ProcessControl input

The input evaluates the request of the process coming from the standard controller to switch the S_OutControl enable output of the function block to SAFETRUE.

The signal signals the operation start/stop from the standard controller. The enable output of the function block and thus the safety-related output of a safety-related device is controlled by considering the states at ProcessControl and at S_SafeControl (upstream safety-related function) as well as at the other inputs.

Depending on the setting at StaticControl, the input is evaluated state-controlled (StaticControl = TRUE) and/or edge-controlled (StaticControl = FALSE).

Data type: BOOL

Initial value: FALSE

Connection: Connect this input to a signal from the standard controller, for example via an exchange variable or with a constant.

If the function block is activated (Activate = TRUE), the possible values at this input lead to the following function block behavior:

Value	Description
TRUE	Request to switch the S_OutControl enable output to TRUE (running operation is signaled). Refer to the hazard message below this table.
FALSE (with StaticControl = TRUE)	Request to switch the S_OutControl enable output to FALSE (operation stop is signaled). The S_OutControl output is switched to SAFEFALSE.
Edge FALSE > TRUE (with StaticControl = FALSE)	A positive signal edge signals the start of operation in the standard controller. A further permanent TRUE signal after a positive signal edge has the effect described at TRUE.

If no start-up inhibit is specified for the function block and no additional operation stop of the standard controller is specified with StaticControl = TRUE, the TRUE status at the ProcessControl input can cause the S_OutControl output to switch to SAFETRUE immediately.

WARNING
	UNINTENDED START-UP If no start-up inhibit and no additional operation stop of the standard controller (StaticControl = TRUE) is specified: Be sure that your risk analysis includes an evaluation for the state change at the S_OutControl output after applying TRUE to the ProcessControl input. Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when applying TRUE to the ProcessControl input. 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

If no start-up inhibit and no additional operation stop of the standard controller (StaticControl = TRUE) is specified:

Be sure that your risk analysis includes an evaluation for the state change at the S_OutControl output after applying TRUE to the ProcessControl input.
Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when applying TRUE to the ProcessControl input.
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.

NOTE:

If the function block expects a positive edge at ProcessControl once the request for the safety-related function has been removed and the function block has been activated (due to StaticControl = FALSE), a permanent TRUE signal at ProcessControl is regarded as an error. In this case, switch ProcessControl to FALSE to reset the error. Note that no additional positive edge is required at the Reset input.