B.1 Cmax System Of Measurement Units - Festo CPX Series Manual

B. Basic controlling principles
B.1 CMAX system of measurement units
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
The CMAX can either be operated in the metric (SI) or in the
imperial system of measurement units.
The system of measurement units needs to be defined in
delivery status (after switching on for the first time or after
data reset, status C00). The configuration of the drive type
(in status C01) determines whether a translatory or a rotatory
system of units will be used (refer to Appendix A.1.2,
Fig. A/1).
After the system of measurement units has been configured,
the parameters are set accordingly, e. g. the actual configur
ation is scaled in user units and default values are defined.
Only then can the parameters be accessed.
The units thus defined are used for all numerical values, also
for the primary setpoints and actual values in the I/E data.
Once the system of measurement units has been defined, it
cannot be changed. The CMAX does convert values from one
system of units to the other. To change the system of
measurement units, the axis data must be reset and commis
sioning must be restarted in status C00.
The CMAX uses 12 physical variables. For each variable, the
physical unit and the scaling is predefined.
For each possible physical unit a type is defined that stands
for the unit. Position values (index 1) can, for example, be
given in millimetres (type 10), in inches (type 11), or in de
grees (type 15), see Tab. B/1.
The scaling describes the number of decimal places, and
consequently the precision of the respective integer value.
Here the exponent of 10 is given. A specification of −3 for scal
ing results in a factor of 1/1000 (=10
Hence for each physical variable, a table with 12 entries for
the unit and the scaling can be given.
−3
).
B−3