Configuration control (option handling)
10.3 Transferring control data record in the startup program of the CPU
Distributed I/O system
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Example in FBD: Use the LABEL (jump label) and JMP (jump at RLO=1) instructions
to program a loop.
Figure 10-5 WRREC
● 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
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.
– If you write a control data record with modified configuration, the original data record
196 is deleted and the new data record 196 is saved retentively. The CPU will then
restart with the modified configuration.
– The control data record is saved retentively in the CPU, which means that it is not
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.