Method and industrial controller for the synchronized calling of a function block in a control program having opc ua

A method for calling a function block of a control program of an industrial controller, wherein

• the industrial controller comprises an OPC UA server,
• the industrial controller communicates with an OPC UA client, in particular by means of the OPC UA communication protocol,
• and the function block is requested starting from an OPC UA call of the OPC UA client,
• wherein when the function block is requested
• in a first step,
• an OPC UA call directed thereto is sent from the OPC UA client to the OPC UA server of the industrial control
• in a second step,
• the OPC UA call is stored by the OPC UA server of the industrial controller,
• in a third step,
• (IN1-par) IN parameters transferred together with the OPC UA call are copied (IN2-par) to corresponding IN parameters of the function block of the control program, and
• in a fourth step,
• at a previously defined point within a control task of the industrial controller, the function block of the control program is called and the IN parameters of the function block are processed.