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).
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