SF_TestableSafetySensor (FB)¶

FUNCTION_BLOCK SF_TestableSafetySensor

This function block detects, for example, the loss of the sensing unit detection capability, the response time exceed-ing that specified, and static ON signal in single-channel sensor systems.

It can be used for external testable safety sensors (ESPE: Electro-sensitive protective equipment, such as a light beam).

InOut:

Scope	Name	Type	Initial	Comment
Input	`Activate`	`BOOL`	FALSE	Activation of the FB.
	`S_OSSD_In`	`BOOL`	FALSE	Status of sensor output, e.g., light curtain. FALSE: Safety sensor in test state or demand for safety-related response. TRUE: Sensor in the state for normal operating conditions.
	`StartTest`	`BOOL`	FALSE	Input to start sensor test. Sets “S_TestOut” and starts the internal time monitoring function in the FB. FALSE: No test requested. TRUE: Test requested.
	`TestTime`	`TIME`	TIME#10ms	Test time of safety sensor. Range from 0 to 150ms.
	`NoExternalTest`	`BOOL`	FALSE	Indicates if external manual sensor test is supported. FALSE: The external manual sensor test is supported. Only after a complete manual sensor switching sequence, a automatic test is possible again after a faulty automatic sensor test. TRUE: The external manual sensor test is not supported. An automatic test is possible again without a manual sensor switch-ing sequence after faulty automatic sensor test.
	`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_OSSD_Out`	`BOOL`	FALSE	Safety related output indicating the status of the ESPE. FALSE: The sensor has a safety-related action request or test error. TRUE: The sensor has no safety-related action request AND no test error.
	`S_TestOut`	`BOOL`	FALSE	Coupled with the test input of the sensor. Although specified as SAFEBOOL, in practice this signal will often be connected to a BOOL output. FALSE: Test request issued. TRUE: No test request.
	`TestPossible`	`BOOL`	FALSE	Feedback signal to the process. FALSE: An automatic sensor test is not possible. TRUE: An automatic sensor test is possible.
	`TestExecuted`	`BOOL`	FALSE	A positive signal edge indicates the successful execution of the au-tomatic sensor test. FALSE: An automatic sensor test was not executed yet or an automatic sensor test is active or an automatic sensor test was faulty. TRUE: A sensor test was executed successfully.
	`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