Nidec Digitax ST Indexer, User Manual, Page: 96 / 132

96
SM-Applications Modules & Motion Processors User Guide
Issue Number: 4
8.3 Marker pulse
The Second Processor is able to cache the position and revolution count at the point
when a Marker pulse is seen on the reference or feedback encoders.
Figure 8-5 Second Processor Reference Marker
The marker position is cached into Pr 90.35 and the marker revolution counter is cached
into Pr 90.36 .
The user sets Pr 90.41 to a zero and the drive sets Pr 90.41 to a 1 EVERY time a
marker is detected. The marker data must be consumed before the next marker pulse.
Figure 8-6 Second Processor Feedback Marker
The marker position is cached into Pr 90.25 and the marker revolution counter is cached
into Pr 90.26 .
The user sets Pr 90.42 to a zero and the drive sets Pr 90.42 to a 1 EVERY time a
marker is detected. The marker data must be consumed before the next marker pulse.
0
Reference
encoder
Internal drive
encoder
position
counter
Marker pulse
#90.41
#90.45
#90.36
#90.35
0
1
0
1
1
Reference encoder
marker position
Internal drive
encoder
revolution
counter
Reference encoder
marker turns
E
0
Feedback
encoder
Internal drive
encoder
position
counter
Marker pulse #90.42
#90.46
#90.26
#90.25
0
1
0
1
1
Feedback encoder
marker position
Internal drive
encoder
revolution
counter
Feedback encoder
marker turns
E