LOGO! functions

4.4 Special functions list - SF

4.4.35Max/Min (0BA7 only)

Short description

The Max/Min function records the maximum or minimum value of Ax.

Symbol in LOGO!

Wiring

Description

(Q

 

 

 

 

En

A signal at input En (Enable) outputs an analog value

 

 

 

 

 

to AQ, depending on the settings of parameters ERst

6

 

 

 

 

 

 

$[

 

$4

 

and Mode.

$[

 

 

 

 

 

 

 

 

 

 

 

S1

S1 functions only when the parameter Mode is set to

3DU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.

 

 

 

 

 

 

 

If Mode is set to 2, a change in status from 0 to 1 at

 

 

 

 

 

 

input S1 (selector) outputs the maximum value to AQ.

 

 

 

 

 

 

If Mode is set to 2, a change in status from 1 to 0 at

 

 

 

 

 

 

S1 outputs the minimum value to AQ.

 

 

 

 

 

Ax

Input Ax is one of the following analog signals:

 

 

 

 

 

 

• AI1 to AI8 (*)

 

 

 

 

 

 

•

AM1 to AM16

 

 

 

 

 

 

•

NAI1 to NAI32

 

 

 

 

 

 

•

AQ1 to AQ2

 

 

 

 

 

 

•

NAQ1 to NAQ16

 

 

 

 

 

 

• Block number of a function with analog output

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

Mode:

 

 

 

 

 

 

Possible settings:

 

 

 

 

 

 

0, 1, 2, 3

 

 

 

 

 

 

Mode = 0: AQ = Min

 

 

 

 

 

 

Mode = 1: AQ = Max

 

 

 

 

 

 

Mode = 2 and S1= 0 (low): AQ = Min

 

 

 

 

 

 

Mode = 2 and S1= 1 (high): AQ = Max

 

 

 

 

 

 

Mode = 3: AQ = Actual value of Ax

 

 

 

 

 

 

ERst (Enable Reset):

 

 

 

 

 

 

Possible settings:

 

 

 

 

 

 

ERst = 0: Disable reset

 

 

 

 

 

 

ERst = 1: Enable reset

 

 

 

 

 

 

Retentivity:

 

 

 

 

 

 

/ = No retentivity

 

 

 

 

 

 

R = The status is retentive

 

 

 

 

 

Output AQ

The function issues a minimum, maximum, or current

 

 

 

 

 

 

value at AQ, depending on your configuration.

* AI1...AI8: 0...10 V corresponds with 0...1000 (internal value).

LOGO!

 

Manual, 04/2011, A5E03556174-01

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Page 272 Page 274
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Image 273
Siemens 6ED1050-1AA00-0BE8 manual 35 Max/Min 0BA7 only, Mode
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