Activate input

State-controlled input for activating the function block.

Data type: BOOL

Initial value: FALSE

Connection: With TRUE constant or TRUE/FALSE input signal.

Connecting the Activate input to an input signal makes it possible to switch off specific safety-related functions in a targeted manner (e.g., individual areas of machines and systems with a modular construction).

The function block is deactivated when Activate = FALSE. Deactivated function blocks switch their outputs to the defined safe state. S_EnableSwitchOut = SAFEFALSE and Error = FALSE signals that no error has been detected.

Further Information:

Application examples and information on how to carry out individual deactivation, group deactivation or how to set up modular safety equipment using function block activation can be found in "Activating function blocks".

Value	Description
TRUE	The function block is activated, the inputs are evaluated, and the outputs switched accordingly. NOTE: S_AutoReset = SAFEFALSE specifies a restart inhibit which becomes active after a valid signal combination has been returned at inputs S_EnableSwitchCh1 and S_EnableSwitchCh2. The restart inhibit is removed by a FALSE > TRUE edge at the Reset input. Once the restart inhibit has been removed, the status at the S_EnableSwitchOut output can immediately switch from SAFEFALSE to SAFETRUE (depending on the other input signals). Refer to the hazard message below this table.
FALSE	The function block is not activated. The S_EnableSwitchOut output is switched to SAFEFALSE.

Value

Description

TRUE

The function block is activated, the inputs are evaluated, and the outputs switched accordingly.

NOTE:

S_AutoReset = SAFEFALSE specifies a restart inhibit which becomes active after a valid signal combination has been returned at inputs S_EnableSwitchCh1 and S_EnableSwitchCh2.

The restart inhibit is removed by a FALSE > TRUE edge at the Reset input.

Once the restart inhibit has been removed, the status at the S_EnableSwitchOut output can immediately switch from SAFEFALSE to SAFETRUE (depending on the other input signals).

Refer to the hazard message below this table.

FALSE

The function block is not activated. The S_EnableSwitchOut output is switched to SAFEFALSE.

WARNING
	UNINTENDED START-UP Be sure that your risk analysis includes an evaluation for the state change at the S_EnableSwitchOut output after activating the safety-related function block or after removing the restart inhibit. Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when activating the safety-related function block or when removing the restart inhibit. Use appropriate safety interlocks where personnel and/or equipment hazards exist. Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING

UNINTENDED START-UP

Be sure that your risk analysis includes an evaluation for the state change at the S_EnableSwitchOut output after activating the safety-related function block or after removing the restart inhibit.
Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when activating the safety-related function block or when removing the restart inhibit.
Use appropriate safety interlocks where personnel and/or equipment hazards exist.

Failure to follow these instructions can result in death, serious injury, or equipment damage.