From the course: Learning SCADA: Collect, Analyze, and Visualize Data for Industrial Automation

Unlock the full course today

Join today to access over 24,400 courses taught by industry experts.

OPC connection mechanism

OPC connection mechanism - Ladder Logic Tutorial

From the course: Learning SCADA: Collect, Analyze, and Visualize Data for Industrial Automation

Start my 1-month free trial Buy for my team

OPC connection mechanism

“

- [Narrator] For OPC connection in the parent/child model, the parent application controls one or more other applications, the children. Once the parent/child relationship is established, the direction of control is always from the parent to the child, from server to client, which means an OPC server will only transfer data to and from a data source if an OPC client commands to it. In the example you see, the data source is a PLC collecting data from field devices. The OPC server converts the data coming from hardware devices into the OPC protocol. The OPC client software, on the other hand, is any program that receives the data and connected to a hardware such as an HMI. The OPC client uses the OPC server to get data from or send commands to the hardware. Here are some examples of different OPC servers and clients.

Contents