Siemens SIMATIC S7-1500 System Manual page 159

● 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
Automation system
System Manual, 09/2016, A5E03461182-AD
Example in FBD: Use the LABEL (jump label) and JMP (jump at RLO=1) instructions
to program a loop.
Figure 9-8 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.
Flexible automation concepts
9.2 Configuration control (option handling)
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