Communication
11.2 PROFINET
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
821
The MAC address is printed on the front, lower-left corner of the CPU. Note that you have to
lift the lower door to see the MAC address information.
Initially, the CPU has no IP address, only a factory-installed MAC address. PROFINET
communications requires that all devices be assigned a unique IP address.
Use the CPU "Download to d
e-
vice" function and the "Extend
ed
download to device" dialog to
show all accessible network d
e-
vices and ensure that unique IP
addresses have been assigned to
all devices. This dialog displays all
accessible and available devices
with their assigned MAC or IP
addresses. MAC addresses are
-important in identifying devices
that are missing the required
unique IP address.
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