Siemens S7-400PLC Dokumentacja Strona 48

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Integrating FB20 in the PLC program
48 01.00|FB20|en
Integrating FB20 in the PLC program
This chapter describes how the FB20 can be used in the PLC pro-
gram.
FB20 and the data modules
The FB20 requires a data instance module.
Here, a single DB can be assigned per FB20 call-up, as can be seen
in the example project.
Because of the FB20’s multi-instance capability, data can also be
created in the static area.
Adjusting the interface/communication
The communication between the PLC and the drive takes place via
the I/O data. Since with the FB20, the addresses of the data from
the communications are specified by pointer, the data can be in
the I/O area, the peripheral area, the flag area or in the data mod-
ule.
Fig. 65
4
4.1
4.2
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