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Device parameters and interfaces
8.1.7.22 Module 21: Speed parameters
Description
The speed parameter influences the fundamental method of operation and output of the
speed measurement. The resolution, scaling, integration depth and fault tolerance for the
speed measurement can be defined.
The resolution function defines the resolution for the speed value (module 20). The scaling
function allows the speed values to be converted to any unit of measurement. To do this, the
speed value (module 20) is multiplied by the scaling factor. The speed integration depth
parameter averages the selected number of speed values to produce the speed output in
module 20.
The speed tolerance time function is used to configure a time which results in an extended
output of the last speed (module 20) in the event of an error. If the speed could not be calcu-
lated momentarily, e.g. due to a brief interruption of the scanning beam, soiling of the bar
code tape or other short-term disturbances, the BPS transmits the last valid speed. If the
error disappears within the configured time, the control notices nothing or only a small
change in the speed value. The availability of the system is thereby ensured.
The "delay speed error output" parameter can be used to signal a speed error with bit 0.0
either immediately or after the speed tolerance time in module 23 has elapsed. If the error
persists after the tolerance time has elapsed, a speed value of zero is output.
Parameters
Parameter
Description
a
Speed res-
The parameter specifies the
resolution for the speed value.
olution in
[mm/s]
b
Speed
Scaling factor used to convert
scaling
the speed
factor in
[‰]
c
Number of consecutive mea-
surements which are to be
Speed inte-
used for speed determination.
gration
Specified here is the response
depth
time (see table on Page 81).
d
Speed tol-
Specifies the time for the dis-
erance
play of the last speed following
an error.
time in
[ms]
e
Delays the output of a speed
Delay
error by the configured toler-
speed error
ance time.
output
Parameter length: 7 byte
80
Rel.
Data
Value range
addr.
type
3: 1
unsign
4: 10
0
8
5: 100
6: 1,000
unsign
1
0 ... 65,535
16
unsign
3
2 ... 128
8
unsign
4
0 ... 65,535
16
unsign
0: No, error delay deactivated
6
8
1: Yes, error delay activated
BPS 34
Default
Unit
CR to
module
3
mm/s
Per thou-
1,000
sand
20a
8
ms
50
ms
1
–
23a
Leuze electronic
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