PLC how to read - analog data

the basic unit of PLC can't be directly read analog data, itself has no analog input interface must by extending the AD module to be read. The role of the AD module is to convert analog to digital quantity, then the PLC controller through to read digital quantity, you will know the size of the analog. The conversion between them like the image below the curve of the relationship, usually linear transformation relations.

the commonly used analog signals are: voltage signal, 0 - 10v，- 10 - 10 v, etc. ) , the current signal, 0 - 20ma，4- 10 ma, etc. ) , these input features we can directly in the AD module view in the manual. Analog often ACTS as a middle bridge between PLC and sensor, the relationship between the practical application of what we need the actual quantity, such as the frequency of the inverter, size, pressure, temperature, such as signal, analog quantity and quantity conversion relations still exist, such as 0 50 hz range, 0 0. 5 mpa range. So in PLC controller programming read analog is to get the actual quantity, simulation quantity just intermediate variable. Know the relationship, after the AD module converts digital quantity according to the range of linear relationship, we knew that the value of quantities.

PLC analog by read is AD module to complete.

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