Analog output

LOGO! functions

4.4 Special functions list - SF

Gain and offset parameters

Please note the information on gain and offset parameters in topic Calculating the gain and offset of analog values (Page 154).

Parameter p (number of decimals)

Applies only to the AQ value in a message text.

Functional description

The function fetches the analog signal of input Ax.

This value is multiplied by the value of the A (gain) parameter, and parameter B (offset) is then added to the product: (Ax • gain) + offset = actual value Ax.

The actual value Ax is output at AQ.

If you interconnect this special function with a real analog output, note that the analog output can only process values between 0 and 1000. To do this, you may need to connect an additional amplifier between the analog output of the special function and the real analog output. Using this amplifier, you standardize the output range of the special function to a value range of 0 to 1000.

Scaling an analog input value

You can influence the analog input value of a potentiometer by interconnecting an analog input with an analog amplifier and an analog flag.

●Scale the analog value at the analog amplifier for further use.

●Connect, for example, the time base for parameter T of a time function (e.g. On-/Off-delay(Page 166)) or the on and/or off limit specification of an up/down counter (Page 201) to the scaled analog value.

For more information with programming examples refer to the online help for LOGO!Soft Comfort.

Setting the Par parameter

The gain and offset parameters are used to adapt the sensors to the relevant application. View in programming mode (example):

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LOGO!
Manual, 04/2011, A5E03556174-01	227

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Siemens 6ED1050-1AA00-0BE8 manual Analog output, Scaling an analog input value

Models: 6ED1050-1AA00-0BE8