The load program is part of the STEP 7 program in the S7 controller.
The size (length) of the load program is selected so that a "cycle time without communication" results in the S7 controller.
Definition "Cycle time without communication":
The "cycle time without communication" is the cycle time set in the S7 controller as soon as the S7 controller is no longer subjected to the communication.
For the S7 controller this means that no data are being sent.
Defining a "cycle time without communication"
In order to define the "cycle time without communication", a so-called load program is loaded into the S7 controllers.
This load program enables simulating the practice relevant case of communication and other control tasks being simultaneously performed in the S7 controller.
The load program is implemented with a simple loop which does not have any influence on the remaining program.
The variation of the loops can be used to set the "cycle time without communication".
Relationship with the parameter "load program" in the user interface
For this measurement, the length of the load program has always been selected in such a way that a no-load cycle
time ("cycle time without communication") of 20ms or 100ms develops.
If ,for example, the parameter "20ms" is selected in the user interface, this means:
The load program loaded in the S7 controller is selected so that a "cycle time without communication" of typically 20 ms is set in the S7 controller.