Connector

OPC UA

Stream and write nodes on OPC UA servers

Category

Industrial

Kind

source

Capabilities

StreamsAssetsCommandsOperationsEntities

Runs on

Linux x64Linux ARM64macOS Apple siliconmacOS IntelWindows x64

Stream and write nodes on OPC UA servers, the industrial standard used by PLCs, SCADA systems and factory equipment.

#What you get

• Live nodes — each node you list is a channel, named by its alias.
• The server's own timestamps — when the server reports when a value was sampled, Phloem uses that time, not the time it was read.
• Setpoints — only on nodes you declare writable, with their type. A typo cannot write the wrong node, and a value of the wrong type is refused. Each write is read back.
• One server per input, named by its Device name. Channels read /opcua/opc1/….

#Setup

1. Note the server's endpoint URL, usually opc.tcp://host:4840. Only anonymous endpoints with no security are supported, the usual lab default.
2. In Inputs, add OPC UA and fill in:
   • Device name — a short label, e.g. opc1
   • Endpoint URL — opc.tcp://192.168.1.70:4840
   • Nodes — temp=ns=2;s=Temperature, pres=ns=2;s=Pressure (an alias, then the server's NodeId)
   • Writable nodes — setpoint=ns=2;s=Setpoint:double, run=ns=2;s=Run:bool (alias=NodeId:type — bool, sbyte, byte, int16, uint16, int32, uint32, int64, uint64, float, or double, matching the node's type on the server)
   • Poll rate — e.g. 1
3. Press Test connection. It reads the first node you listed.
4. Nodes appear on Live. In the Channels table, give each a name and unit, such as temp → reactor temperature, degC.

#Notes

• A bad NodeId or unreachable endpoint is reported at startup.
• Every write is recorded.
• Endpoints secured with certificates are not supported yet.

#Supports

• Any OPC UA server (anonymous endpoints; monitored nodes by NodeId)
• Node writes on declared write_nodes (alias=NodeId:type), read back after every write

#Connection fields

Every field the Add input form shows for this connector.

Updated November 6, 2026