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4. Concepts of the cam disc
53
Festo.P.BE-CMMP-CAM-SW-EN en 1105a
4.12
Position comparison between master and slave
4.12.1
With physical master
Only
incremental signals
are transmitted via the master-slave connection. A position
comparison between master and slave must therefore be carried out after switch-on. This
can occur as follows:
–
The master travels at the beginning to its defined start position (e.g. X=0).
–
For the slave, it was specified in FCT that the master setpoint value should be set to
“0” when a cam disc is activated. And so, after activation of the cam disc in the slave,
both the real position of the master and the specified position for the slave are at
position 0.
The slave might execute a CAM-IN movement (see section 4.12.3).
4.12.2
For the virtual master
During activation of a cam disc, the master position is set to X=0 or to the parametrised
start value for this cam disc.
The connected axis travels with the defined CAM-IN values to the Y-position assigned to
this start position according to the cam disc.
Example:
The drive is at position X=5. When the cam disc is activated, the position is set to X=4,
since this was specified in the cam disc as the starting value (= master start position, see
section 4.8).
Subsequently, the connected axis moves with CAM-IN velocity to Y=1.
After completion of the CAM-IN movement, positioning records from the positioning record
table can be executed “virtually”. The connected axis travels the path according to the
active cam disc.