Siemens S7-300 Operating Instructions Manual page 17

Inverse cam
An inverse cam comes about if the cam start is greater than the cam end. The following table
shows the effect of an inverse cam with a linear axis and a rotary axis.
Inverse cam with a linear axis
The cam start (NA) is greater than the cam end
(NE).
With both types of axes there must always be an interval of at least 4 pulses between the cam start
and the cam end.
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
3.1 Properties of the cam types
Inverse cam with a rotary axis
The cam start (NA) is more positive than the cam
end (NE).
Cam control basics
17