LOGO! functions

4.4 Special functions list - SF

4.4.32Mathematic 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

(Q

 



 

 

 

(Enable) enables the mathematic instruction function

 

$ᇄ

 

$4

 

block.

3DU

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

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)

LOGO!

 

Manual, 04/2011, A5E03556174-01

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Page 264 Page 266
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Siemens 6ED1050-1AA00-0BE8 manual Mathematic instruction, Short description
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