Siemens SINUMERIK 840D sl Function Manual page 695

Linear axes
The switching edges of the cam signals are generated as a function of the axis traversing
direction:
● The minus cam signal switches from 1 to 0 when the axis traverses the minus cam in the
● The plus cam signal switches from 0 to 1 when the axis traverses the plus cam in the
Figure 9-1
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
positive axis direction.
positive direction.
Software cams for linear axis (minus cam < plus cam)
Note
Position switching signals:
If the axis is positioned exactly on the cam (plus or minus), the defined output flickers.
If the axis moves one increment further, the output becomes a definite zero or one.
Flickering of the actual position causes the signals to flicker in this manner.
The actual position is evaluated.
N3: Software cams, position switching cycles - only 840D sl
9.2 Cam signals and cam positions
695