Detailed description
2.14 Programming tips with STEP 7
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
263
The modified version of the program call starts from here.
Here the call in OB 100 is displayed.
CALL FB 2, DB 110 (
Req := FALSE,
NumVar := 2, //Read 2 variables
Addr1 := NCVAR.C1_RP_rpa0_0
Line1 : W#16#1
Addr2 := NCVAR.C1_RP_rpa0_0
Line2 . W#16#2
RD1 := P#M 4.0 REAL 1,
RD2 := P#M 24.0 REAL 1,
Here the call still remaining in OB 1 is displayed.
CALL FB 2, DB 110 (
Req := M0.0,
Error := M1.0,
NDR := M1.1,
State := MW 2,
Note
Owing to this measure, a shorter cycle time is achieved in OB 1, because the static
parameter values need not be copied in the instance DB in each OB-1 cycle.
The savings of this variant:
The cyclic copying effort of 3 integer values and 4 ""ANY" parameters with respect to the
instance DB, which results from 3 time loading of a constant in the instance data block. In
case of each "ANY" transfer, constants are loaded in the data block 4 times with subsequent
transfer.
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