Contrast Adjustment; Random Function - Siemens 7LF4 4220 Mode D'emploi

Contrast adjustment

Data key
1
7
C1 C2
Load the programs of the time switch on to a data key (WRITE KEY)
Warning! all programs already existing on the data key will be overwritten.
1
7
Load the programs from the data key to the time switch (READ KEY)
Warning! all programs already programmed in the time switch will be overwritten.
Hour counter
Displays the total relay ON time, from 0 to 65535 h, and the date of the last
reset.

Random function

Function active: the programmed switching cycles are shifted at random within the
range of ± 30 minutes.
1
7
or
C1 C2
1
or
7
3/3