6.3 PROFINET Cyclic IO Telegram Model

Figure 10 shows the Cyclic IO Telegram model accessible from the PN Submodule in the PROFINET aspect of the Information Model. If provided by the Server, the Telegram Object associated with one PN Submodule aggregates the Input and the Output Telegram Objects. The individual data points or variables within a Telegram are represented by Signal Objects. The Input Telegram and Output Telegram Objects aggregate the Signal Objects and provide additional information like provider status and consumer status.

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Figure 10 – PROFINET Telegram Model

The Offset Property of the PnIoSignalType Object contains the position as byte offset of the signal from the start of the binary telegram.

The 0:RepresentsSameEntityAs Reference connects PnIoSignalType Objects with the “ProcessValue” Variables containing the Process Value provided by RIO Channel Objects in the functional aspect of the Information Model.