Technical data

Manual VIPA System 300S SPEED7 Chapter 4 Deployment
HB140E - CP - RE_343-1EX71 - Rev. 09/46 4-11
Basics - IP address and subnet
Industrial Ethernet exclusively supports IPv4. At IPv4 the IP address is a
32Bit address that must be unique within the network and consists of 4
numbers that are separated by a dot.
Every IP address is a combination of a Net-ID and a Host-ID and its
structure is as follows:
xxx.xxx.xxx.xxx
Range: 000.000.000.000 to 255.255.255.255
The network administrator also defines IP addresses.
The Network-ID identifies a network res. a network controller that
administrates the network.
The Host-ID marks the network connections of a participant (host) to this
network.
The Host-ID can be further divided into a Subnet-ID and a new Host-ID by
using a bit for bit AND assignment with the Subnet mask.
The area of the original Host-ID that is overwritten by 1 of the Subnet mask
becomes the Subnet-ID, the rest is the new Host-ID.
Subnet mask binary all "1" binary all "0"
IPv4 address Net-ID Host-ID
Subnet mask and IPv4 address Net-ID Subnet-ID new Host-ID
A TCP-based communication via point-to-point, hub or switch connection is
only possible between stations with identical Network-ID and Subnet-ID!
Different area must be connected with a router.
The subnet mask allows you to sort the resources following your needs.
This means e.g. that every department gets an own subnet and thus does
not interfere another department.
At the first start-up the Ethernet CP 343S-NET - SPEED-Bus does not
have an IP address. The are following possibilities for address assignment:
The assignment takes place with the following directly via the hardware
configuration.
• Set the PG/PC interface of the Siemens SIMATIC manager to
"TCP/IP...RFC1006" and search and assign address by means of
"Assign Ethernet Address". After the assignment the IP parameters are
set immediately without CPU restart.
• At the first start-up you may assign an IP address and a subnet mask to
your CP by means of a "minimum project" and transfer this via MMC or
MPI into the CPU. After a reboot of the CPU and after switching the
PG/PC interface to "TCP/IP... RFC1006" you may now configure your
CPU online via the CP.
IP address
structure
Net-ID
Host-ID
Subnet mask
Subnet
Address at first
start-up