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
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5
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3DU
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