Lenze PLC Designer PLC-Designer (R2-x) SoftMotion - Manual (Page 192)

DMS 5.2 EN 03/2011 TD17
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192
L-force | PLC Designer - SoftMotion
The SM_CNC.lib library
SMC_Interpolator2Dir
7.11 SMC_Interpolator2Dir
In terms of its function and how its inputs and outputs are assigned, this program
organisation unit is the same as the SMC_Interpolator function POU. The only difference is
that SMC_Interpolator2Dir can also interpolate a path in reverse.
For this purpose, a negative value is assigned to the dOverride input, whereupon
SMC_Interpolator2Dir interpolates in negative direction. The analogue speed input of a
handwheel can be at this input so that the user can travel forwards and backwards at any
speed.
Additional inputs and outputs (VAR_IN_OUT)
nDirection: SMC_Direction
This program organisation unit shows the direction in which it is currently moving.
Possible values: IPO_positive, IPO_negative and IPO_standstill.
The following preconditions must be met in order for this program organisation unit to be
used:
 The entire path must fit in poqDataIn. As the program organisation unit must move
forwards and backwards alternately, the complete path must be available in the
memory.
 An additional program organisation unit, SMC_Interpolator2Dir_SlowTask, is called:
This program organisation unit is responsible for generating the reverse path. It has been
split off from SMC_Interpolator2Dir, and thus can be swapped to a lower-priority task in
the case of lower-performance automation systems that are being stretched to the limit.