Siemens High Speed Counter and Encoder Module SIMATIC 505 Manuale Utente Scaricare il pdf (Pagina 14)

Overview

1-8

Series

505 High Speed Counter

and Encoder Module User

’

s Manual

Counting Modes (continued)

1.5.2

Quadrature

Mode

For quadrature mode, each channel counts according to rising and/or



falling edges. T

ypical devices for quadrature inputs are optical encoders.

Different quadrature modes are selected based on the resolution required

by the application and the encoder used.

1.5.3

1X Quadratur

The module counts on the edges of the A input pulses.



When input A leads input B, the HSC counts up on each rising edge of

input A.



When input B leads input A, the HSC counts down on the falling edge

of input A.

Figure 1-5 illustrates the relationship between inputs A and B and the

count value in

1X Quadrature mode.

Count Value

1X Quadrature

12 10

25 s

min

Count Up

(A Leading)

Count Down

(B Leading)

26.7

s

min

Figure 1-5

Quadrature Mode

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 52 53

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