![Festo CMMP-AS Скачать руководство пользователя страница 20](http://html1.mh-extra.com/html/festo/cmmp-as/cmmp-as_manual_2283115020.webp)
4. Concepts of the cam disc
20
Festo.P.BE-CMMP-CAM-SW-EN en 1105a
4.4
Virtual master
A “virtual” master runs as software on a CMMP-AS that was configured accordingly. As a
result, this CMMP-AS is simultaneously master and slave.
The master carries out positioning jobs (e.g. positioning records from the positioning
record table) only “virtually”, i.e. it calculates positioning runs to target positions using the
parametrised accelerations and speeds. The virtual execution of a positioning job lasts
exactly as long as if the connected drive would actually perform the positioning job. But
the drive travels the path according to the active cam disc.
Example:
1.
When the cam disc is activated, the virtual master is at position “0”
(= parametrised master start position). The connected drive (slave) then performs a
CAM-IN movement (see section 4.12.3) to position 4.
2.
If only one positioning job containing “4” as the target position is started, the virtual
master “travels” from position 0 to position 4.
3.
But the drive (slave) connected to this CMMP-AS travels the path according to the
active cam disc, and so in the figure a curve from position 4 to position 1.
It therefore is a “stand-alone” cam disc application, since the CMMP-AS here is master and
slave in one.
The “virtual master” is activated in the FCT plug-in:
The virtual master is controlled by record selection or direct
operation. In the case of direct operation, only the positioning
mode is possible. Force mode and speed-regulated operation are
not possible.