Communication
8.4 Ethernet
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
413
The IP address of a CPU is not associated with a STEP 7-Micro/WIN SMART project.
Opening a STEP 7-Micro/WIN SMART project does not automatically select an IP address
or establish a connection to a CPU. Every time you create a new or open an existing
STEP 7-Micro/WIN SMART project, you must go to the Communications dialog to establish
a connection to a CPU. The Communications dialog will show the last selected CPU.
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.
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