Latching relay

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Short description

A signal at input S sets output Q. A signal at input R resets output Q.

 

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.

Timing diagram

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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.

 

Overview