Potentiometer (Mlo - Festo CPX-CMIX-M1-1 Manual

3. Commissioning
3.4.3 Potentiometer (MLO-..., DSMI)
3-12
At initial commissioning, the min. and max. position value
must be set once and the effective stroke length (maximum
measurement length) written in 1/100 mm or 1/100°.
If no effective stroke length is written, 100 mm or 100° is
used as default setting.
The values remain stored after switching on and off. If the
existing potentiometer is replaced by one with another
length, the initial commissioning must be carried out again.
Proceed as follows:
1. For definition of the min. and max. position values, the
measuring system (potentiometer) must be pushed
successively into the stroke-limiting mechanical stops of
the drive or run with compressed air. To accept the
positions, the following bits are set in the control byte
CCON:
Min. position:
} Accept with LOAD_P = 1
Max. position: PARAM0 = 0 and PARAM1 = 1
} Accept with LOAD_P = 1
With the bit ACK (bit 5), the process is acknowledged with
a 1-signal each.
2. If the actual position should be output in millimetres or the
speed in millimetres/second (or correspondingly in de-
grees, etc.), the effective stroke length must be measured
and input in 1/100 mm or 1/100°. This requires setting the
bit UNIT in the control byte CCON to 1 (Z 1/100 mm).
Measuring errors in the input have a negative effect on the
maximum achievable accuracy.
This applies especially for the swivel modules, for which the
scale used by its nature does not permit measurement in
1/100°. That is, an entry of 27000 (32-bit integer) or 270.00
(decimal) equals the nominal swivel angle of 270°. But the
exact angle between the stops can differ from it.
PARAM0 = 1 and PARAM1 = 0
Festo P.BE-CPX-CMIX-EN en 1208a