Device configuration
5.7 Configuring the CPU for communication
S7-1200 Programmable controller
156 System Manual, 03/2014, A5E02486680-AG
If your programming device is using an Ethernet-to-USB adapter card connected to an
isolated network, the IP Address Network ID and subnet mask of your CPU and the
programming device's Ethernet-to-USB adapter card must be exactly the same. The Network
ID is the first part of the IP address (first three octets) (for example,
.16) that
determines what IP network you are on. The subnet mask normally has a value of
. The subnet mask, when combined with the device IP address in a
mathematical AND operation, defines the boundaries of an IP subnet.
-to-USB adapter card is useful when you do not want your programming device
on your company LAN. During initial testing or
commissioning tests, this arrangement is
Table 5- 8 Assigning Ethernet addresses
Programming Device
Adapter Card
Internet Protocol (IP) Address
On-board adapter
card
Connected to
your plant LAN
(and possibly
the world-wide
web)
Network ID of your CPU and the
programming device's on-board
adapter card must be exactly the
same.
1
The subnet mask of your CPU and the
on-board adapter card must be exactly
the same.
The subnet mask normally has a value of
; however, since your
computer is on a plant LAN, the subnet
mask may have various values (for
example,
) in order to set
2
Ethernet-to-USB
adapter card
Connected to an
isolated network
Network ID of your CPU and the
programming device's Ethernet-to-
USB adapter card must be exactly
the same.
1
The subnet mask of your CPU and the
Ethernet-to-USB adapter card must be
exactly the same.
The subnet mask normally has a value of
2
The Network ID is the first part of the IP address (first three octets) (for example,
.16) that determines what
IP network you are on.)
The subnet mask, when combined with the device IP address in a mathematical AND operation, defines the boundaries
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