Latching Relay - IDEC FL1E-H12RCA User Manual

IDEC SmartRelay functions

4.4.21 Latching relay

Short description
Input S sets output Q, input R resets output Q again.
Symbol in IDEC
SmartRelay
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:
S R
n
0
0
1
1
When retentivity is enabled, the current status of the output
signal is retained after a power failure.
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Wiring
Input S
Input R
Parameter Retentivity: 
Output Q
R
S
Q
Q Comment
n
0 x The status is retentive
1 0 Reset
0 1 Set
1 0 Reset (takes priority over Set)
Description
You set output Q with a signal at input
S.
You reset output Q with a signal at
input R. If S and R = 1, the output is
reset.
/ = No retentivity
R = The status is retentive.
Q is set with a signal at input S, and
reset with a signal at input R.
IDEC SmartRelay Manual