S_GuardOut output

Output signal of the safety-related function block (enable signal).

Data type: SAFEBOOL

The enable signal is the safety-related acknowledge signal from the connected guard for the process to be controlled. Its value depends on the values at inputs S_GuardSwitch1 and S_GuardSwitch2 (and, as a result, on the status of the safety equipment), as well as on a start-up/restart inhibit that may be specified.
The S_GuardOut output signal also controls the request for the stop function.

Hinweis
Since the enable signal is present at the S_GuardOut output, this output is also referred to as the enable output.

Connection: Connect the S_GuardOut output to an output terminal of your application, either directly or via other safety-related functions/function blocks.

The enable signal may only control the process directly if this does not adversely affect the safety-related function.

WARNUNG

Unintended machine operation

Verify that the enable signal only controls the process directly if this does not adversely affect the safety-related function.

Validate the overall safety-related function, including the start-up behavior of the process, and thoroughly test the application.

Value Description

SAFETRUE No stop function is requested (normal operation). The following conditions must be met:

The function block has been activated (input Activate = TRUE)

and the safety equipment is not open (i.e., both inputs S_GuardSwitch1 and S_GuardSwitch2 are SAFETRUE)

and no start-up/restart inhibit is active (setting made with S_StartReset and/or S_AutoReset)

and the function block has not detected an error.

SAFEFALSE The process to be controlled is not enabled and the stop function is requested.
This may be due to one of the following reasons:

The function block is not activated (input Activate = FALSE)

or the function block detects that the safety equipment is open (input S_GuardSwitch1 or S_GuardSwitch2, or both, are SAFEFALSE)

or a start-up/restart inhibit is active (setting made with S_StartReset and/or S_AutoReset)

or the function block has detected an error.

Value	Description
SAFETRUE	No stop function is requested (normal operation). The following conditions must be met: The function block has been activated (input Activate = TRUE) and the safety equipment is not open (i.e., both inputs S_GuardSwitch1 and S_GuardSwitch2 are SAFETRUE) and no start-up/restart inhibit is active (setting made with S_StartReset and/or S_AutoReset) and the function block has not detected an error.
SAFEFALSE	The process to be controlled is not enabled and the stop function is requested. This may be due to one of the following reasons: The function block is not activated (input Activate = FALSE) or the function block detects that the safety equipment is open (input S_GuardSwitch1 or S_GuardSwitch2, or both, are SAFEFALSE) or a start-up/restart inhibit is active (setting made with S_StartReset and/or S_AutoReset) or the function block has detected an error.

The risk of unintended start-up/restart and/or manipulation can be reduced by combining a stop request from the safety-related application and an operation stop from the standard application.

WARNUNG

Unintended start-up

Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when starting up the Sicherheitssteuerung.

Make certain that no unintended start-up/restart or manipulation can occur.

Validate the overall safety-related function, including the start-up/restart behavior of the process, and thoroughly test the application.

Precise details of the behavior of the S_GuardOut output in relation to the start-up/restart inhibit are given in the following table:

Formal parameter Value Action Start-up/restart inhibit Reset Enable output

S_StartReset SAFETRUE After function block activation/Sicherheitssteuerung start-up, the start-up inhibit is ... not active No action is required at Reset, ... - to switch the enable output S_GuardOut to SAFETRUE if there is a valid input signal combination.
- to exit the start-up/restart inhibit.

SAFEFALSE active Reset must be switched from FALSE to TRUE, ...

S_AutoReset SAFETRUE After the SAFETRUE signal has returned at inputs S_GuardSwitch1 and S_GuardSwitch2, the restart inhibit is not active No action is required at Reset, ...

SAFEFALSE active Reset must be switched from FALSE to TRUE, ...

Formal parameter	Value	Action	Start-up/restart inhibit	Reset	Enable output
S_StartReset	SAFETRUE	After function block activation/Sicherheitssteuerung start-up, the start-up inhibit is ...	not active	No action is required at Reset, ...	- to switch the enable output S_GuardOut to SAFETRUE if there is a valid input signal combination. - to exit the start-up/restart inhibit.
S_StartReset	SAFEFALSE		active	Reset must be switched from FALSE to TRUE, ...
S_AutoReset	SAFETRUE	After the SAFETRUE signal has returned at inputs S_GuardSwitch1 and S_GuardSwitch2, the restart inhibit is	not active	No action is required at Reset, ...
S_AutoReset	SAFEFALSE		active	Reset must be switched from FALSE to TRUE, ...