Working with Control Networks¶

With the following functionalities, CODESYS supports communication between controllers (PLC) and the insertion of a safety device below a PLC:

• Symbol configuration: CODESYS creates symbols with certain access rights for the variables in an application. With these symbols, you can access the variables from outside, for example from an OPC server.
• Data source manager: Manages the connection settings and the data transmission to remote devices (data sources). The transmitted data is mapped in data source variables that are accessed in the visualization or local application. An example of this is a control panel that controls remote devices and visualizes the state of the device as an HMI application.
• Network variables: Network variables are variables whose values are accessible to different controllers in the network. The variables must be defined in rigid, identical lists in both the transmitter device and the receiver device. These lists are assigned to applications, but can be located in different projects.
• A safety device can be inserted below a PLC in the device tree. The communications links of the safety devices to the field devices, controller networks, and development system are routed via this controller.

See also

• Symbol Configuration
• Data Source Manager
• Network Variables
• Network Topology
• Addressing and Routing
• Address Structures
• Subordinate Safety Controller