Addressing the S7 -400
3-3
Automation System S7-400 Hardware and Installation
A5E00850741-01
Default Addressing
Under certain conditions, the CPU c an handle the assignment between logical
address and geographical address for you (default addressing). The logical
addresses are then permanently assigned to the slots (default address). Distributed
I/Os are not taken into account.
Conditions for Default Addressing
The CPU assigns default addresses under the following conditions:
• No multicomputing
• If only signal modules are inserted
(no IM, CP, FM inserted; no expansion racks connected)
• If signal modules are used w ith their default settings (measuring r anges,
interrupt processing, etc.)
• If modules are inserted in STOP mode or during power off
(modules inserted while the system is in RUN or during a RUN → STOP →
RUN transition will be ignored)
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