read data (measure weight) from a SIWAREX WL250 load cell

Dear All, My task is to read data (measure weight) from a SIWAREX WL250 load cell which has an output of 3.0029 mV/V and recommended reference voltage 5...12V DC.

I am using a power supply of 24V and an ET200 SP with a CPU 1512SP-1PN and an AI module AI 2xSG-4-/6wire HS which has a measuring range from +/- 0.5 ... 320 mV/V and is designed for load cell systems as far as I read from the manual, also it says it has a 28 bit (normal/isochronous mode), 16 bits (oversampling)

. I have the load cell connected to the AI module.

I am trying to normalize the value with NORM_X Block with MIN 0 to 27648 and then trying to scale it SCALE_X from 0-1000 (which is the maximum load of the load cell), but I am not getting real data and it is important to mention that I am getting 5/6 as an offset when there is no load applied to the sensor (load cell).

I want to know if I should use an amplifier even though it does not make sense to use an amplifier when my analog module is specifically made for load cell measurements.

Am I using the correct value (27648) for the NORM_X? Can you tell me if I am using the correct measuring system for the load cell and more about how I can get the correct value according to the weight I put on it?

Thank you in advance.

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Split from load cell representation.

Siwarexi

Hello amrelhajali,

load cell with 5 v and 2mv/v output "30kg" so at full load will produce 10 mv
=> YES

inside tia 10 mv will convert to what ? is it 27648 too ?
=> Normally a load cell is not connected to an analogue input module, but to a Siwarex module.
With a Siwarex module you can do a calibration of the scale, … .

and at no load is it produce ~ 0 mv ?
=> YES

and what is c3 c4 ...?
=> C3 means:
You can use as a resolution for a scale for legal-for-trade scale 3000 parts of your weighing range.
E.g.:
- Weighing range = 30 kg
- C3 = 3000 parts
Allowed resolution of the scale = 30000 gr / 3000 = 10 gr.

Best regards

Siwarexi

Dear All, My task is to read data (measure weight) from a SIWAREX WL250 load cell which has an output of 3.0029 mV/V and recommended reference voltage 5...12V DC.

I am using a power supply of 24V and an ET200 SP with a CPU 1512SP-1PN and an AI module AI 2xSG-4-/6wire HS which has a measuring range from +/- 0.5 ... 320 mV/V and is designed for load cell systems as far as I read from the manual, also it says it has a 28 bit (normal/isochronous mode), 16 bits (oversampling)

. I have the load cell connected to the AI module.

I am trying to normalize the value with NORM_X Block with MIN 0 to 27648 and then trying to scale it SCALE_X from 0-1000 (which is the maximum load of the load cell), but I am not getting real data and it is important to mention that I am getting 5/6 as an offset when there is no load applied to the sensor (load cell).

I want to know if I should use an amplifier even though it does not make sense to use an amplifier when my analog module is specifically made for load cell measurements.

Am I using the correct value (27648) for the NORM_X? Can you tell me if I am using the correct measuring system for the load cell and more about how I can get the correct value according to the weight I put on it?

Thank you in advance.

Closed cause question posted twice.

The second thread with the subject How to read analog values from SIWAREX Load cell WL250 with module AI 2xSG 4-6wire HS is published within the conference Process Instrumentation / Analytics / Weighing Systems SIWAREX.

Best regards,
Jen_Moderator
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