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LD Language Elements
SR2MAN01 11/2007 105
Latching:
By default, if a power break occurs while a timer function block is running, any
information on time already elapsed is lost. When the supply voltage returns, the
time function block is reinitialized and ready for a new operating cycle.
If the application requires it, the time elapsed before the power break can be
memorized using the Latching parameter.
Symbol of the Latching parameter:
This function is used to save the state of the timer's current values and memorize
the elapsed time in the event of a power break.
Illustration: Configuring a counter from the front panel of the smart relay:
Description:
Number Parameter Description
1 Command input Command input timing diagram.
2 Reset input Reset input timing diagram.
3 Timer output Timer output timing diagram.
4 Parameter lock This parameter is used to lock the counter parameters. When
the block is locked, the preset value no longer appears in the
PARAMETERS menu.
5 Timer on-delay Timer on-delay of the A/C timer.
6 Timer off-delay Timer off-delay of the A/C timer.
7 Time unit Time unit for the preset value.
8 Latching Backup of state of the current counter value in the event of a
power cut.
9 Timer type Type of timer used.
Activé Non activé
2
Menu / OK
-+
R T 1 M : S
T T 1
T 1
A = 0 0 : 2 0 B = 0 0 : 4 5
89
7
1
A C
a
2
33
4
65
b