Siemens SIMATIC S7-200 - Example of Real Number Conversion Instruction for FBD

IEC 1131-3 Instructions
10-34
S7-200 Programmable Controller System Manual
A5E00066097-02
FBD
Application
101
VD0
VW20
101.0
VD4 2.54
VD8 256.54
V12 257
Count = 101 inches
2.54 constant (inches to centimeters)
256.54 centimeters as real number
257 centimeters as integer
1234
BCDI
VW100
04D2VW100
Double Integer Integer to Real and Truncate BCD to Integer
I_TO_DI
EN
IN OUT%VW20 %AC1
ENO%I0.0
DI_TO_R
EN
IN OUT%AC1
ENO
MUL
EN
IN1
IN2
OUT
temp_var
%VD4
%VD8
ENO
R_TO_DI
EN
IN OUT%V8 %VD12
ENO
BCD_TO-I
EN
IN OUT%VW100 %VW100
ENO%I3.0
Network 1
Network 2
temp_var
Figure 10-13 Example of Real Number Conversion Instruction for FBD