Siemens SIMOTION Function Manual page 80

Cam Track TO - Part II
4.2 TO Cam Track basics
Figure 4-13
Note
The time of output for the output cam in the controller is relevant for calculation of the dynamic
adjustment. If velocity changes up to signal output, these changes are no longer taken into
account.
Dead times, e.g. PROFIBUS DP communication times, output delay times on digital outputs,
etc., are taken into account in the actuation time.
Long actuation times exceeding one modulo cycle may lead to heavy fluctuation of the
switching position of actual value output cams (actual value curve). Here, setpoint output
cams should be used or the actuation time should be considerably less than one modulo
cycle.
The system takes into account the specified actuation times when the output cams are
calculated and managed. The switching positions of the output cams are calculated taking into
account the activation time and deactivation time in relation to the present velocity. If, allowing
for actuation times, the output cam was switched, then the system deems this operation to
have occurred, and it does not switch the output cam again even if any subsequent current
velocity changes occur.
The dynamic actuation of modulo axes can be greater than one modulo length. However, the
number of switching operations is not collected by the system, i.e. for actuation times longer
than one modulo length, a switching operation cannot take place in each modulo cycle. One
switching operation is active in the system at any given point in time. A switching operation is
completed when the output cam is switched off.
Actuation times and cycle clock settings
A change of cycle clock settings does not have to be taken into account for the actuation time
settings (activation/deactivation time). These are, for example:
80
Switching behavior at varying actuation times
Output Cams and Measuring Inputs
Function Manual, 04/2014