SF_SafetyRequest (FB)¶

FUNCTION_BLOCK SF_SafetyRequest

This function block provides the interface to a generic actuator, e.g. a safety drive or safety valve, to place the actuator in a safe state.

InOut:

Scope	Name	Type	Initial	Comment
Input	`Activate`	`BOOL`	FALSE	Activation of the FB.
	`S_OpMode`	`BOOL`	FALSE	Requested mode of a generic safe actuator. FALSE: Safe mode is requested. TRUE: Operation mode is requested.
	`S_Acknowledge`	`BOOL`	FALSE	Confirmation of the generic actuator, if actuator is in the Safe state. FALSE: Operation mode (non-safe). TRUE: Safe mode.
	`MonitoringTime`	`TIME`	TIME#0ms	Monitoring of the response time between the safety function request (S_OpMode set to FALSE) and the actuator acknowledgment (S_Acknowledge switches to TRUE).
	`S_StartReset`	`BOOL`	FALSE	Start behaviour 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_SafetyActive`	`BOOL`	FALSE	Confirmation of the Safe state. FALSE: Non-safe state. TRUE: Safe state.
	`S_SafetyRequest`	`BOOL`	FALSE	Request to place the actuator in a safe state. FALSE: Safe state is requested. TRUE: Non-safe state.
	`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