User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 06/2014, A5E33039675
195
4.4.22
Analog amplifier
Short description
This special function amplifies the value of an analog input and outputs the result at an
analog output.
Symbol in LOGO!
Wiring
Description
Input Ax Input Ax is one of the following analog signals:
• AI1 to AI8 (*)
• AM1 to AM64
• NAI1 to NAI32
• AQ1 to AQ8
• NAQ1 to NAQ16
• Block number of a function with analog output
Parameter A: gain
Range of values: -10.00 to 10.00
B: zero offset
Range of values: -10,000 to 10,000
p: number of decimals
Range of values: 0, 1, 2, 3
Output AQ This special function has an analog output. This
output can only be connected with analog inputs,
analog flags, analog outputs or network analog
outputs.
Range of values for AQ:
-32767 to 32767
* AI1...AI8: 0 V to 10 V corresponds with 0 to 1000 (internal value).
Gain and offset parameters
Please note the information on gain and offset parameters in topic Calculating the gain and
offset of analog values (Page 130).
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.