Siemens S7-300 appendix Restart warm start, Reference

Memory concept

4.2 Memory functions

Restart (warm start)

•All retentive DBs retain their actual value (non-retentive DBs are also supported by CPUs with Firmware >= V2.1.0. Non-retentive DBs receive their initial values).

•The values of all retentive M, C, T are retained.

•All non-retentive user data are initialized:

– M, C, T, I, O with "0"

•All run levels are initialized.

•The process images are deleted.

Reference

Also refer to CPU memory reset by means mode selector switch in the section

Commissioning in the CPU 31xC and CPU 31x Operating Instructions.

4-14	CPU 31xC and CPU 31x, Technical data
	Manual, Edition 08/2004, A5E00105475-05