User manual

Publication 1760-UM001D-EN-P - September 2005

Retention 7-7

S/R Function

Task:

After a power failure, the lights in a stairwell should resume their

previous switching state. (This is another method to solve the same

task.)

Contacts and relays used:

Signal diagram:

U = Supply voltage

Coil Function

T2 Enable after first cycle

I1 Push-button

M1 Push-button pulse (rising edge detection)

M2 Pulse limitation (one shot)

Q1 Lamp output

M15 Impulse relay (retentive)

-----------TT2

I1-M2------{M1

--------{M2

M1-M15----SM15

M1-M15----RM15

M15-T2-----{Q1

RES

TRG

00.10

{

M15