Siemens SIMATIC ET 200S Manual page 131

Memory reset
A memory reset restores defined conditions following removal/insertion of the
micro memory card so that the IM 151-7 CPU can be restarted (warm restart).
When the memory is reset, the memory administration system of the
IM 151-7 CPU is reorganized. All blocks of the load memory are retained. All
process-related blocks are transferred again from the load memory to the working
memory; this initializes the data blocks in the working memory (they receive their
initial values from the load memory again).
The memory reset procedure and the special points associated with it are
described in Section 7.2.
Restart (warm restart)
S All DBs retain their current values.
S All retentive Ms, Cs and Ts retain their values.
S All non-retentive user data is initialized:
– M, C, T, I, O with "0"
S All processing levels start from the beginning.
S The process images are erased.
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Functions of the IM 151-7 CPU
8-19