Complete the following steps to implement the Static Structural Test Reference Architecture design pattern for your specific test needs.
Map your sensor list to the supported C series modules in the following table.
|Quarter Bridge Strain||NI-9235||8-Channel, 10 kS/s/channel, 120 Ω Quarter-Bridge Strain Gage, C Series Strain/Bridge Input Module|
|NI-9236||8-Channel, 10 kS/s/channel, 350 Ω Quarter-Bridge Strain Gage, C Series Strain/Bridge Input Module|
|Thermocouple||NI-9213||16-Channel, 75 S/s Aggregate, ±78 mV C Series Temperature Input Module|
|Voltage||NI-9215||4-Channel, ±10 V, 100 kS/s/ch, 16-Bit, Simultaneous Input, C Series Voltage Input Module|
Arrange your nodes into rings, as shown in the following figure.
The maximum number of nodes per ring is dependent on the amount of cRIO-9805 Ethernet switches needed to aggregate the system. The maximum ring sizes are also based on the total number of nodes in the system. Design your rings within the limits in the following table.
|Total Nodes||Maximum Nodes per Ring|
The maximum amount of nodes per ring reduces as total nodes in the system increase to account for the allowable amount of network hops in the TSN network. Refer to Figure 4 for more information.
Aggregate the list of rings to a single port.
The cRIO-9805 Ethernet switch can aggregate communication on up to three out of its four Ethernet ports. When arranging the cRIO-9805 devices, the two ports coming off of a ring must be connected to the same switch.
Divide your ring list into pairs and aggregate each pair together according to the pattern in the following figure.
An additional cRIO-9805 can aggregate up to three ring pairs, as shown in the following figure. Use this recursive pattern to group rings until all ring communication aggregates to a single network port.
You can adjust the ring sizes in your design so long as no two nodes are more than 15 hops apart.
The TSN network can tolerate a maximum number of 15 hops between any two nodes in the network. When a cable or node fails within a ring, the remaining nodes in the ring reconfigure into two daisy chains. In a worst case scenario, a ring of N nodes could reconfigure into a daisy chain of N nodes.
Select the power supplies for your nodes and the network aggregation subsystem. Each CompactDAQ chassis and Ethernet switch in your system needs its own DC power connection.
Instead of using the dedicated power supply that ships with these components, you can consolidate AC power conversion into larger power supplies that distribute their DC outputs to multiple components in the system.
The CompactDAQ chassis and Ethernet switch have the following power requirements per component:
Refer to the following table to determine the best power supply option for your specific system design.
|PS-14||24 VDC, 3.3 A, 80 W DIN-Mountable Industrial Power Supply|
|PS-15||24 VDC to 28 VDC, 5 A, 120 W, DIN-Mountable Industrial Power Supply|
|PS-16||24 VDC to 28 VDC, 10 A, 240 W, DIN-Mountable Industrial Power Supply|
Select the network cables needed for daisy chaining nodes and connecting rings to the Ethernet switches in the network aggregation subsystem.
NI offers the following CAT-5E Ethernet cables in various lengths.
|Model||NI Part Number||Length|
|8-Pin Male Ethernet to 8-Pin Male Ethernet, CAT-5E Ethernet Cable||151733-0R3||0.3 M|
Select the power wiring for the cDAQ-9189 chassis and Ethernet switches.
NI does not offer off-the-shelf cable assemblies for the CompactDAQ chassis or Ethernet switch. NI recommends using ferrules for stranded wires, and using the following wire gauge as defined in the specifications document for each model.
|cDAQ-9189||24 AWG to 14 AWG|
|cRIO-9805||24 AWG to 16 AWG|
Select the sensor wiring for the C Series modules.
NI does not offer off-the-shelf cable assemblies for sensors, and recommends the following wire gauges as defined in the specifications document for each model.
|NI-9213||28 AWG to 18 AWG copper conductor wire|
|NI-9215||Screw-terminal: 16 AWG to 14 AWG copper conductor wire|
|Spring-terminal: 30 AWG to 12 AWG copper conductor wire|
|NI-9235||28 AWG to 18 AWG copper conductor wire|
Select a host PC for the server subsystem that meets the following minimum requirements:
Select the storage hardware to store data logs from your tests.
Consider data throughput and test duration to choose storage hardware that is appropriately sized for your system needs.
FlexLogger encodes all data into 8 byte data points, so 2,000 channels acquired at 100 S/s produces 1.6 MB/s of data.
Refer to the following table for an example of how to determine the storage size needed for your system requirements.
|Data Throughput||Redundant Logging|
|1.6 MB/s||3.2 MB/s|
|6 GB/hr||12 GB/hr|
|140 GB/day||280 GB/day|
|1 TB/week||2 TB/week|
Select the devices to use for analyst stations.
Consider the following recommendations to ensure the devices are compatible with the Static Data Viewer.