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
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PLC Analog Input Sampling Ladder Logic
Design an efficient PLC ladder logic program that samples analog input (I:1.0) at the rate of 2Hz and outputs the average value to analog output O:1.0 once every two seconds. PLC