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Rievtech x-Messenger Series - Page 253

Rievtech x-Messenger Series
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253
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.

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