
Parker Hannifin
System Configuration 31
Hardware Limit Enable
By default, positive and negative hardware limits are disabled. You
can enable the limits by setting the appropriate control bits (bit 20=
positive hardware limit enable, bit 21= negative hardware limit
enable). You can also control the hardware limits using the HLIM
command.
HLIM Hardware Limits
Value Description
0 Disables positive limit and negative limit
(default)
1 Enables positive limit and disables
negative limit
2 Disables positive limit and enables
negative limit
3 Enables positive limit and negative limit
In the Configuration Wizard, you can enable hardware limits in the
Faults dialog.
Software Limits
For each axis, you can set a pair of absolute positions that act as
software-based limits. Between these limits, unlimited motion can
occur. If a software limit is crossed, the controller stops motion for
that axis, its master, and attached axes.
Parameters 4600-4615 provide Control and Status bits for software
limits. You can enable the individual positive and negative limits, as
well as check the current and previous states of the limits.
NOTE: Software limits do not use the Kill All Motion Request (KAMR)
bits. Therefore, you can resume motion in the opposite
direction of the software limit. For example, if the
application encounters a positive software limit and stops,
the application can resume motion in the negative
direction.
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