Exchanging Data on the Network

CODESYS supports communication between control devices (PLCs) through the following functions:

• Symbol configuration: CODESYS creates symbols with certain access rights for the variables in an application. Via these symbols you can access the variables from outside, for example from an OPC server.
• Data Server: the application can establish a point-to-point connection to one or more remote data source(s) with the help of this server object. This allows you to use variable values from applications of other controllers in the “local” application, typically in a visualization. CODESYS updates the values of the variables at configurable time intervals.
• Network variables: Network variables are variables whose values are accessible to different control devices 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.

See also

• Symbol Configuration
• Network Topology
• Addressing and Routing
• Address Structures

• Network and Addressing
  • Network Topology
  • Addressing and Routing
  • Address Structures
• Symbol Configuration
• Network Variables
  • Configuring a Network Variable Exchange
• Data Server
  • Adding Data Server and Data Sources in the Project
  • Configuring the Data Sources
  • Updating via the Data Server Interface
  • Using Data Sources in Visualizations