Siemens SIMATIC TI505 Instrukcja Obsługi Pobierz pdf (Strona 115)

Specifications

C-4

High Speed Counter Encoder Module User Manual

Input Specifications (continued)

The

input filter eliminates glitches or noise in the incoming signal from

being counted. The input signal must have a high and low pulse width

greater than the specified filter period values listed below for proper

operation. Figure C-2 shows an example of a filtered signal.

100 kHz filter: 4 microseconds minimum required to count high or low input

25 kHz filter:

16 microseconds

6.25 kHz filter:

64 microseconds

1.5 kHz filter:

256 microseconds

400 Hz filter:

1024 microseconds

100 Hz filter:

4096 microseconds

Input

Signal

Filtered Signal

to Counter

noise

filter

period

External

Figur

e C-2

Filtering

Noise fr

om Input Signal

Continuous wave-forms of a frequency higher than the specified filter have

a rejection equal to or greater than 20 dB per decade above the cutoff

frequency.

Due to the input circuit delays, the minimum input high and low pulse

widths at the 100 kHz filter setting are shown in Figure C-3.

Input

Signal

Filtered Signal

s

ypical delay time: 300 nanoseconds turn on; 400 nanoseconds turn of

300 ns 400 ns

3.9

s

4.1

s

Internal

External

Figur

e C-3

Minimum

High and Low Pulse W

idths for 100 kHz Signal

Input Filter

Characteristics

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 126 127

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