[?]: batch unit and plc show different Weight value 4-20 mA?

[kambiz]

Hello ,
i have a load cell after inside product to mixer Weight show in batch unit for exmaple 200 kg
and batch unit send 4-20 mA to plc s7-300 range batch unit and plc 0-15000 kg ,
my problem batch unit and plc show Different value
for example batch unit show 1024 kg and plc show 970 kg .

[Homeroid_BL]

You need to rescale analog signal, bnut only if weighing unit is calibrated first!

[kambiz]

please help me for scale analog signal

[kambiz]

4-20 ma analog from weight unit to plc and rang weight unit and plc is 0-15000

[kambiz]

hi thanks for answer
1- put a load on the load cell and current meter show below :
batch unit kg ---- ma---- plc kg
660- 4.70-640
958-5.06-930
1160-5.27-1123
1380-5.46-1335
1730-5.82-1700
2052-6.17-2031
2634-6.79-2612
3356-9.6-5123
6192-10.64-6162
6380-10.80-6357
7146-11.67-7125
7516-12.06-7493
8030-12.55-8002
8522-13.08-8494
10032-14.69-9997
11042-15.77-11003
11502-16.26-11497
12012-16.81-11994
2- clear load cell
2 kg show in load cell and 8 kg in plc and 4.04 ma current
thanks

[kambiz]

calculate in program plc cfc function fc275 (ch-AI) and mode 16#80010203 4-20 ma VHRANGE 15000 VLRANGE 0 .
thanks for answer .

[kambiz]

6ES7 331-1KF02-0AB0 AI8x13Bit
Measuring Type : i
Measuring Range: 4..20 ma

[sadoudkarim]

Good day,
what is happenning with sample 8?
is it happenning really or just a mistake in writting?
Best regards.


sample Weighting Scale Current PLC Dfference Diff.in %
1 660 4.7 640 20 3.03%
2 958 5.06 930 28 2.92%
3 1160 5.27 1123 37 3.19%
4 1380 5.46 1335 45 3.26%
5 1730 5.82 1700 30 1.73%
6 2052 6.17 2031 21 1.02%
7 2634 6.79 2612 22 0.84%
8 3356 9.6 5123 -1767 -52.65%
9 6192 10.64 6162 30 0.48%
10 6380 10.8 6357 23 0.36%
11 7146 11.67 7125 21 0.29%
12 7516 12.06 7493 23 0.31%
13 8030 12.55 8002 28 0.35%
14 8522 13.08 8494 28 0.33%
15 10032 14.69 9997 35 0.35%
16 11042 15.77 11003 39 0.35%
17 11502 16.26 11497 5 0.04%
18 12012 16.81 11994 18 0.15%