Siemens S7-1200 - Locating the Ethernet (MAC) Address on the CPU

Device configuration
5.7 Configuring the CPU for communication
S7-1200 Programmable controller
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Using the "Extended download to device" dialog to test for connected network devices
The S7-1200 CPU "Download to device" function and its "Extended download to device"
dialog can show all accessible network devices and whether or not unique IP addresses
have been assigned to all devices. To display all accessible and available devices with their
assigned MAC or IP addresses, check the "Show all accessible devices" checkbox.
If the required network device is not in this list, communications to that device have been
interrupted for some reason. The device and network must be investigated for hardware
and/or configuration errors.
5.7.6
Locating the Ethernet (MAC) address on the CPU
In PROFINET networking, a Media Access Control address (MAC address) is an identifier
assigned to the network interface by the manufacturer for identification. A MAC address
usually encodes the manufacturer's registered identification number.
The standard (IEEE 802.3) format for printing MAC addresses in human-friendly form is six
groups of two hexadecimal digits, separated by hyphens (-) or colons (:), in transmission
order, (for example, 01-23-45-67-89-ab or 01:23:45:67:89:ab).
Note
Each CPU is loaded at the factory with a permanent, unique MAC address.
You cannot
change the MAC address of a CPU.