7. Elementary Arithmetic Operations Design Examples 7.1 Accurate Pipe Flow Measurement r S= π π r = (d/2) 2 2 Cross-sectional area of the pipe d Control Purpose: z Measuring the flow to an accuracy of 2 decimal places. In this example, the diameter of the pipe is measured by mm , the flow rate is measured by dm/s , and the flow is measured by cm 3 /s . The cross-sectional area of the pipe = πr 2 = π(d/2) 2 and the flow = cross-sectional area Ч flow rate. Devices: Control Program:
M1002 Set value of pipe diameter and the flow rate X0 Calculation of the cross-sectional area Total Flow (mm /s ) 3 Total Flow (cm /s ) 3 DVP-PLC Application Examples 7-1 Device Function X0 Starting the measurement D0 Diameter of the pipe (unit: mm; set value: 10mm) D6 Operation result of the cross-sectional area (unit: mm2) D10 Flow rate (unit: dm/s; set value: 25dm/s) D20 Operation result of the flow (unit: mm3/s) D30 Operation result of the flow (unit: cm3/s) MOV K10 D0 MOV K25 D10 0 MUL D0 D0 D2 MUL K314 D2 D4 DDIV D4 K4 D6 DMUL D6 D10 D20 DDIV D20 K1000 D30