Parameterization and commissioning
4.2.2 Setting the address via DHCP server
Port 1 (X001) is set to DHCP by default.
Port 2 (X101 and X102) is to be configured by DIP switch (see DIP switch)
If DHCP is switched on, the CX is automatically assigned an IP address by the DHCP server. The DHCP
server must know the MAC ID of the Bus Terminal Controller for this. The IP address should be assigned
statically by the DHCP server. A local IP address is used if no DHCP server is reachable.
The DNS name is formed from the type and the last 3 byte of the MAC ID. The MAC ID is given on the
production label of the Bus Terminal Controller.
CX8090 example
• MAC ID: 00-01-05-01-02-03
• DNS name: CX-010203
4.2.3 Subnet mask
The subnet mask is subject to the control of the network administrator, and specifies the structure of the
subnet.
Small networks without a router do not require a subnet mask. The same is true if you do not use registered
IP numbers. A subnet mask can be used to subdivide the network with the aid of the mask instead of using a
large number of network numbers.
The subnet mask is a 32-bit number:
• Ones in the mask indicate the subnet part of an address space.
• Zeros indicate that part of the address space which is available for the host IDs.
Description Binary representation Decimal representation
IP address 10101100.00010000.00010001.11001000 172.16.17.200
Subnet mask 11111111.11111111.00010100.00000000 255.255.20.0
Network ID 10101100.00010000.00010000.00000000 172.16.16.0
Host ID 00000000.00000000.00000001.11001000 0.0.1.200
Standard subnet mask
Address class Standard subnet mask (decimal) Standard subnet mask (hex)
A 255.0.0.0 FF.00.00.00
B 255.255.0.0 FF.FF.00.00
C 255.255.255.0 FF.FF.FF.00
Note
Assignment of subnets, host numbers and IP addresses
Neither subnet 0 nor the subnet consisting only of ones may be used. Host number 0, and
the host number consisting only of ones, must not be used. Under BootP or DHCP the sub-
net mask is transmitted also by the server.
CX808022 Version: 1.0.0
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