User's Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
156 Manual, 04/2011, A5E03556174-01
4.4 Special functions list - SF
When you create your circuit program in LOGO!, you find the special function blocks in the
SF list.
You can invert the inputs of SFs individually, that is, the circuit program converts a logical "1"
at the input into a logical "0"; a logical "0" it converts into a logical "1". See the programming
example in topic "
Circuit program input (Page 86)".
The table also specifies whether the relevant function can be set retentive (Rem). The
following SFs are available:
View in LOGO! Name of the special function Rem
Times
4
7UJ
3DU
On-delay (Page 160) REM
4
7UJ
5
3DU
Off-delay (Page 164) REM
4
7UJ
3DU
On-/Off-delay (Page 166) REM
4
7UJ
5
3DU
Retentive on-delay (Page 168) REM
4
7UJ
3DU
Wiping relay (pulse output) (Page 170) REM
4
7UJ
5
3DU
Edge triggered wiping relay (Page 172) REM
4
(Q
,QY
3DU
Asynchronous pulse generator (Page 175) REM