A typical scaling system includes one or more load cells, a summing board if more than one load cell, and a controller to convert the load signal to an engineering unit. I am wondering if I cannot build a scale where the load cells connect directly to PLC analog inputs. A simple routine would take care of all of the signal processing, calibration, fault monitoring, and any other needs. I am well versed on the functionality of the scaling equipment. I see this design as a way to eliminate not only a summing board and scale controller but also eliminate communication traffic of the scale values to our SCADA system. I am certain that it will work, and I'm certain it won't meet the 'legal for trade' requirement, but I should be able to use it everywhere else.
Does anyone have experience with this and if so, what are the do's and don'ts?
The more you know, the more you know you don't know.
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