Control Techniques UD51 User Manual page 15

In order to synchronise the simulated encoder output signals to the marker
output pulse the source encoder marker pulse must occur at the correct
position with respect to the source encoder input signals A and B.
Also note Pr 16.12 the marker pulse output synchronisation disable, should
be set to zero (default) enabling this (Pr 16.12 = 1) will result in the marker
pulse output becoming present in any one of four quadrants.
Marker Output Pulse Position
The marker output pulse is derived from the same source as the simulated
encoder outputs A and B.
The drive can ensure that the simulated encoder output signals A, A\ and B,
B\ are produced so that the marker occurs whilst the A and B signals are low
(A\ and B\ high) as shown in Figure 5-3.
For the synchronisation to function the leading edge of the source encoder
marker pulse must occur on the falling edge of signal B whilst signal A is low
(as above).
If the source encoder provides a marker pulse when the A and B signals are
high as shown below and a simulated encoder output is required with the
synchronisation as detailed above, the wiring connections of the quadrature
signals have to be modified as detailed in Figure 5-4.
UD51 User Guide
Issue Number: 5
Figure 5-3 Marker Pulse Active High
A
B
Z
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Source Encoder
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