S_UnlockGuard output

Output for the unlock signal for the guard locking on the safety equipment.

The signal depends on the unlock request present at the UnlockRequest input and on the defined safe state status of the zone of operation (S_SafetyActive input).

Data type: SAFEBOOL

Connection: Connect the S_UnlockGuard output to an interlocking device (e.g., coil of the guard locking) connected to the Safety Logic Controller, either directly or via other safety-related functions/function blocks.

Value	Description
SAFETRUE	There is a request to unlock the guard locking on the safety equipment. The following conditions must be met: The function block has been activated (input Activate = TRUE) and a request to unlock the guard locking has been made via a rising edge at input UnlockRequest and the request to unlock the guard locking (UnlockRequest = TRUE) must remain present until the door is opened. If it does not remain present, the guard locking will lock again and the zone of operation will signal the defined safe state by means of a SAFETRUE signal at S_SafetyActive.
SAFEFALSE	There is no request to unlock the guard locking on the safety equipment, i.e., the interlock is maintained. Reasons: The function block is not active (input Activate = FALSE) or no unlock request has been made via a rising edge at input UnlockRequest or the request to unlock the guard locking (UnlockRequest = TRUE ) was canceled before the safety equipment was opened or the zone of operation signals the non-safe state (S_SafetyActive = SAFEFALSE) if the safety equipment is open (S_GuardMonitoring = SAFEFALSE).

Value

Description

SAFETRUE

There is a request to unlock the guard locking on the safety equipment. The following conditions must be met:

The function block has been activated (input Activate = TRUE)
and a request to unlock the guard locking has been made via a rising edge at input UnlockRequest
and the request to unlock the guard locking (UnlockRequest = TRUE) must remain present until the door is opened. If it does not remain present, the guard locking will lock again
and the zone of operation will signal the defined safe state by means of a SAFETRUE signal at S_SafetyActive.

SAFEFALSE

There is no request to unlock the guard locking on the safety equipment, i.e., the interlock is maintained. Reasons:

The function block is not active (input Activate = FALSE)
or no unlock request has been made via a rising edge at input UnlockRequest
or the request to unlock the guard locking (UnlockRequest = TRUE ) was canceled before the safety equipment was opened
or the zone of operation signals the non-safe state (S_SafetyActive = SAFEFALSE) if the safety equipment is open (S_GuardMonitoring = SAFEFALSE).

The S_UnlockGuard signal may only switch to SAFETRUE if the zone of operation unlocked in this way is in the defined safe state.

WARNING
	NON-CONFORMANCE TO SAFETY FUNCTION REQUIREMENTS Be sure that your risk analysis includes an evaluation for the state change at the S_UnlockGuard output. Validate the overall safety-related function, including the start-up behavior of the process, and thoroughly test the application. 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

NON-CONFORMANCE TO SAFETY FUNCTION REQUIREMENTS

Be sure that your risk analysis includes an evaluation for the state change at the S_UnlockGuard output.
Validate the overall safety-related function, including the start-up behavior of the process, and thoroughly test the application.
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.