Default Addressing - Siemens SIMATIC S7-400 Installation Manual

Default Addressing

Under certain conditions, the CPU can 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 with their default settings (measuring ranges,
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)
Automation System S7-400 Hardware and Installation
A5E00850741-01
Addressing the S7-400
3-3