Operating Modes - Festo CPX Series Manual

2. I/O data and sequence control
2.1

Operating modes

2.1.1 Record select mode
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
The operating modes differ with regard to their content and
the meaning of the cyclic I/O data and with regard to the
functions which can be accessed in the CMAX.
The CMAX has over 64 records which contain all the necess
ary information for a positioning task.
The record number that the CMAX is to process at the next
start is transferred in the PLC's output data. The input data
contains the record number that was processed last.
The CMAX does not support any user program. Records can
not be processed automatically with programmable logic.
The CMAX can therefore not handle any reasonable jobs as a
stand−alone device.
However, it is also possible to link various records and ex
ecute them one after the other with the help of a start com
mand. It is also possible to define a record switch before the
target position is reached.
In this way, positioning profiles can be created without the
inactive times (which arise from the transfer in the fieldbus
and the PLC's cycle time) having an effect.
Detailed information on record select mode can be found
in section 3.3. An overview of the I/O data can be found in
section 2.2.3.
2−3