OPC Unified Architecture (OPC UA) is a machine to machine communication protocol for industrial automation developed by the OPC Foundation. Distinguishing characteristics are: Focus on communicating with industrial equipment and systems for data collection and control. ...OPC Unified Architecture - Wiki
Make the manufacturuing data available so that it can be visialized and trigger alerts.
- OPC UA Demo
- OPC UA Server
- OPC UA Agent/Client : Presumely it will be deployed on the local network to interact with OPC UA Server(s)
- Remote Monitor : Critical information should be delivered for an immediate attention
- Visualization
In order to keep the temperature under control, at least two fans should be functional. Otherwise, the temperature goes up gradually (max 100). OPC UA agent sends an alert message at a certain level (re-sends if the temperature is still high after timeout) and waits for the next action (e.g., turn on the backup unit)
- OPC UA Agent monitors Temperature and 3 Fans.
- Disable Fan #1 from OPC UA Server. (simulating hardware malfunction)
- Send an alert message.
- Turn on the backup unit (Fan #3). Auto-remediation should be triggered in real world.
Install node-red-contrib-opcua from "Manage palette"
104-opcuaserver.js : 4 variables are added for this demo.
addressSpace.getOwnNamespace().addVariable({
componentOf: vendorName,
nodeId: "ns=1;s=Temperature",
browseName: "Temperature",
dataType: "UInt16",
value: {
get: function () {
return new opcua.Variant({
dataType: opcua.DataType.UInt16,
value: Temperature
});
},
set: function (variant) {
Temperature = opcuaBasics.build_new_value_by_datatype(variant.dataType, variant.value);
return opcua.StatusCodes.Good;
}
}
});
addressSpace.getOwnNamespace().addVariable({
componentOf: vendorName,
nodeId: "ns=1;s=Fan1Status",
browseName: "Fan1Status",
dataType: "UInt16",
value: {
get: function () {
return new opcua.Variant({
dataType: opcua.DataType.UInt16,
value: Fan1Status
});
},
set: function (variant) {
Fan1Status = opcuaBasics.build_new_value_by_datatype(variant.dataType, variant.value);
return opcua.StatusCodes.Good;
}
}
});
// Same for ns=1;s=Fan2Status, ns=1;s=Fan3Status
Install node-red-contrib-opcua from "Manage palette"
Blynk lets you connect your devices to the cloud, design apps to control them, analyze telemetry data, and manage your deployed products at scale.
| Blynk Widget | Blynk Pin | OPC UA Variable |
|---|---|---|
| SuperChart | Virtual Pin 0 | ns=1;s=Temperature |
| Button(Switch) | Virtual Pin 1 | ns=1;s=Fan1Status |
| Button(Switch) | Virtual Pin 2 | ns=1;s=Fan2Status |
| Button(Switch) | Virtual Pin 3 | ns=1;s=Fan3Status |
Only Virtual Pin 3 is writable for this demo.
- Install
node-red-contrib-influxdbfrom "Manage palette" - Install InfluxDB
$ brew install influxdb
- Install Grafana
$ brew install grafana
- Start Services (
$ brew tap homebrew/servicesif necessary )
$ brew services start influxdb grafana
The following data were added to temperature measurement. Use drop measurement <measurement-name> to delete.
Conceptually you can think of a measurement as an SQL table, where the primary index is always time.tags and fields are effectively columns in the table. tags are indexed, and fields are not.
Created multiple regions to visualize the regional data. region east_[2|3|4|5|6] were also simulated. The following msg.payload was sent to influxdb batch node.
return { payload : [
{
measurement: "temperature",
fields: {
temp: value - value2
},
tags:{
region: "east-2",
ipaddr: "192.123.22.34"
}
},
{
measurement: "temperature",
fields: {
temp: value + value2
},
tags:{
region: "east-3",
ipaddr: "192.123.23.34"
}
},
...
]
- OPC Foundation
- OPC UA Stack 1.0.0.125
- Tutorial: Using OPC-UA with FRED
- NodeOPCUA - OPC UA stack fully written in javascript and NodeJS
- InfluxDB - the open source time series database
- Grafana - The ohttps://www.influxdata.com/pen platform for analytics and monitoring
- Open Source OPC UA Application Server and OPC UA Client/Server C++ Libraries
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