IDEC WindSRV - Manual (Page 123)

122
www.kepware.com
KEPServerEX5 Help
Each device has now been defined under
its own channel. In this new
configuration, a single path of execution
is dedicated to the task of gathering data
from each device. If the application has
fewer devices, it can be optimized
exactly how it is shown here.
The performance will improve even if the
application has more devices than
channels. While 1 device per channel is
ideal, the application will still benefit from
additional channels. Although by
spreading the device load across all
channels will cause the server to move
from device to device again, it can now
do so with far less devices to process on
a single channel.
Important: This same process can be used to make multiple connections to one Ethernet device. Although the OPC
Server may allow 100 channels for most drivers, the device ultimately determines the number of allowed connections.
This constraint comes from the fact that most devices limit the number of supported connections. The more connections
that are made to a device, the less time it will have to process request on each connect. This means that there can be
an inverse tradeoff in performance as connections are added.
How To... Select the Correct Network Cable
Without prior experience of Ethernet enabled devices or Serial to Ethernet converters, users may find selecting the
correct network cable a confusing task. There are generally two ways to determine the proper cable setup. If
connecting to the device or converter through a network hub or switch, users will need Patch Cable. A Patch Cable
gets its name from the days when a telephone operator-style board was used to patch or connect devices to each
other. If connecting directly to the device from the PC, however, users will need a Crossover Cable. Both of these
cables can be purchased from an electronic or PC supply store.
Cable Diagrams