Technical data

Technology objects
CPU 317T: Technology Functions
A5E00251798-03
3-23
Acyclic or cyclic cam disk mode
At input parameter CyclicMode of the technology function for cam synchronization,
you can set acyclic (CyclicMode = 0) or cyclic (CyclicMode = 1) mode.
• Acyclic mode means, that the cam disk is executed once only. Synchronism is
terminated when the cam disk has reached its end position. Example:
(x = control value; y = slave value)
• In cyclic cam disk mode, the leading axis are calculate as modulo to the cam
disk length. As with gearing, the coupling can be terminated by programming
an abort. Example:
(x = control value; y = slave value)
Absolute and relative camming
The input parameters MasterAbsolute and SlaveAbsolute of the technology
function "MC_CamIn" can be used to set absolute or relative camming.
• When absolute camming is set, the control values based on the cam disk
domain, and the slave values based on the range of values of the cam disk,
are interpreted as being absolute.
The system compensates any offset developing between the leading and
following axis during synchronization. When synchronism is reached, a defined
phase relationship is established between the control value and the slave
value.
For absolute camming, the start and end values of the modulo axes should be
identical, because otherwise unwanted step jumps may occur.
• When relative camming is set, the cam disk is tracked starting at the start
value of camming.
This means that any offsets between the control value and the slave value are
not compensated for during synchronization.
The absolute and relative synchronism settings available are shown below.