How to read - analog signal in the PLC

PLC controller must have read the analog signal input module, the module is often said that the AI.

usually used analog such as pressure, temperature, humidity, flow rate and so on all need transmitter into current signal, or the voltage signal, current signal commonly used 4 - 1 to 20 ma, or the voltage signal 5 v, of course, there are other types.

after the analog signal is connected to the AI module, AI module through the AD converter converts analog signals into digital quantity, namely the SM331 in Siemens PLC controller system, 0 After 27648, different PLC into different Numbers.

shown above as the SM331 module, through the back four range selection module, can choose different signal types.

is above the corresponding analog module internal wiring diagram, and describe the information, the user can according to the figure for a variety of transmitter connection.

after completion of module selection and external connection is for PLC controller programming, AI module, data were collected into engineering value, namely the pressure, temperature, flow value.

when using Siemens STEP7 programming software, generally using a function block FC105, namely analog signal standardization program, its specific algorithm is as follows:

OUT = [( ( 浮动( 在) – K1） / ( K2–K1） ) ∗ ( HI_LIM–LO_LIM） ] + LO_LIM

parameter BIPOLAR = 1, the parameters IN the value of dual polarity, values range between - Between 27648 and 27648. The value of the constant 'K1' to '- 27648. 0 ', 'K2' has a value of '+ 27648. 0 '. Parameter BIPOLAR

= 0, the parameter IN the value of single polarity values range between 0 and 27648. The value of the constant 'K1' to '0. 0 ', 'K2' has a value of '+ 27648. 0 '.

the implications of the other parameters can refer to the above.

as the graph programming after AI signal standardization procedures, for parameters for the PIW IN value, LO_LIM and HI_LIM range for upper and lower, OUT for practical engineering value.

Over the years, has become very popular as more and more people are trying it out.
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