Appendix B – Configuring the PC for Ethernet subnetworks
Manual – ECC-DFC field bus controller
INFORMATION
The structure of the ECC-DFC IP addresses is designed such that the final octet
(DDD) of all modules is greater than or equal to 20 and less than or equal to 240.
This means that 36 valid addresses (256 - 220 = 36) are left free in the same
subnetwork for other devices such as PCs and PLC controllers. In our example
the final octet of the PC's IP address has been set to 10. This could also be any
other value from 0 to 19 or 241 to 255. Network conventions stipulate that the
values 0 and 1 of the final octet (DDD) of a subnetwork are normally reserved for
the standard gateway, often the address of an Ethernet router.
Also note that in our example, all possible subnetworks for the subnet mask that
is shown (255.255.252.0) are used. From figure 44 above, every value for X in
the diagram would have to be able to be selected that is listed above the value
252. In this case, simply more subnetworks would have been available for ad-
dressing.
10.2.1. Changing the IP address of the PC
To change the IP address of the PC, click
Start – Control panel – Network Connec-
tions – Local Area Network. The “Local
Area Connection Status” window is then
displayed. Click Properties in this win-
dow.
The “Local Area Connection Properties”
window is displayed. Scroll down in the
selection window and click once to select
Internet Protocol (TCP/IP). Click the
Properties button.
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