Siemens S7-300 appendix Extending the cycle time

Cycle and reaction times 5.2 Cycle time

Extending the cycle time

Always make allowances for the extension of the cycle time of a user program due to:

•Time-based interrupt processing

•Process interrupt processing

•Diagnostics and error processing

•Communication with PGs, Operator Panels (OPs) and connected CPs (for example, Ethernet, PROFIBUS DP)

•Testing and commissioning such as, e.g. status/controlling of variables or block status functions.

•Transfer and deletion of blocks, compressing user program memory

•Write/read access to the MMC, using SFC 82 to 84 in the user program

•Ethernet communication via integrated PROFINET interface

•CBA communication via PROFINET interface (system load, SFC call, update at scan cycle check point)

•PROFINET IO communication via PROFINET interface (system load)

5-4	CPU 31xC and CPU 31x, Technical data
	Manual, Edition 08/2004, A5E00105475-05