GFK-2571N May 2018 151
Appendix A PROFINET IO Performance Examples
Note: The configurations and performance numbers shown here are examples; Actual performance timings
will vary depending on your exact configuration and network setup.
This section presents various PROFINET IO systems and their measured I/O performance for a simple Discrete
IO loopback in an RX3i IO-Device and in a VersaMax IO-Device. As these systems are not identical in their
configuration or setup, additional details of each system configuration are provided in the sections below.
The IO Loopback measurements were done by wiring the outputs of a discrete output module directly to the
inputs of a discrete input module, and using Ladder Logic to measure the time difference between setting the
outputs and reading the same data on the corresponding inputs. Proficy Machine Edition was attached to the
RX3i during testing. The average, minimum, and maximum loopback times were captured from a 4-hour
sample period. In addition, since the CPU sweep time is a primary factor in the accuracy and precision of the IO
Loopback times recorded, the average and maximum CPU sweep times for each system are given.
Note: CPU Sweep time variations between systems are not completely a function of varying PROFINET IO. It
was also influenced by variations in logic executed and main rack configurations.
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