Siemens S7-400PLC Especificações Página 58

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Integrating FB20 in the PLC program
58 01.00|FB20|en
Fig. 74
The four output signals (bio_di_01_status, bio_di_02_status,
bio_di_03_status, bio_di_04_status) on the FB20 show the status
of the digital inputs on the board.
The I/Os of the module are regularly queried by the FB20 after X
commands.
Since more important functions are sent to the module or queried,
and/or called up more frequently, it may take more PLC cycle time
for the inputs/outputs to be processed. Therefore, these signals
are only suitable for non-critical application times.
Therefore, these signals are only suitable for non-critical applica-
tion times.
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