Menu 1.5 Communication & Interfaces - Siemens SIWAREX WT241 Manual

Scale parameters and functions of the belt scale
8.7 Menu 1.5 Communication & interfaces
Frequency „Belt
speed" low pass
filter (Hz)
Order number „Belt
speed" low pass
filter
Average filter „Flow
rate" (samples)
1.4.5 Belt commands
8.7 Menu 1.5 Communication & interfaces
1.5.1 Digital in- and outputs
Input DI.0 ... DI.3
Filter digital inputs
Output DQ.0 ...
DQ.3
68
Cutoff frequency of low pass filter for belt speed
Set "0" to switch off the filter.
can range between 0.05...50 Hz.
Cutoff frequency f
g
The number of the filter defines the effect of damping. The values 2, 4,
6, 8, and 10 can be set. The higher the selected order number, the
higher the damping effect of the filter.
The mean value filter is used to steady the weight against random inter-
ference. The weight is generated from the mean value of n (n = max.
250) weight values calculated by the weighing module every 10 ms.
With n = 10, for example, 10 values are used to generate the mean val-
ue. The oldest value is discarded every 10 ms, and the newest value
included in the calculation.
In case of working without speed sensor but using a known belt speed, the
command „Belt is running" must be setted in order to operate the scale.
(see 7.3.2.1 „Specification of a known, constant belt speed", pg. 48)
Parameterize the digital in- and outputs
Assign commands to digital input 0 to 3. The commands will be trig-
gered with rising edge (0 -> transition).
Consider that DI.0 is used for speed sensor input.
Refer to chapter 10 "Command lists" page 83 for a list of possible com-
mands.
To ensure that the inputs do not respond too quickly to the signal
change, a minimum signal pending time can be specified. The pending
signal is not processed further until this time has elapsed..
The following values can be set:
– 0,2 ms
– 0,4 ms
– 0,8 ms
– 1,6 ms
– 3,2 ms
– 6,4 ms
– 12,8 ms
A status display can be assigned to a digital input. This is done on the
basis of chosing the status out of the drop down menu.
SIWAREX WT241
Manual, 05/2015, A5E36046748A