A range of output cam types with different switching behaviors are available.
● Position-based cam
The switching signal is supplied between the switch-on position and the switch-off position.
● Time-based cam
The switching signal is supplied for a specified time period after the switch-on position is
reached.
● Unidirectional output cam
The switching signal is supplied when the axis reaches the switching position and is then
reset by the user.
● Counter cam
Counter cams are not a separate output cam type, but rather position-based or time-based
type cams. Counter cams can be configured so that they are output for every switching or
for every nth switching. They can only be programmed and activated in the user program.
● Cam output types
While output cams are usually output in the IPO cycle clock or the position control cycle
clock, high-speed output cams provide better output accuracy than the position control
cycle clock because the switching edges are positioned within the position control cycle
clock.
3.1.2
Functionality
It is possible to define an effective direction for the Output Cam TO, i.e. the output cam is only
active when the direction of motion of the axis is the same as the effective direction.
The output cam can be calculated in servo cycles, IPO cycles, or IPO_2 cycles.
Note
With modules D435-2 DP/PN, D445-2 DP/PN, and D455-2 DP/PN, cam calculation can be
performed in Servo_fast or IPO_fast. For more information, see the chapter Second servo
cycle clock (Servo_fast) in the Motion Control Basic Functions manual.
The reference values of the output cam depend on the axis type or the external encoder:
Table 3-1
Reference to the actual or set position
Technology object
Reference to actual position
possible
Reference to set position possible
Real drive axis
-
-
Real position axis
X
X
Real synchronized axis
X
X
Virtual axes
-
X
External encoder
X
-
Possible configuration of the cams with actual value reference:
Output Cam TO - Part I
3.1 Overview of Output Cam TO
Output Cams and Measuring Inputs
14
Function Manual, 04/2014