User`s manual

16-6 Motion Mate™ DSM314 for Series 90™-30 PLCs User's Manual – January 2001 GFK-1742A
16
Note
1. For any Cyclic CAM, the master High/Low Position limits in Hardware
Configuration must be set up according to the master rollover points in the
CAM profile. The master axis Low Limit must equal the first master position
in the profile. The master High Position Limit must be equal to the (Last
Master Position – 1) in user units. This is because a cyclic profile's first and
last point are the same on the physical device.
2. For a Linear Cyclic CAM, the master axis rolls over at the profile's end
points but the slave axis does not. The maximum and minimum profile
values for the slave axis must lie within the High/Low limits specified for
the corresponding axis in Hardware Configuration.
M
aster Axis ->
0
1
80
360
o
o
o
500
1500
Slave Axis ->
Figure 16-6. Linear Cyclic CAM
Circular Cyclic CAM
A Circular Cyclic CAM has a profile that keeps repeating until an event causes it to exit.
Furthermore, a Circular Cyclic CAM has different numerical start and end slave axis positions (see
Figure 16-7). Both the master axis and the slave axis roll over at the profile end points. A rotary
knife is an example of a Circular Cyclic CAM.
Constraint
: The
entire
slave profile (including interpolated values) must lie between the
minimum
and
maximum
slave position limits, where the
minimum
and
maximum
slave limits are defined as
follows:
Minimum Slave Value Maximum Slave Value Condition
First Slave Point Last Slave Point Last Point > First Point
Last Slave Point First Slave Point Last Point < First Point