected to said field bus, a method of allocating a defined user address to a selected bus user when connecting the same to said field bus, said method comprising the steps of: activating a special maintenance mode in said administration unit, repeatedly sending out a defined maintenance message from said administration unit to said plurality of bus users, connecting said selected bus user to said field bus, receiving said defined maintenance message by said selected bus user, sending out a first registration message from said selected bus user to said administration unit, said first registration message containing a predetermined universal address, sending out an address allocation message from said administration unit to said selected bus user, said address allocation message containing said defined user address to be allocated, receiving said address allocation message by said selected bus user, and storing said defined user address in a memory of said selected bus user.