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Deployment PG/OP communication - productive
Basics - IP address and subnet
Address at first start-up
Address classes
Private IP networks
Reserved Host-IDs
220
Subnet mask
IPv4 address
Subnet mask and IPv4 address
At the first start-up of the CPU, the Ethernet PG/OP channel does not have an IP
address.
Information about the assignment of IP address data to the Ethernet PG/OP channel may
Ä Chap. 4.7 'Hardware configuration - Ethernet PG/OP channel' page 72.
be found in
For IPv4 addresses there are five address formats (class A to class E) that are all of a
length of 4byte = 32bit.
Class A
0
Network-ID (1+7bit)
Class B
10
Class C
110
Class D
1110
Class E
11110
The classes A, B and C are used for individual addresses, class D for multicast
addresses and class E is reserved for special purposes. The address formats of the 3
classes A, B, C are only differing in the length of Network-ID and Host-ID.
These addresses can be used as net-ID by several organizations without causing con-
flicts, for these IP addresses are neither assigned in the Internet nor are routed in the
Internet. To build up private IP-Networks within the Internet, RFC1597/1918 reserves the
following address areas:
Network class
from IP
A
10.0.0.0
B
172.16.0.0
C
192.168.0.0
(The Host-ID is underlined.)
Some Host-IDs are reserved for special purposes.
Host-ID = "0"
Host-ID = maximum (binary complete "1")
Never choose an IP address with Host-ID=0 or Host-ID=maximum! (e.g.
for class B with subnet mask = 255.255.0.0, the "172.16.0.0" is reserved
and the "172.16.255.255" is occupied as local broadcast address for this
network.)
binary all "1"
Net-ID
Net-ID
Network-ID (2+14bit)
Network-ID (3+21bit)
Multicast group
Reserved
to IP
10.255.255.255
172.31.255.255
192.168.255.255
Identifier of this network, reserved!
Broadcast address of this network
HB300 | CPU | 013-CCF0R00 | en | 19-30
VIPA System SLIO
binary all "0"
Host-ID
Subnet-ID
new Host-ID
Host-ID (24bit)
Host-ID (16bit)
Host-ID (8bit)
Standard subnet
mask
255.0.0.0
255.255.0.0
255.255.255.0
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