Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 76)

Memory concept
4.2 Memory functions
CPU 31xC and CPU 31x, Technical data
4-14
Manual, Edition 08/2004, A5E00105475-05
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.