FB_SR

Description Function Block

The FB_SR function block implements a Set/Reset functionality. A logic 1 at the bSafeSet input and a logic 0 at the bSafeReset input results in a logic 1 at the output. A logic 0 at the bSafeSet input and a logic 1 at the bSafeReset input results in a logic 0 at the output. If both inputs are set to logic 1, then the Set signal is dominant and leads to a logic 1 at the output. If both inputs are set to logic 0, then the output remains in its current state.

Table 24. VAR_INPUT

Name	Data Type	Initial Value	Description, Parameter Values
`bSet`	`SAFEBOOL`	`FALSE`	1st input channel: The Negation command can be used to specify whether a normally closed contact (safe state is requested for logic 0) or a normally open contact (safe state is requested for logic 1) is linked to this input.
`bReset`	`SAFEBOOL`	`FALSE`	2nd input channel: The Negation command can be used to specify whether a normally closed contact (safe state is requested for logic 0) or a normally open contact (safe state is requested for logic 1) is linked to this input.

Table 25. VAR_OUTPUT

Name	Data Type	Initial Value	Description, Parameter Values
`bSROut`	`SAFEBOOL`	`FALSE`	Output channel: The safe state corresponds to logic 0.