Software Limits - Omron NX-series User Manual

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Software Limits

Actual positions can be monitored in the MC Function Module software. This function is separate from
the hardware-based limit input signals. Set the range to monitor by setting the software limits in the
Positive Software Limit and Negative Software Limit axis parameters. During normal positioning, motion
is possible within the range of these software limits. Set software limits to prevent potential damage to
machinery caused by mistakes in the user program or improper operation.
Negative software limit
Negative limit input signal
Mechanical stopper
 Axis Parameters That Are Related to Software Limits
Parameter name

Software Limits

Positive Software
Limit
Negative Software
Limit
*1. If the actual position goes beyond a software limit during execution of a movement instruction that has a De-
celeration input variable, the axis decelerates to a stop at the deceleration rate given by Deceleration. If the
actual position goes beyond a software limit during execution of a movement instruction that does not have a
Deceleration input variable, the axis decelerates to a stop at the maximum deceleration that is set in the axis
parameters.
*2. Positions can be set within a 40-bit signed integer range when converted to pulses.
You can use the axis settings of the Sysmac Studio, the MC_Write (Write MC Setting) instruction, or the
MC_WriteAxisParameter (Write Axis Parameters) instruction to set the above axis parameters.
If any setting values are changed for an axis or axes group in operation, those settings are enabled
when the next operation begins.
Software limits function in the following two cases based on the axis operation state and the motion
control instruction that is used.
NX-series NX1P2 CPU Unit Built-in I/O and Option Board User's Manual (W579)
Software range of motion
Electrical range of motion
Mechanical range of motion
Function
Select the software limit function.
0: Disabled
1: Deceleration stop for command position
2: Immediate stop for command position
3: Deceleration stop for actual position
4: Immediate stop for actual position
Set the software limit in the positive direction.
The unit is command units.
Set the software limit in the negative direction.
The unit is command units.
6 Introduction of Motion Control Functions
Positive software limit
Positive limit input signal
Mechanical stopper
Setting range
0 to 4
*1
*1
*2
Long reals
Default
6
0: Disabled
2,147,483,647
−2,147,483,648
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