Siemens High Speed Counter and Encoder Module SIMATIC 505 Manuale Utente Scaricare il pdf (Pagina 38)



Applications

5-5

Series

505 High Speed Counter

and Encoder Module User

’

s Manual

5.2 Flow Rate Example

5.2.1

Description A

flow meter outputs 200 pulses per gallon. The program requires

calculation of flow rate in gallons per minute (GPM).

5.2.2

Solution

Configure the HSC as WX9–WX1

1, WY12–WY16. Attach channel 1 to the

flow meter

. The HSC accumulates flow meter pulses for the duration of a

1-second fast timer

. In the controller

, accumulated pulses are scaled to

GPM by the following calculation (using the controller memory locations).

Equation: GPM = Pulses per Sec  60 ? 200

Program Locations: (V23,V24) = (WX10)  (V20) ? (V19)

Following each calculation, reset the HSC, restart the T

imer

, and perform

a new calculation 1 second later

TMRF2

P= 01.000

C23C20

BITC1

WY12

C25C23

MULT1

A: WX10

DIV1

A: V21

BITS1

WY12

C24C23

C23

C25

C24

: ONE

SECOND TIMER HAS EXPIRED, COMPUTE FLOW

RESTAR

T TIMER ON NEXT SCAN

SCALE COUNTER V

ALUE IN GALS/MINUTE PUT RESUL

IN LOCA

TIONS V23–V24, RESET HSC CHANNEL 1

TURN OFF CHANNEL 1 RESET T

O HSC

V20

V21

V19

V23

Figure 5-5 Ladder

Logic for Flow Rate Example

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 52 53

Commenti su questo manuale

Nessun commento

Siemens High Speed Counter and Encoder Module SIMATIC 505 Manuale Utente Pagina 38

Commenti su questo manuale

Prodotti e manuali riguardandi no Siemens High Speed Counter and Encoder Module SIMATIC 505