LOGO! functions

4.4 Special functions list - SF

4.4.15Up/down counter

Short description

An input pulse increments or decrements an internal value, depending on the parameter setting. The output is set or reset when a configured threshold is reached. The direction of count can be changed with a signal at input Dir.

Symbol in LOGO!

Wiring

Description

5

 

 

Input R

A signal at input R resets the internal count value to

 

 

 

zero.

&QW

 

 

 



4

Input Cnt

The function counts the 0 to 1 transitions at input Cnt.

'LU

 

3DU

 

 

 

1 to 0 transitions are not counted.

 

 

 

 

Use

 

 

 

 

inputs I3, I4, I5, and I6 for fast counting (only

 

 

 

 

LOGO! 12/24RC/RCo, LOGO! 12/24RCE, LOGO!

 

 

 

 

24/24o and LOGO! 24C/24Co): max. 5 kHz, if the

 

 

 

 

fast input is directly connected to the up/down

 

 

 

 

counter function block

 

 

 

 

any other input or circuit component for counting

 

 

 

 

low frequency signals (typ. 4 Hz).

 

 

 

 

 

 

 

 

Input Dir

You set the direction of count at input Dir:

 

 

 

 

Dir = 0: Count up

 

 

 

 

Dir = 1: Count down

 

 

 

Parameter

On: On threshold

 

 

 

 

Range of values:

 

 

 

 

0...999999

 

 

 

 

Off: Off threshold

 

 

 

 

Range of values:

 

 

 

 

0...999999

 

 

 

 

StartVal: Initial value from which to begin counting

 

 

 

 

either down or up.

 

 

 

 

Retentivity for internal counter value Cnt:

 

 

 

 

/ = No retentivity

 

 

 

 

R = The status is retentive.

 

 

 

Output Q

Q is set or reset, depending on the current value at

 

 

 

 

Cnt and the set thresholds.

LOGO!

 

Manual, 04/2011, A5E03556174-01

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Siemens 6ED1050-1AA00-0BE8 manual 15 Up/down counter, Short description

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