Locating The Ethernet (Mac) Address On The Cpu - Siemens Simatic S7 Series System Manual

Communication
8.4 Ethernet
8.4.6

Locating the Ethernet (MAC) address on the CPU

In Ethernet 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 (:), 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.
The MAC address is printed on the front, upper-left corner of the CPU. Note that you have to
open the upper door to see the MAC address information.
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MAC address
System Manual, 09/2015, A5E03822230-AC
S7-200 SMART