SF_Guard (FB)

FUNCTION_BLOCK SF_Guard

This function block monitors the relevant safety guard.

There are two independent input parameters for two switches at the safety guard coupled with a time difference (DiscrepancyTime) for closing the guard.

InOut:

Scope	Name	Type	Initial	Comment
Input	Activate	BOOL	FALSE	Activation of the FB.
	S_GuardSwitch1	BOOL	FALSE	Guard switch 1 input. FALSE: Guard is not closed. TRUE: Guard is closed.
	S_GuardSwitch2	BOOL	FALSE	Guard switch 2 input. FALSE: Guard is not closed. TRUE: Guard is closed.
	DiscrepancyTime	TIME	TIME#0ms	Configures the monitored synchronous time between S_GuardSwitch1 and S_GuardSwitch2.
	S_StartReset	BOOL	FALSE	Start behaviour of safety FB
	S_AutoReset	BOOL	FALSE	Behaviour on error of safety FB
	Reset	BOOL	FALSE	Manual reset of FB
Output	Ready	BOOL	FALSE	Activation of the FB. TRUE indicates that the FB is activated and the outputs results are valid, FALSE the FB is not active and the program is not executed.
	S_GuardOut	BOOL	FALSE	Output indicating that the guard is closed and the guarded area safe. FALSE: Guard is open. TRUE: both S_GuardSwitches are TRUE, no error and acknowledgment. Guard is closed.
	SafetyDemand	BOOL	FALSE	Output indicating that the FB is active and the primary safety function is demanded (e.g. related to the safety functionality).
	ResetRequest	BOOL	FALSE	Output which can be used to signal the operator to press the reset functionality to continue.
	Error	BOOL	FALSE	Error flag
	DiagCode	WORD	0	Diagnostic register