Analog range setting problem of Siemens step7 200
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For the analog range setting of Siemens step7 200, the setting is not a decimal number, only the constant and the base value are set. 6400~32000 corresponds to 4~20mA, use y=kx+b, k: constant, b: base value. If anyone knows more about these, please tell me!
I don’t know whether you are asking about analog input or output. 1. If it is input, then the PLC will automatically generate a data A of 6400-32000 in the input channel. Then you use A-6400/32000-6400 to generate data B, then B corresponds to a ratio of your analog input instrument range, for example, a purity of 0-1000PPM, you use B* (1000-0) will give you the purity value you want. 2. If it is an output, for example, a valve opening of 4-20mA corresponds to 0-100%, then if the opening you need is A, you can use A-0/(100-0) to get a B, and use B * (32000-6400) Get a C and then use C+6400 to get a data D. Just output D to the corresponding analog output channel to control the valve. Note, during the calculation process, pay attention to the conversion of the data format. I hope it can be of some help to you. 1# * aoshengzi1