OPCDA Client

Driver that can be used to connect to OPC-DA (Classic) servers. The functionality is similar to the newer OPCDA, but will work just in Windows because it makes use of COM objects.

Parameters

Aside from the common parameters described in the communication_driver docs, this driver includes:

Parameter	Default Value	Description
server	Matrikon.OPC.Simulation.1	Name of the OPC DA server to connect to.
async_connection	False	This variable can be set to true to use async reading (subscription).

Setup data

The setup data will give values to the parameters required and will specify the I/O variables info.

{
  "parameters": {
    "server": "Matrikon.OPC.Simulation.1",
    "async_connection": true
  },
  "variables": {
    "sensors": {
      "datatype": "byte",
      "size": 1,
      "operation": "write"
    },
    "actuators": {
      "datatype": "byte",
      "size": 1,
      "operation": "read"
    }
  }
}

note

The setup_params in the generic PLC components for opcda_client will need the following format:

{ "server": "Matrikon.OPC.Simulation.1", "async_connection": true }