How a PLC do the Scaling for a Sensor ?
I am always surprised how a automation system like PLC or DCS do the scaling for a sensor ? or even sometimes thinking about a simple field transmitter scaling techniques...
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PLC Analog Input Scaling
An Allen-Bradley SLC500 programmable logic controller (PLC) uses a 16-bit analog-to-digital converter ( in its model 1746-NI4 ) in analog input card to convert 4-20 mA signals into digital number...