Echelon I/O Model Reference for Smart Transceivers and Neu Bedienungsanleitung PDF herunterladen (Seite 179)

I/O Model Reference 169

Output

on page 190 for the frequency of the waveform for various clock select

values. This model is useful for external counting devices that can accumulate

pulse trains, such as stepper motors (see

Figure 63).

The io_out( ) function does not return until all output pulses have been produced.

fout

is the time from function call to first output pulse. Therefore, the calling of

this function ties up the application processor for a period of N x (pulse period) +

fout

+ t

ret

, where N is the number of specified output pulses.

The polarity of the output depends on whether the invert option is used in the

declaration of the function block. The default is low with high pulses.

Figure 63. Pulsecount Output and Timing

Table 63. Pulsecount Output Latency Values for Series 3100 Devices

Symbol Description Typical at 10 MHz

fout

Function call to first active output pulse

edge

115 μs

ret

Return from function 5 μs

1 2 ... 174 175 176 177 178 179 180 181 182 183 184 ... 208 209

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Echelon I/O Model Reference for Smart Transceivers and Neu Bedienungsanleitung Seite 179