The PROFINET IO Connector allows you to collect the data from the PROFINET network in a high time-resolution and provide this data to the Databus for processing by other apps. An important function is to store the data in IIH Essentials. IIH Essentials is a central data source for several other apps.
The cyclic data is provided in a raw Data Format (binary payload) when highest time-resolution is needed (to focus on performance).
The PROFINET IO Connector and Cyclic Read PROFINET IO Data support JSON as data format.
NOTICE
The overhead due to the data format JSON is approximately factor 10. This means the number of bytes sent through the network is approximately 10 times greater than binary format.
Therefore, for higher time-resolution with big number IO data, the binary format is a better choice. Additionally, the parsing of JSON data needs more CPU power than reading the raw Data Format.
The information like structure of the data is used to process the raw Data Format (binary payload). This is described in the metadata. The content of the metadata depends on the tag definitions. When no tags are defined, the metadata looks different than with defined tags.