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Connecting load cells must be done with the right material :
a load cell is basically an high precision resistor.
So a Δ wheight gives a Δ resistor. You can measure this with a millivoltmeter.
Of course the wiring of your loadcell to your plc as a direct influence on your
measure.
If you really want o use a S7-200 try to find a module that convert the measure of the
wheight to a 4-20 mA signal which is easier to handle with a PLC.
Try Metler Toledo they are specialists on the wheighing field you ll maybe find such
module
In fact S7-200 is low range PLC of Siemens. You could find certainly more accuracy
on S7-300/400. So is Profibus a standard on the industry, you may find an interface
that can handle the connection with the load cell and give the result as a profibus slave.
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