● 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.
● Time-based cam with maximum ON length
A maximum ON length can be defined for time-based cams. This means that the time-based
cam is deactivated once it has covered the maximum length, even though the
parameterized time has not yet expired.
● High-speed/accurate output cam (hardware-based output cam)
Although output cams are usually output in IPO cycles or the servo cycles, high-speed
output cams achieve output accuracy that is better than the servo cycle clock because the
switching edges are output within servo cycles.
4.1.2
Functionality
Cam track functionality
● Cam tracks allow up to 32 output cams to be configured within one TO and allow, for
example, the switching point for all output cams to be shifted collectively.
● The switching of several output cams is dependent on the same setpoint/actual value, and
they are output on one output.
● Any number of cam tracks can be used per axis. The only restriction placed on this number
is the system performance.
● The cam track can be calculated in servo cycles, IPO cycles, or IPO_2 cycles.
● All output cams on one track are of the same type (position or time-based cams).
● Cam tracks can be activated once or cyclically.
● Various modes are available for activating and deactivating cam tracks, e.g. active
immediately, next track cycle, etc.
● Cam track output can be inverted.
● The status of each single output cam (controlled/not controlled) can be read over one array
of byte.
● Single output cams on a cam track can also be defined as valid/invalid.
● In connection with the TM17 High Feature terminal module, the cam track output can be
controlled via a high-speed hardware enabling signal.
Reference to axis
The reference values of the cam track depend on the axis type or the external encoder:
Cam Track TO - Part II
4.1 Overview of TO Cam Track
Output Cams and Measuring Inputs
62
Function Manual, 04/2014