Dewetron DEWE-ORION-0824-20 Series, Technical Reference Manual

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Page 48
DEWE-ORION-0824-20x
Figure 17 shows an example of Two Pulse Edge Separation Measurement.
145
218 145
290
1260
1648 218
0 145 290 290 1260 1648
Sample Clock
Counter Start
Counter Stop
Synchronized Value
80 MHz Counter Value
1 2 3 4 5 6
Figure 17: Two Pulse Edge Separation Measurement
If the input signals are inverted the counter takes the falling edges for counting.
3.2.1.7 Motion Encoder
Motion encoders have usually three channels: channel A, B and Z. Channel A and channel B are providing
the square signals for the counter, and have a phase shift of 90°. With this phase shift the decoder is able
to recognize the rotation direction of the motion encoder. The third channel types out one pulse at a certain
position at each revolution. This pulse is used to set the counter to zero. The amount of counts per cycle at
a given motion encoder depends on the type of decoding: X1, X2, X4. All three types are provided by the
ORION-EXP-CNT8-TTL/ADJ. Some motion encoders have two outputs, which are working in a different way.
Either channel A or channel B providing the square signal, depending on the direction of the rotation. Also
this type is supplied by the ORION-EXP-CNT8-TTL/ADJ.