User guide

3. Drive functions
3−68
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
3.4 Direct operating mode (direct mode)
In the Operation enabled" state (direct mode), a positioning
task is formulated directly in the I/O data, which is trans
mitted by the CPX node (e.g. via the fieldbus). The setpoint
values are reserved in the PLC here.
Typical applications
The function is used in the following situations:
 Moving to any position within the
effective stroke.
 The target positions are unknown during designing or
change frequently (e.g. several different workpiece posi
tions).
A traversing profile consisting of chaining records is not
necessary.
 The drive is to continuously follow a setpoint value.
 The position setpoints should be reserved in the PLC for
another reason.
Typical causes of error in applications
No referencing carried out.
 Target position or target force cannot be reached or are
outside of the software end positions.
 Timeout (target position or target force are not reached).