Functional description
MSA501
Date: 12.10.2018
Art. No. 88734
Mod. status 330/18
Page 9 of 51
Fig. 3: Position value
Variable boundary:
In case the measurement range is to be extended in negative direction, there exists the
possibility of programming a positive value as a boundary via interface,
e.g.: Boundary = 6000 mm (measurement range = -4240 mm ... +6000 mm;
-4240 mm / 0.005 mm = 848000; +6000 mm / 0.005 mm = +1200000)
Fig. 4: Variable boundary:
Counting direction:
The sensor delivers ascending numerical values when the sensor is moved in the plug outlet
direction. This feature can be changed via object
numerical values when the sensor is moved in the plug outlet direction).
4.2
Calibration
The MSA501 features an absolute measurement system, i.e. the information of the position
value is represented in the scale (MBA501 magnetic tape) as an absolute value. Calibration
can be performed at any position on the magnetic tape.
Position value = measured value + calibration value
The measured value is set to zero when calibrating.
At the actual sensor position, the value “position value = 0 + calibration value” is output from
then on. With calibration, the actual position value is replaced by the set calibration value
and stored non-volatilely.
Two steps are required for executing calibration:
1.
Write calibration value (see
Object
6003h: Preset value (Calibration value)
)
2.
Execute calibration (reset) (see object
5115h: Calibrate encoder value
The following equation is applied in case of calibration:
Position value = 0 + calibration value
-480000
0
+1
-1
-1
+1
0
-480000
+1999999
-848000
0
+1
-1
-1
+1
0
-848000
+1199999
