LOGO! functions

4.4 Special functions list - SF

4.4.3On-/Off-delay

Short description

The on-/off-delay function sets the output after the set on-delay time has expired, and resets it upon expiration of the off-delay time.

Symbol in LOGO!

Wiring

Description

 

 

 

 

 

 

 

 

 

 

Input Trg

A positive edge (0 to 1 transition) at input Trg

7UJ

 

 

 

 

 

 

 

 

4

 

(Trigger) triggers the on-delay time TH.

 

 

 

 

 

 

 

 

 

3DU

 

 

 

 

 

 

 

 

 

A negative edge (1 to 0 transition) at input Trg

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Trigger) triggers the off-delay time TL.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

TH is the time after which the output is set hi (output

 

 

 

 

 

 

 

 

 

 

 

signal transition 0 to 1).

 

 

 

 

 

 

 

 

 

 

 

TL is the time after which the output is reset ( output

 

 

 

 

 

 

 

 

 

 

 

signal transition 1 to 0).

 

 

 

 

 

 

 

 

 

 

 

Retentivity:

 

 

 

 

 

 

 

 

 

 

 

/ = No retentivity

 

 

 

 

 

 

 

 

 

 

 

R = The status is retentive.

 

 

 

 

 

 

 

 

 

 

Output Q

Q is set when the configured time TH has expired and

 

 

 

 

 

 

 

 

 

 

 

Trg is still set. It is reset on expiration of the time TL, if

 

 

 

 

 

 

 

 

 

 

 

the trigger Trg has not been set again.

Parameters TH and TL

Note the preset values for the parameters TH and TL in topic Time response (Page 151).

The on-delay and off-delay times for parameters TH and TL can be based on the actual value of another, already-configured 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)

● Mathematic instruction (Page 265) (actual value AQ) ● PI controller (Page 256) (actual value AQ)

● Up/down counter (Page 201) (actual value Cnt)

 

If your LOGO! is a LOGO! 0BA7, you can additionally use the actual values of the following

 

functions:

 

● Analog filter (0BA7 only) (Page 271) (actual value AQ)

 

● Average value (0BA7 only) (Page 276) (actual value AQ)

 

● Max/Min (0BA7 only) (Page 273) (actual value AQ)

 

LOGO!

166

Manual, 04/2011, A5E03556174-01

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Siemens 6ED1050-1AA00-0BE8 manual 3 On-/Off-delay, Parameters TH and TL
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