
Integrating FB20 in the PLC program
01.00|FB20|en
49
To ensure that data consistency is maintained, the data should be
read and/or written via the SFC14/SFC15. Accordingly, the ad-
dresses in the flag area or the data module must be cached before
passing on the addresses to the FB20.
SCHUNK recommends specifying the starting bytes of the inputs so
that they appear in the cross-reference list, so that improved soft-
ware maintenance is possible.
Data module for the service or system data
Fig. 66
4.3
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