Motion control C3F_T40
288 192-121102 N04 June 2008
5.11 Cam switching mechanism
In this chapter you can read about:
Cam switching mechanism function overview..................................................................288
Redirect the fast cams directly to the physical output (C3_OutputSelect) .......................291
Objects of the cam switching mechanism ........................................................................292
Behavior of the switch-on/switch-off anticipation..............................................................293
Hysteresis.........................................................................................................................296
CoDeSys-Project for the configura
tion of the cams .........................................................297
Example: Working with fast cams ....................................................................................298
In the C3 powerPLmC, the "cam switching mechanism" function can only be
programmed for a Compax3 slave axis with the T40 technology function.
5.11.1. Cam switching mechanism function overview
In this chapter you can read about:
Example of cam function ..................................................................................................289
Examples of a cam cycle..................................................................................................289
Up to 36 cams can be programmed. They are divided into 2 cam types:
Serial cams
32 serial cams (Cam 0 ... 31) of which a cam is brought up once every 0.5 ms.
The
cycle timeof the cams is: ((Highest active serial cam +1) * 0.5ms..
Example: if cam 17 is the highest cam enabled, this results in a cycle time of: 18 *
0.5ms = 9ms
If no fast cams are used, the numberof the serial cams per cycle (0.5ms) can be
increased up to 4:
The setting is made via object 3701.6. It applies:
Cycle time = number of the serial cams *0.5ms / O3701.6 with the value range
O3701.6 = 1, 2, 3, 4.
Fast cams
4 fast cams with a cycle time of 500µs (125µs per cam).
When using fast cams, there is a cycle time of 0.5ms per cam for serial cams.
With the C3_OutputSelect (see page 291) module the fast cams can be put
directly and without delay, independently of the cycle time of the IEC program, on
the digital outputs O0 ...O3.
Cam functions
Switching-on and switching-off position of each cam individually.
Cams with compensation for dead time, with switching-on and switching-off
anticipation for each cam.
Individually adjustable cam source.
Enable for each individual cam.
Adjustable switching hysteresis for actual position value as a cam source.
The outputs of the cams are objects.
Please observe:
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