Siemens SIMATIC ET 200SP System Manual page 186

● The control data record is stored retentively in the CPU. Note:
– The retentivity of the control data record is independent of the retentivity settings in the
– If you write a control data record with modified configuration, the original data record
– The control data record is saved retentively in the CPU, which means that it is not
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
10.3 Transferring control data record in the startup program of the CPU
Example in FBD: Use the LABEL (jump label) and JMP (jump at RLO=1) instructions
to program a loop.
Figure 10-5 WRREC
STEP 7 memory area. This means that the memory area in which the control data
record is configured does not have to be configured as retentive for this purpose.
196 is deleted and the new data record 196 is saved retentively. The CPU will then
restart with the modified configuration.
necessary to write the control data record 196 again at a restart if the configuration is
unchanged. We recommend that a memory reset of the CPU be performed prior to
commissioning to delete any control data record that may be present.
Configuration control (option handling)
185