Siemens LOGO! Series - Page 194

LOGO! functions
4.4 Special functions list - SF
LOGO!
194 Manual, 04/2011, A5E03556174-01
Backup of the real-time clock
The internal real-time clock of LOGO! is buffered against power failure. The buffering time is
influenced by the ambient temperature, and is typically 80 hours at an ambient temperature
of 25°C. If you are using the optional LOGO! Battery card, or combined LOGO!
Memory/Battery card, LOGO! can retain the clock time for up to two years.
Sample configuration
The output of a LOGO! is to be set annually on March 1, reset on April 4, set again on July 7,
and reset again on November 19. You need to configure two yearly timers with
corresponding on-times. Then logically link the outputs by means of an OR block.
3XOVH 2II
0RQWKO\ 2II
<HDUO\ 2Q
%

<<<<00''
21
%

<<<<00''
2))
%
3XOVH 2II
0RQWKO\ 2II
<HDUO\ 2Q
%

<<<<00''
21
%

<<<<00''
2))
%
2IIWLPH$SU
2QWLPH0DU
<HDUO\7LPHU
2IIWLPH1RY
2QWLPH-XO
<HDUO\7LPHU
Result
%
%
2Q
1RYHPEHU
DWK
-XO\
DWK
$SULO
DWK
0DUFK
DWK
2II