Edge Controls for Industrial Protocol Bridge Example Application

Published: 08/21/2020

Overview

The single host roundtrip example uses multiple instances of the Edge-Control Protocol Bridge and the OPC UA plug-in to create a roundtrip OPC UA communication loop.

Table 1

Time to Complete Approximately 20 minutes
Target System Intel® Edge Controls for Industrial (Intel® ECI) image
Software Edge-Control Protocol Bridge

 

How It Works

The example demonstrates how to configure the OPC UA plug-in to take advantage of Time-Sensitive Networking. The configuration for each segment is described in the diagram below.

In this example, the OPC UA Server will update a variable periodically. An OPC UA plug-in instantiated as an OPC UA Client (Edge-Control Protocol Bridge B) will connect to the OPC UA Server and share the variable with an OPC UA plug-in instantiated as an OPC UA Publisher (Edge-Control Protocol Bridge C). At this point, the variable has now been converted from OPC UA Client/Server model, to OPC UA Pub/Sub model. An OPC UA plug-in instantiated as an OPC UA Subscriber (Edge-Control Protocol Bridge C) will receive the published variable data and re-publish it. From here, the variable follows the same path but in reverse, finally returning to the OPC UA Server, and thus completing the roundtrip loop.

The single host roundtrip example is available in three different configurations, each utilizing a different transport method, with some being able to take advantage of Time-Sensitive Networking:

UDP Transport

The OPC UA Publisher/Subscriber nodes are configured to use the UDP transport layer to send packets. With this configuration, OPC UA traffic will be treated equivalent to normal bulk traffic.

To start the example using UDP transport:

/opt/ec-protocol-bridge/plg-opcua-rt/examples/singlehost/udp_transport.sh

Expected Results

After completion, the script should output “Test successful!” along with additional information:

TSN Transport without Priority


The OPC UA Publisher/Subscriber nodes are configured to use Ethernet II frames with VLAN ID (IEEE 802.1Q) specified to send packets. With this configuration, OPC UA traffic will be routed through a VLAN, but not subject to Priority rules (such as MQPRIO or TAPRIO). Unless the VLAN is subject to filtering, the OPC UA traffic will be treated equivalent to normal bulk traffic.

To start the example using TSN transport without priority:

/opt/ec-protocol-bridge/plg-opcua-rt/examples/singlehost/tsn_transport_without_priority.sh

Expected Results

After completion, the script should output “Test successful!” along with additional information:

TSN Transport with Priority

The OPC UA Publisher/Subscriber nodes are configured to use Ethernet II frames with VLAN ID and Priority (IEEE 802.1Q) specified to send packets. With this configuration, OPC UA traffic will be subject to Queuing Discipline rules such as MQPRIO or TAPRIO. Using TSN transport with priority enables the OPC UA traffic to adhere to strict timing requirements, typically required of real-time applications. With this model, it is possible to achieve deterministic communication between OPC UA Client/Server and Publish/Subscribe applications.

Queuing Discipline rules such as MQPRIO and TAPRIO are not enabled by default in Edge Controls for Industrial. These rules are typically enabled when configuring a Time-Sensitive Network (TSN). For detailed instructions on configuring queuing discipline rules, please refer to the Intel® Ethernet Controller I210 TSN Reference section in the Edge Controls for Industrial download package, located in the ecs-release/documentation/html/components/tsnrefsw.html file.

To start the example using TSN transport with priority:

/opt/ec-protocol-bridge/plg-opcua-rt/examples/singlehost/tsn_transport_with_priority.sh

Expected Results

After completion, the script should output “Test successful!” along with additional information:

 

Summary and Next Steps

You successfully ran the Edge-Control Protocol Bridge Example Application.

As a next step, try the Edge Controls for Industrial CODESYS Tutorial.

 

Product and Performance Information

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Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.