Siemens 6ED1050-1AA00-0BE8 User Manual

 

LOGO! functions 

 

4.4 Special functions list - SF 

LOGO! 
Manual, 04/2011, A5E03556174-01 

265

 

4.4.32 

Mathematic instruction 

Short description 

The mathematic instruction block calculates the value AQ of an equation formed from the 

user-defined operands and operators.    

 

Symbol in LOGO! 

Wiring 

Description 

Input En 

A change in the status from 0 to 1 at input En 

(Enable) enables the mathematic instruction function 

block. 

Parameter 

V1: First operand value 

V2: Second operand value 

V3: Third operand value 

V4: Fourth operand value 

 

Op1:  First operator 

Op2:  Second operator 

Op3:  Third operator 

 

Pr1:  Priority of first operation 

Pr2:  Priority of second operation 

Pr3:  Priority of third operation 

 

Qen→0: 0: Reset value of AQ to 0 when En=0 

 1: Retain last value of AQ when En=0 

p: Number of decimals 

 Range of values: 0, 1, 2, 3 

 

$ᇄ

$4

(Q
3DU

 

Output AQ 

The output AQ is the result of the equation formed 

from the operand values and operators. AQ will be 

set to 32767 if a divide by 0 or overflow occurs, and -

32768 if a negative overflow (underflow) occurs. 

Parameters V1...V4 

The analog values for the parameters V1...V4 can be derived from another already-

programmed function. You can use the actual values of the following functions:  
●  Analog comparator (Page 218) (actual value Ax – Ay) 
●  Analog threshold trigger (Page 213) (actual value Ax) 
●  Analog amplifier (Page 226) (actual value Ax) 
●  Analog multiplexer (Page 248) (actual value AQ) 
●  Analog Ramp (Page 251) (actual value AQ) 
●  PI controller (Page 256) (actual value AQ) 
●  Up/down counter (Page 201) (actual value Cnt)