Control Unit

A controller and the collection of I/O modules connect to it are referred to as a logical control unit (see diagram). A control unit is capable of communicating on the LAN, performing automated tasks, and logging data. The control unit defines the scope of named variables, data logging, and automation.

The control unit may be viewed as a logical entity that allows individual input/output information to be accessed over the LAN. Each control unit has a controller, and thus a unique IP address. Up to 16 smart I/O modules may be connected to the controller in various configurations. The software contains many features that allow access to the modules and their inputs and outputs.

Also see Concepts, Architecture, Data Logging, Programming

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