Nidec Digitax ST Indexer, User Manual, Page: 95 / 132

SM-Applications Modules & Motion Processors User Guide
95
Issue Number: 4
S
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Figure 8-4 Apps Lite/Apps Lite V2 and Digitax St Indexer Feedback Freeze Input
The encoder revolution counter is cached into Pr 90.19 and the encoder position is
cached into Pr 90.20 .
The freeze position of both the reference and feedback encoders can be captured on
the rising or the falling edge of the freeze pulse. This is determined by setting parameter
Pr
81.43 to either 0 (rising edge) or 1 (falling edge). Pr 81.42 enables the position to be
written to Pr 90.19 and Pr 90.29 and the revolution counters to be written to Pr 90.20
and Pr 90.30 .
When a freeze input is seen Pr 90.18 and Pr 90.28 are set to 1 automatically so that the
position can be written to Pr 90.19 and Pr 90.29 and the revolution counters can be
written to Pr 90.20 and Pr 90.30 . Pr 90.18 and Pr 90.28 must be reset to zero if the user
wants to update the data again on the next freeze pulse.
Feedback
encoder
E
Internal drive
encoder
position
counter
Freeze pulse
#81.43 #90.48
#90.18
#90.20
#90.19
0
1
0
1
0
1
Feedback encoder
freeze position
Position
Module
Detection
select
Set on detection
Reset to arm
freeze
Internal drive
encoder
revolution
counter
Feedback encoder
freeze turns