Siemens SCALANCE W788-1PRO Operating Instructions Manual page 64

Subnet Mask input box
The subnet mask specifies the range of addresses within which communication
ca n take place.
The four numbers of an IP address separated by periods are interpreted as a bit
pattern. If a one is set at a bit position within the subnet mask, this means that onl
devices with an IP address the matches the IP address
Management Agent at this bit position can communicate with the
SCALANCE W78x.
Example
Let us assume that the IP address of the SCALANCE W78x is set to
192.168.147.189 and the subnet mask is set to 255.255.255.0. The bit pattern for
255 is 1111 1111. This means that the bit pattern of the first number of the IP
address of a comm
W78x exactly at this point. The same applies to the second and third parts of the IP
address. The IP address of a communication partner must therefore start with
192.168.147. The bit pattern of 0 is 0000 0000. This means that the bit pattern of
the last part of the IP address of the partner device does not need to match the
address of the SCALANCE W78x at any point; in other words, it can be any
number.
Operating Instructions SCALANCE W78x
C79000-G8976-C184-07
Configuration Using the Wizards of Web Based Management
unication partner must match the bit pattern of the SCALANCE
of the SCALANCE W78x
y
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