Lenze PLC Designer PLC-Designer (R2-x) SoftMotion - Manual (Page 273)

DMS 5.2 EN 03/2011 TD17
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273
L-force | PLC Designer - SoftMotion
SoftMotion programming examples
Cam drive control with the aid of a virtual time axis
3. The "Ipo" program is created in FBD and contains the calls of the program organisation
units below:
After the Power program organisation unit for the slave axis, the first program
organisation unit to be called will be TimeAxis. A period (fPeriod) of 10 seconds is specified
for this POU, as the cam is also configured for this time. The task cycle time must be
entered manually. TableSelect will select the required cam and CamIn will implement it.
The Tappet program organisation unit checks the position of the tappet. As the tappet has
been programmed "inverted", it will switch every 10 seconds.
The program can now be compiled and started on the control.
To check the set or actual position, create another visualisation, which you can use to check
the individual program organisation units and the position of the axes.
Please note that as well as being a virtual time axis, the cam master can also be any
AXIS_REF data structure. Setpoints are taken into account for drives that are being
controlled, with actual values being taken into account for drives that are not being
controlled.
PROGRAM Ipo
VAR
Power: MC_Power;
TimeAxis : SMC_TimeAxisFB;
TableSelect: MC_CamTableSelect := (SlaveAbsolute:=TRUE);
CamIn: MC_CamIn:=(StartMode:=ramp_in, VelocityDiff:=100, Acceleration:=100,
Deceleration:=100);
Tappet: SMC_GetTappetValue;
END_VAR