User`s manual

4-12 Motion Mate™ DSM314 for Series 90™-30 PLCs User's Manual – January 2001 GFK-1742A
4
Configuration
Parameter
Description Values
VersaPro
Defaults Units
Ref
Cmd Position 3
Actual Position 3
Cmd Position 4
Actual Position 4
Follower Enable
Trigger
Follower Enable Input
Trigger
None
CTL01-CTL32
None N/A 5.30
Follower Disable
Trigger
Follower Enable Input
Trigger
None
CTL01-CTL32
None N/A 5.31
Follower Disable
Action
Follower Disable Action Stop
Inc Position
Abs Position
Stop N/A 5.32
Ramp Makeup
Acceleration
Follower Ramp Makeup
Acceleration
1...MaxAccUu*
10,000
2
sec
User Units
5.33
Ramp Makeup Mode Follower Ramp Makeup
Mode
Makeup Time
Makeup Velocity
Makeup Time N/A 5.34
Ramp Makeup Time
Follower Ramp
Acceleration Makeup Time
0…32000 0 mSec 5.35
Ramp Makeup
Velocity
Follower Ramp Makeup
Velocity
1...MaxVelUu* +100,000
sec
User Units
5.36
* See Table 4-8 for calculating MaxAccUu, MaxPosnUu, and MaxVelUu.
5.01 User Units, Counts
. The User Units to Counts ratio sets the number of programming units for
each position feedback count. This allows the user to program the DSM314 in application-specific
units. The User Units and Counts values must be within the range of 1 to 65,535. The User Units
to Counts ratio must be within the range of 8:1 to 1:32. For example, if there is 1.000 inch of travel
for 8192 feedback counts, a 1000:8192 User Units:Counts ratio sets 1 User Unit equal to 0.001
inch. Default is 1:1.
The User Units to Counts ratio sets the number of position programming units for each feedback
count. It is a requirement to set this value correctly for the mechanical systems coupled to the axis,
otherwise movement to unsafe and inaccurate positions may occur.
Note
It is important to set this relationship at the beginning of the configuration
session; most other configuration fields are specified in user units
.
For example, Velocity will be specified in user units per second and Acceleration will be specified
in user units per second per second.
This ratio is a very powerful scaling feature. A User Unit to Counts ratio can be configured to
allow programming in other than default counts. In a simplified example, suppose an encoder
feedback application has an encoder that produces 1,000 quadrature counts per revolution (250
lines) and is geared to a machine that produces one inch per revolution. The default unit would be
one thousandth of an inch per count. However, you may want to write programs and use the
DSM300 Series module with metric units. A ratio of 2540 User Units to 1000 Counts can be