User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 06/2014, A5E33039675
213
4.4.28
Analog multiplexer
Short description
This special function outputs one of four predefined analog values or 0 at the analog output.
Symbol in LOGO!
Wiring
Description
Input En A change in status from 0 to 1 at input En (Enable)
switches a parameterized analog value to the output
AQ, depending on the value of S1 and S2.
Inputs S1 and S2 S1 and S2 (selectors) for selecting the analog value
to be issued.
• S1 = 0 and S2 = 0:
value 1 is issued.
• S1 = 0 and S2 = 1:
value 2 is issued.
• S1 = 1 and S2 = 0:
value 3 is issued.
• S1 = 1 and S2 = 1:
value 4 is issued.
Parameter V1 to V4: analog values that will be issued.
Range of values: -32768 to 32767
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:
-32768 to 32767
Parameters V1...V4
The analog values for the parameters V1to V4 can be derived from another already-
programmed function. You can use the actual values of the following functions:
● Analog comparator (Page 188) (actual value Ax – Ay)
● Analog threshold trigger (Page 183) (actual value Ax)
● Analog amplifier (Page 195) (actual value Ax)
● Analog ramp (Page 216) (actual value AQ)
● Mathematic instruction (Page 227) (actual value AQ)
● PI controller (Page 220) (actual value AQ)
● Up/down counter (Page 173) (actual value Cnt)
● Analog multiplexer (actual value AQ)
● Analog filter (Page 232) (actual value AQ)