BECKHOFF EL6900-FB - Manual (Page 69)

Function blocks
Function blocks for TwinSAFE logic terminals 67
3.11 The SR function block
3.11.1 Functional description
The FB SR realizes a set / reset functionality. Logic 1 at input Set and logic 0 at input Reset leads to logic
1 at the output. Logic 0 at input Set and logic 1 at input Reset leads to logic 0 at the output. If both inputs
are set to logic 1, the Set signal is dominant and leads to logic 1 at the output. If both inputs are logic 0,
the output remains in its current state.
Figure 3-29: SR function block
Note
KL6904
The SR block is not available in the KL6904.