Rockwell-automation 57C421B Pulsetach Input Module/DCS 5000/AutoMax Manual de usuario descargar pdf (Pagina 25)

4Ć3

Counter

Value

Time

External

Latch Input

Slope is

constant at

200 kHz

Ċ Internal Counter Value

Latched Counter Value

Figure 4.3 Ć Counter Status During External Latch Mode

  

Timer mode is enabled by setting the Timer/Counter Select bit

(register 5, bit 13) to one. In this mode, the module's 200 kHz clock

serves as a pulse generator which provides constant and uniform

pulses to the counter's input. When the input pulses are used in

conjunction with the external latch signals, the time interval between

two events can be measured. No external wiring is needed to use

the 200 kHz clock as a counter input. See figure 4.4.

Counter

Value

Time

External

Latch

Slope is

constant at

200 kHz

Ċ Internal Counter Value

Latched Counter Value

Figure 4.4 Ć Counter Status During Timer Mode

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