Rievtech EXM-12DC-DA-R-HMI, User Manual, Page: 253 / 443

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No parameter of Latching relay can be set/modified in parameter mode .
Timing diagram
Description of the function
The latching relay represents a simple binary memory logic. The output value depends on the input states
and the previous status at the output.
Logic table of the latching relay:
S R Q Remark
0 0 x Status unchanged
0 1 0 Reset
1 0 1 Set
1 1 0 Reset
When retentivity is enabled, the output signal corresponds with the signal status prior to the power failure.
Connection Description
Input S Set output Q with a signal at input S (Set).
Input R Reset output Q with a signal at input R (Reset). Output Q is
reset if S and R are both set (reset has priority over set).
Parameter Retentivity set (on) = the status is retentive in memory.
Output Q Q is set with a signal at input S and remains set until it is
reset with signal at input R.