Siemens SIWAREX FTA - DR 7 - Process Value 1 for Fast Output to the SIMATIC CPU

Weighing Functions
SIWAREX FTA
5-79
5.6.4 DR 7 - Process value 1 for fast output to the SIMATIC CPU
The current process values can be read as data packages (data records in the
SIMATIC CPU using function block FB41. Transferring a large data record can last
for several CPU cycles and puts a load on system performance.
If a process value should be quickly transferred to the SIMATIC CPU immediately
after its creation in the SIWAREX FTA then the peripheral interface of the
SIWAREX FTA can be used. The data is read by the FB41 cyclically and provided
for the user as an output variable. In automatic scale operation, the current net
weight (Selection number 2) is normally important.
The selection is made from the following list.
Selection number
Process value
0
NAWI-Status
1
Gross weight (Process value)
2
Net weight (Process value)
3
Tare (process value)
4
Gross-/Net weight (calibratable numeral step)
5
Gross-/Net weight (calibratable numeral step x 10)
6
Tare (calibratable)
7
Pulse counter value
8
Temperature
9
Operating error (32 bit information)
10
Unfiltered ADC value
11
Filtered ADC value (for process value)
20
Through-put / sec
30
AWI status
31
Distribution memory 1
32
Distribution memory 2
33
Total number of weightings
34
Number of control weigh procedures
35
Number of weightings over TO2
36
Number of weightings over TO1
37
Number of weightings opt.
38
Number of weightings less than TU1
39
Number of weightings less than TU2
40
Number of weightings bad
41
Reserve
42
Set value
43
Actual weight average value
44
Standard deviation
45
Last actual weight
46
Weighing procedures per hour
47
Performance per hour
48
Current trailing weight
49
Current fine weight
50
Filtered ADC value (for coarse-, fine signal)
51
Remaining amount
52
Current load set value
Table 5-4 Selection list for process values