LOGO! functions

4.4 Special functions list - SF

4.4.26Softkey

Short description

This special function has the effect of a mechanical pushbutton or switch.

Symbol in LOGO!

Wiring

Description

 

 

 

 

 

Input En

Output Q is set with a 0 to 1 transition of the signal at

(Q

 

 

 

 

 

input En (Enable), and if 'Switch=On' was confirmed

 

 

 

4

 

in parameter assignment mode.

3DU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

Programming mode:

 

 

 

 

 

 

Selecting the function for pushbutton action for the

 

 

 

 

 

 

duration of one cycle, or for switching action.

 

 

 

 

 

 

Start: On or off state, initialized at the first start of the

 

 

 

 

 

 

program if retentivity is disabled.

 

 

 

 

 

 

Retentivity:

 

 

 

 

 

 

/ = No retentivity

 

 

 

 

 

 

R = The status is retentive.

 

 

 

 

 

 

Parameter assignment mode (RUN mode):

 

 

 

 

 

 

Switch: Switches the momentary pushbutton (switch)

 

 

 

 

 

 

on or off.

 

 

 

 

 

Output Q

Switches on if En=1 and Switch=On was confirmed

 

 

 

 

 

 

with OK.

Factory setting

The default parameter setting is switching action.

Timing diagram

(Q

6ZLWFK

4

Functional description

In parameter assignment mode, the output is set with a signal at input En, if the 'Switch' parameter is set to 'On' and confirmed with OK. Whether the function was configured for pushbutton or switching action is of no concern here.

The output is reset to '0' in the following three cases:

After a 1 to 0 transition at input En

When the function was configured for momentary pushbutton action, and one cycle has expired since it was switched on

When the position 'Off' was selected at the 'Switch' parameter and confirmed with OK in parameter assignment mode

If retentivity is not set, output Q is initialized after a power failure according to your configuration at the "Start" parameter.

LOGO!

 

Manual, 04/2011, A5E03556174-01

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Image 243
Siemens 6ED1050-1AA00-0BE8 manual Softkey, Factory setting

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