Device parameters and interfaces
Leuze
electronic
78
BPS 34
Leuze electronic
8.1.7.22 Module 21: Velocity parameters
Description
The velocity parameter influences the fundamental method of operation and output of the
velocity measurement. The resolution, scaling, integration depth and error tolerance for the
velocity measurement can be defined.
The resolution function defines the resolution for the velocity value (module 20). The scaling
function allows the velocity values to be converted to any unit of measurement. To do this,
the velocity value (module 20) is multiplied by the scaling factor. The velocity integration
depth parameter averages the selected number of velocity values to produce the velocity
output in module 20.
The velocity tolerance time function is used to configure a time which results in an extended
output of the last velocity (module 20) in the event of an error. If the speed could not be
calculated momentarily, e.g. due to a brief interruption of the scanning beam, soiling of the
barcode tape or other short-term disturbances, the BPS transmits the last valid velocity. If
the error disappears within the configured time, the control notices nothing or only a small
change in the velocity value. The availability of the system is thereby ensured.
The "delay velocity error output" parameter can be used to signal a velocity error with bit 0.0
either immediately or after the velocity tolerance time in module 23 has elapsed. If the error
persists after the tolerance time has elapsed, a velocity value of zero is output.
Parameter
Parameter
Description
Rel.
addr.
Data
type
Value range
Default
Unit
CR to
module
Velocity res-
olution in
[mm/s]
The parameter specifies the
resolution for the velocity value.
0
unsign
8
3: 1
4: 10
5: 100
6: 1’000
3
mm/s
20a
Velocity
scaling
factor in [‰]
Scaling factor used to convert
the velocity
1
unsign
16
0 … 65’535
1’000
Per
thou-
sand
Velocity
integration
depth
Number of consecutive meas-
urements which are to be used
for velocity determination.
Specified here is the integra-
tion time (see table on
page 79).
3
unsign
8
2 … 128
8
ms
Velocity tol-
erance time
in [ms]
Specifies the time for the dis-
play of the last velocity follow-
ing an error
4
unsign
16
0 … 65’535
50
ms
Delay veloc-
ity error out-
put
Delays the output of a velocity
error by the configured toler-
ance time.
6
unsign
8
0: No, error delay deactivated
1: Yes, error delay activated
1
–
23a
Parameter length: 7 bytes
a
b
c
d
e
