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You know that the voltage of a load cell is relatively small... can I connect the load cell directly to a PLC??? or Shall I make an amplification stage ???
hi,
You will require to amplify a load cell signal before using it with a PIC.
A LC has an output in the order of 0 thru 10mV or 20mV at full load.
If you use the PIC's adc with the internal 5Vref, the LC signal will require 5000/10 = *500 gain for the max adc value.
What resolution in weight are you planning, also whats the max weight.?
Thanks alot for your reply .. but I'm using a PLC ( programmable Logic Controller ) not a PIC
hi,well, not an integrated ADC .. but I will use an ADC module .... it has 12 bit resolution ( values from 0 to 4095 ) .... the load cell's output is 2mv/v
No this is the output voltage per each volt of excitation voltage ... the cell weight range is from 0 to 100 kg
as I've told you before I'm planning to use an ADC module .... it has 12 bit resolution ( values from 0 to 4095 )
Which external ADC do you plan to use.?
the model is Al-1116 .... it's a product from ALTUS company
This is the website of the company:
www.altus.com.br
hi,
I have downloaded the datasheet.
I would suggest the 0 to +5V input option.
The LC output will require to be amplified from its 2mV/Vx upto 0 to +5V, also a ZERO and SPAN control pot for the amp.
Are you using all 8 input channels.?
Thanks Eric ... Why do I need to amplify the signal ? ... The LC output is from 0 to 2mv/vx this values are inside the range 0 to 5v
ok eric ... What type of amplifiers can be efficient to use with PLCs??
hi,
What are you weighing, what resolution and accuracy do you need.?
I'm weighing chickens ..... their weights may range between 800 and 1100 gm ....