ElmoMC SimplIQ Digital Servo Drives-Bell Command Reference - Manual (Page 314)

Chapter 11:Miscellaneous Topics
11.1. Index Identification for Analog Encoders
Analog encoders normally come with an analog index signal. For example, refer to the
analog waveform in the diagram below. Because the index is made by comparing the
analog index signal to zero volts, it is wide, and will latch different positions for CW and
for CCW approaches.
Index will be sensed here for reverse approach
Index will be sensed here
for forward approach
Resulting index pulse
Interpolation angle
0 deg
360 deg
PN[10]
PN[11]
Figure 11-1: Analog encoder signals, based on the Heidenhain RON 486 datasheet
For the index to be fully repetitive, SimplIQ needs to know the electrical angle that
corresponds to each index pulse edge; these are given by the parameters PN[10] and
PN[11], respectively. The units for PN[10] and PN[11] are 65536 for 360 degrees.
SimplIQ for Steppers Application Note Development Aids
MAN-STECR (Ver. 1.1)
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