OPTO 22 SNAP-PAC-R1, Руководство пользователя

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NETWORKING
SNAP PAC R-Series Controller User’s Guide
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NOTE: Make sure you put 3 and 6 on the same pair, or you may experience noise and distance
limitations. Also, make sure to include all pairs, since they are required for 100 Mbps.
Attaching the Controller to an Existing Ethernet Network
The first rule in attaching SNAP PAC R-series controllers to an existing network is to work
closely with your system administrator, who must determine network topology and
hardware. Be sure to consider the impact on your existing network of adding the
controllers.
In addition, make sure the system administrator understands that each controller must have
a
fixed (static) IP address, whether or not a Dynamic Host Configuration Protocol (DHCP)
server is used on the network. For more information on IP addresses, see the PAC Manager
User’s Guide .
If you are using SNAP PAC R-series controllers for data acquisition, you can place the
controller anywhere on an existing Ethernet network. If you are using the controller with
control applications, however, the network segment design will depend on the number of
hosts, the number of data transactions, and issues of data security. With fewer hosts and
fewer data transactions, data packet collisions are less likely and system performance
improves. If collisions are a problem, and especially if you need high throughput and
predictable response times, it’s best to put the controller on a separate switched network
segment. We recommend switches, not hubs. For best performance, use a 100 Mbps
network.