EXAMPLE OF APPLICATION
Using the approach proposed in this paper a classical object in the
packaging machinery is solved: the control of one axis. The axis has
the following sensors connected to the PLC: a position sensor and
two digital limit switches. Moreover, two digital signal are used in
order to start and stop the axis movement. On the other hand it has
another analog signal to indicate the desired final position of the axis,
i.e. to indicate which movement must do the axis. As outputs it has 4
digital outputs, once for start the movement, twice to indicate the
direction (forward or reverse). The last one is for changing the speed,
when the axis is close to the desired speed the motor moves slowly
increasing the precision.