Siemens Simatic S5-101U - Setting;Resetting Operations; RS Flip-Flop for Latched Signal Outputs; RS Flip-Flop with Flags

5.1.2 Setting /resetting operations
RS flip-flop for latched signal outputs
Original I STEP 5 representation
:' .... :.:':.*..::'L,::.: .... :..
A "1" at input I 1.4 resets the
@$@E;:@: ...%..:. S..: is only necessary if program is
flip-flop. to be represented in LAD or CSF form
on the
670/675 programmer. When
If the signal at input I 1.4 changes programming with LAD or CSF, these
to "OU, this status is maintained. NOP @ operations are automat ical ly
i ncl uded.
Control system
flowchart
Statement
list
11 4 I17
Q1 5
RS flip-flop with flags
Ladder
diagram
A I17 I 1.7 Q 1 5
S Q15
Q 15
R Q15
HOP #f
R a
Original
I
A "1" at signal I 1.7 sets the flip- If the set (input I 1.7) and reset
flop.
(input
I 1.4) signals are applied
simultaneously, the scan operation
If the signal at input I 1.7 changes
last programmed (in this case AI 1.4)
to
"ON, this status is maintained, i.e.
remains effective during processing
the signal is latched. of the remaining program.
A
"1" at input I 1.6 sets the flip-
If the signal at input I 1.3 changes
flop.
to
"OM, this status is maintained.
If the set (input I 1.6) and reset
If the signal at input I 1.6 changes
(input
I 1.3) signals are applied si-
to
"OM, this status is maintained,
mu1 taneously, the scanning operation
i.e. the signal is latched.
last programmed (in this case AI 1.6)
remains effective during processing of
A
"1" at input I 1.3 resets the
the remaining program, i.e. flag
F 1.7
flip-flop.
is set (setting signal has priority over
the resetting signal
).
5.4
STEP 5 representation
Control system
flowchart
Statement Ladder
A 113
= 0 14
I
list
diagram