Rockwell Automation 1391ES AC Servo Controller - Manual (Page 39)

Inputs, Outputs and Adjustments
Chapter 5
5-37
Figure 5.3
A Quad B Board Switch (S3) Settings
A
A (NOT)
B
B (NOT)
Z
Z (NOT)
2 Marker Pulses per
Revolution
CCW Rotation of Motor Shaft
(similar to Allen-Bradley
845H)
Line
Count/
Revolution
2048
1024
512
256
S3-2
Switch Set-
ting
OFF
OFF
ON
ON
S3-1
Switch Set-
ting
OFF
ON
OFF
ON
– ON –
2 1
S3
When using the A Quad B option with Allen-Bradley IMC motion
controllers, the AMP parameters will be set according to the line count
selected. In general, one parameter must be justified when using this
device. The normal line counts per cycle of the encoder must be divided
by two since the controller will see two markers per cycle.
Example (using an IMC 120 Controller)
With switch S3 set to 1024 lines per revolution (S3-2 OFF, S3-1 ON), the
lines per cycle of the position feedback device (located in the Feedback
Parameters File) must be 2048.
1024 x 4 = 4096
/
2 = 2048
Lines/Revolutio
n
2
Markers/Revolution
(Quadrature)