S_OSSD_In input

State-controlled input for the status of the connected safety-related sensor.

This input processes the status signal of the safety-related sensor (normal operation, test or request for the safety-related function). The signal present must be SAFETRUE so that the safety-related S_OSSD_Out output can be switched to SAFETRUE.

Data type: SAFEBOOL

Initial value: SAFEFALSE

Connection: Connect this input to the signal of a safety-related sensor (ESPE type 2) connected to the Safety Logic Controller, either directly or via additional safety-related functions/function blocks. Constant SAFETRUE or SAFEFALSE values are not permitted.

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

Value	Description
SAFETRUE	The light beam of the safety-related sensor is not interrupted. Refer to the hazard message below this table. The safety-related sensor is in normal operation, which means that no tests are active and the safety-related function has not been requested. The S_OSSD_Out output is switched to SAFETRUE provided that the function block has not detected any errors.
SAFEFALSE	The safety-related sensor is either in the process of performing a test or the light beam of the safety-related sensor is interrupted. The SAFEFALSE value can also indicate that a safety-related sensor is either disabled or inoperable.

If no start-up inhibit is specified for the function block, the SAFETRUE status at the S_OSSD_In input can cause the S_OSSD_Out output to immediately switch to SAFETRUE.

WARNING
	UNINTENDED START-UP If no start-up inhibit is specified: Be sure that your risk analysis includes an evaluation for the state change at the S_OSSD_Out output after applying SAFETRUE to the S_OSSD_In input. Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when applying SAFETRUE to the S_OSSD_In 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 is specified:

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