•
Additional nodes or heavier network traffic affects network performance less than the
other topologies
•
Simple installation, expansion, and troubleshooting
Note
Network configuration and programming require careful consideration. Visit
ni.com/info
and enter
fdenet
for information about exploiting link redundancy and
automatically improving reliability.
Disadvantages:
•
Most costly of the recommended topologies
•
Requires an external switch (external 802.1AS switch for network synchronization)
•
Covers the least distance
Note
For information about daisy-chaining power, refer to
Power Connectors and
Wiring
.
Other Topologies
For information about designing Ethernet measurement systems for synchronization, visit
ni.com/info
and enter
fdenet
.
External Switch Requirements
To meet the minimum requirements for successful operation with FieldDAQ devices, any
switch directly connected to the FieldDAQ device should be compliant with
IEEE 802.1Q-1998 bridges and bridged networks.
To take advantage of the network synchronization and network redundancy features of the
FieldDAQ device, ensure that your network infrastructure meets certain requirements:
•
IEEE 802.1AS-2011 time-based synchronization support
—Automatically
synchronizes timebases and enables the use of time-based triggers and multi-device tasks
between device across the network.
•
IEEE 802.1Q-2014 (Rapid Spanning Tree Protocol) support
—Supports network
redundancy functionality in ring and star topologies
–
Rapid Spanning Tree Protocol (RSTP) enabled
–
Bridge Protocol Data Units (BPDU) Guard disabled
To learn more about recommended network switches and other network configuration best
practices and requirements, visit
ni.com/info
and enter
fdenet
.
Connecting to a Real-Time Controller
You can use the FieldDAQ device as expansion I/O from certain NI Linux Real-Time
controllers. Discover and configure the NI Linux Real-Time controller in NI MAX, then
discover and configure the FieldDAQ device.
Note
When using an NI Real-Time controller as the host, you can only use select
controllers with the NI Linux Real-Time operating system that support NI-DAQmx.
Supported NI Linux Real-Time controllers include the IC-317
x
, cRIO-9035/9039
26
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ni.com
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FD-11613 User Guide