IDEC SmartRelay functions
190
IDEC SmartRelay Manual
4.4.21 Latching relay
Short description
Input S sets output Q, input R resets output Q again.
S
R
Q
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:
When retentivity is enabled, the current status of the output
signal is retained after a power failure.
Symbol in IDEC
SmartRelay
Wiring
Description
Input S
You set output Q with a signal at input
S.
Input R
You reset output Q 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 Q
Q is set with a signal at input S, and
reset with a signal at input R.
S
n
R
n
Q
Comment
0
0
x
The status is retentive
0
1
0
Reset
1
0
1
Set
1
1
0
Reset (takes priority over Set)
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