System manual CECX / Commissioning of CoDeSys and control
Example: Separate network for development PCs and controls.
hub / switch
hub / switch
Gateway
IP addr. 172.25.0.1
subnet m. 255.255.0.0
IP addr. 172.25.10.10
subnet m. 255.255.0.0
gateway 172.25.0.1
IP addr. 172.25.10.11
subnet m. 255.255.0.0
gateway 172.25.0.1
Control network with network address 172.25.x.x, subnet mask 255.255.0.0, gateway 172.25.0.1
Subnet mask
must be taken over by the network (subnet mask from
gateway.
Gateway:
here the address of the gateway nearest the control must be
entered.
7.5.2 Addressing in the Ethernet (basics)
Due to the separation of logic and physical protocol levels (Ethernet and
TCP/IP) two types of addresses exist in the network:
A fixed Ethernet address (MAC-ID) for each unit and
an IP address, which is allocated to each unit in the network.
The application always sends data to or receives data from an IP address.
To ensure their arrival at the receiver a connection must be established be-
tween the logic IP address and the physical Ethernet address. The Address
Resolution Protocol ARP serves this purpose. An ARP table is stored in
each network PC, which specifies the corresponding physical Ethernet ad-
dress for the IP addresses of the network. If the ARP table does not list an
Ethernet address, the IP driver can generally determine it via an ARP re-
quest.
Ethernet address (MAC-ID)
CECX-II 7-10
Содержание CECX-X-C1 Series
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Страница 501: ...The library Ethernet lib The library Ethernet lib ...
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