Siemens Simatic S7-300 Technical Data Manual page 76

Memory concept
4.2 Memory functions
Restart (warm start)
• All retentive DBs retain their actual value (non-retentive DBs are also supported by CPUs
• The values of all retentive M, C, T are retained.
• All non-retentive user data are initialized:
• All run levels are initialized.
• The process images are deleted.
Reference
Also refer to
Commissioning
4-14
with Firmware >= V2.1.0. Non-retentive DBs receive their initial values).
– M, C, T, I, O with "0"
CPU memory reset by means mode selector switch
CPU 31xC and CPU 31x Operating Instructions
in the
in the section
.
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05