User`s manual

8-6 Motion Mate™ DSM314 for Series 90™-30 PLCs User's Manual – January 2001 GFK-1742A
8
Figure 8-5.
Velocity Clamping
Unidirectional Operation
Setting the axis
Command Direction
configuration to Positive Only or Negative Only results in
unidirectional follower motion. Any master axis counts in the zero limited direction are ignored.
No error is generated by counts in the zero limited direction. The
In Velocity Limit
%I bit,
however, does reflect the presence of a master command in the zero limited direction.
Example 9: Unidirectional Operation
In this example, the
Command Direction
configuration is set to Positive Only. As shown in the
velocity profile below, the slave axis follows the positive counts, but ignores the negative counts.
Note that when the master is moving negative, the
In Velocity Limit
%I bit is ON, but no status
error is generated.
Figure 8-6.
Unidirectional Operation
Enabling the Follower with External Input
Any CTL bit CTL01- CTL32 can be configured as an enable trigger for the follower axis. If a
CTL bit source is configured as an external faceplate input, that input can be used to start the
follower. When no input is selected, the follower is enabled and disabled directly by the
Enable
Follower %Q
bit. When an input is selected for the Enable Trigger and the
Enable Follower
%Q
bit is set, the next positive transition of the defined input will instantly enable the follower. The
follower will remain enabled until the
Enable Follower
%Q bit is cleared. The faceplate 24v
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