IDEC SmartRelay Manual
193
IDEC SmartRelay functions
4.4 Special functions list - SF
4.4.23
Latching relay
Short description
Input S sets output , input R resets output again.
Timing diagram
Switching response
A latching relay represents a simple binary element. The output value depends on the status
at the inputs and on the previous output status. The following table shows the logic once
again:
hen retentivity is enabled, the current status of the output signal is retained after a power
failure.
Symbol in
IDEC SmartRelay
iring
Description
Input S
ou set output with a signal at input S.
Input R
ou reset output with a signal at input R. If S and R
1, the output is reset.
Parameter
Retentivity:
/ no retentivity
R the status is retentive.
Output
is set with a signal at input S, and reset with a signal
at input R.
S
n
R
n
Comment
0
0
x
The status is retentive
0
1
0
Reset
1
0
1
Set
1
1
0
Reset (takes priority over Set)
56
4
6
5
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4
5
6
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