A Faster Way To Create Logic State Latches - Siemens SIMATIC S7-200 Getting Started

2.5

A faster way to create logic state latches

Getting Started - Advanced
Training Documents, 09/2007, A5E01469795B
Instead of feeding back the output, as in the previous example, here the
functions "Set" and "Reset" are used instead. Have a look at the ladder
diagram below.
2.5 A faster way to create logic state latches
For the "Set" operation -(S), a
switching pulse at I0.0 has the
effect that Q0.0 is activated in a
steady state.
For the "Reset" operation -(R), a
switching pulse at I0.1 has the
effect that Q0.0 is deactivated
again.
Latching
-(S) Set
-(R) Reset
Steady-state
setting of
value with (S)
Resetting with
(R)
Last
operation in
cycle has
priority
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