Siemens SINAMICS S110 - PST (Pulse Stretcher); RSR (RS Flip-Flop, Reset Dominant)

Drive functions
7.3 Function modules
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
309
7.3.8.16 PST (pulse stretcher)
Brief description
Timer for generating a pulse with a minimum duration and an additional reset input
Mode of operation
The rising edge of a pulse at input I sets output Q to 1.
Output Q does not return to 1 until input pulse I is 0 and pulse duration T has expired.
Output Q can be set to zero at any time via reset input R with R = 1.
Time flow chart
Output pulse Q as a function of pulse duration T and input pulse I (when R = 0).
I
Q
0
1
0
1
TTT
Figure 7-76 PST (pulse stretcher): Time flow chart
7.3.8.17 RSR (RS flip-flop, reset dominant)
Brief description
Reset dominant RS flip-flop for use as a static binary value memory
Mode of operation
With logical 1 at input S, output Q is set to logical 1.
If input R is set to logical 1, output Q is set to logical 0.
If both inputs are logical 0, Q does not change.
If both inputs are logical 1, however, Q is logical 0 because the reset input dominates.
Output QN always has the opposite value to Q.