User's Manual

PMAC User Manual
Setting Up a Motor 59
Parallel position feedback requires one of the conversion formats $20, $30, $60, or $70 (see below).
90
B A B A
CONVERT TO
A/B QUAD
90 DEGREES
ENCODER COUNTER
24 BIT
DATA BUS
DATA LATCH
DSP-GATE
INTERPOLATE INTO 32 INCREMENTS
LASER
INTERFEROMETER
OR
INTERPOLATED
ENCODER
SYNCHRONIZER
AND
INTERPOLATOR
FAULT "MSB"
+LIM
-LIM
HF
"C" "LSB"
5 BITS
DIVIDER
EXT.
20 MHz
HOME FLAG
C CHANNEL
NOTE: A 4 AXIS PMAC CAN HANDLE ONLY 2 AXIS OF CONTROL
WHEN USING BIT INTERPOLATION FOR ENCODER.
ALL OUTPUTS TO BE LATCHED ON RISING
EDGE OF CLOCK
A
B
"SCLK"
A/B QUAD 10 MHz MAX.
"E" POINT SELECTORS
SELECT CLOCK FREQUENCY OR SOURCE AS DESIRED
USE THESE INPUTS ON PMAC'S "EVEN" CHANNEL FOR "ODD" CHANNEL'S INTERPOLATED POSITION ENCODER BITS.
PMAC
E38 E37 E36 E35 E34
32
increments
Figure 8 Interpolated Encoder Feedback