Siemens SIMATIC S7-1200 System Manual page 821

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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.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Communication

11.2 PROFINET

Use the CPU "Download to de-

vice" function and the "Extended

download to device" dialog to

show all accessible network de-

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

all-important in identifying devices

that are missing the required

unique IP address.