CHAPTER2 Ethernet Unit
!CAUTION
When connecting the controller on an already existing network, always check with the network supervisor before making IP address, subnet mask and gateway set- tings.
M E M O
The IP address is separated into network address and host address sections. The network address section is extracted from the IP address by AND processing with the subnet mask. The remaining portion is the host address section. Devices belonging to the same network must all be set to have the same network address. The host address, however, should be different for every device and set so that no two devices have the same number. The first and the last host address numbers are reserved for the system so be sure not to set these as the IP address.
When the IP address for example is 192.168.0.10 and the subnet mask is 255.255.255.0, the network address section is found to be 192.168.0 and the host address section to be 10 by means of AND processing with the subnet mask. In this case, the network address section of all other devices belonging to that network must all be 192.168.0. The host address section of those other devices on the other hand, must be set to a number other than 10. The number 0 and 255 are reserved, so do not use them for setting the host address.
So when a device having an IP address of 192.168.0.10 and a subnet mask of 255.255.255.0 belongs to a particular network and you want to add another device to that network, then you would assign IP addresses from among 192.168.0.1 to 192.168.0.9 and 192.168.0.11 to 192.168.0.254.
M E M O
The Ethernet unit is not usable with IP address
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