Siemens S7-400PLC Specifikace Strana 50

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Integrating FB20 in the PLC program
50 01.00|FB20|en
The DB20 is used as an intermediate storage for the communica-
tion signals and parameters of the drive, as well as for information
from the FB20. These signals are important for service, but can al-
so be used by the user program.
For the data to be updated, the value L#50331648 is to be entered
at the dii_sf_cod input. This causes the current signals and data to
be entered into the DB.
The disadvantage is that it is detrimental to the cycle time. This
option should therefore only be used if it is absolutely necessary.
Time value for the FB20
Fig. 67
1 In FB, some time functions are required. For this, the current
PLC cycle time must be turned on at the dii_ztw_zyklus FB in-
put.
2 If the FB is called up by an alarm, the time value of the alarm is
to be entered.
4.4
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