Siemens SIMATIC STEP 7 V5.2 - Page 8

Introduction to STEP 7
1-2
STEP 7 Getting Started
A5E00171228-01
The third binary logic operation is the memory element. The SR function reacts
within a circuit diagram to certain voltage states and passes these on accordingly.
Memory Element
S
R
Key S
Key R
If key S is pressed, the bulb lights up
and remains lit until key R is pressed.