S_StartReset input

This input is used to specify the start-up inhibit after the Safety Logic Controller has been started up or after the function block has been activated.

When a start-up inhibit is active, all safety-related outputs of the function block are in the defined safe state. This ensures that a machine/system cannot be started up inadvertently. If a start-up inhibit is active, a reset signal is required to remove the inhibit and enable the machine/system to function.

Data type: SAFEBOOL

Initial value: SAFEFALSE

Connection: Connect this input to a variable or constant.

If Activate = TRUE, the possible values at S_StartReset lead to the following function block behavior:

Value	Description
SAFETRUE	No start-up inhibit for the function block after the Safety Logic Controller has been started up and after the function block has been activated. If no start-up inhibit has been specified for the function block, the SAFETRUE status at the S_GuardLock input can cause the S_GuardLocked output to immediately switch to SAFETRUE. Refer to the first hazard message below this table.
SAFEFALSE	Active start-up inhibit after the Safety Logic Controller has been started up and after the function block has been activated. The active start-up inhibit must be manually removed by means of a reset signal at the Reset input. Removing the start-up inhibit by means of a positive signal edge at the Reset input can cause the S_GuardLocked output to switch to SAFETRUE immediately (depending on the status of the other inputs). Refer to the second hazard message below the table.

Value

Description

SAFETRUE

No start-up inhibit for the function block after the Safety Logic Controller has been started up and after the function block has been activated.

If no start-up inhibit has been specified for the function block, the SAFETRUE status at the S_GuardLock input can cause the S_GuardLocked output to immediately switch to SAFETRUE.

Refer to the first hazard message below this table.

SAFEFALSE

Active start-up inhibit after the Safety Logic Controller has been started up and after the function block has been activated.

The active start-up inhibit must be manually removed by means of a reset signal at the Reset input.

Removing the start-up inhibit by means of a positive signal edge at the Reset input can cause the S_GuardLocked output to switch to SAFETRUE immediately (depending on the status of the other inputs).

Refer to the second hazard message below the table.

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_GuardLocked output after applying SAFETRUE to the S_GuardLock 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_GuardLock 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_GuardLocked output after applying SAFETRUE to the S_GuardLock 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_GuardLock 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 Verify the impact of removing the start-up inhibit by means of a positive signal edge at the Reset input. Make certain that appropriate procedures and measures (according to applicable sector standards) have been taken to help avoid hazardous situations when removing the start-up inhibit. Do not enter the zone of operation when removing the start-up inhibit. Ensure that no other persons can access the zone of operation when removing the start-up inhibit. 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

Verify the impact of removing the start-up inhibit by means of a positive signal edge at the Reset input.
Make certain that appropriate procedures and measures (according to applicable sector standards) have been taken to help avoid hazardous situations when removing the start-up inhibit.
Do not enter the zone of operation when removing the start-up inhibit.
Ensure that no other persons can access the zone of operation when removing the start-up inhibit.
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.

The start-up inhibit must only be deactivated (S_StartReset = SAFETRUE) if it is certain that starting up the machine/system will not lead to a hazardous situation or that a suitable start-up inhibit is in place at another location or using other means.

WARNING
	NON-CONFORMANCE TO SAFETY FUNCTION REQUIREMENTS Verify the impact of a deactivated start-up inhibit (S_StartReset = SAFETRUE) on your machine or process prior to implementation. Observe the regulations given by relevant sector standards regarding the start-up inhibit. Verify that a suitable start-up inhibit is in place at another location or using other means if the start-up inhibit is deactivated by setting S_StartReset = SAFETRUE. Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING

NON-CONFORMANCE TO SAFETY FUNCTION REQUIREMENTS

Verify the impact of a deactivated start-up inhibit (S_StartReset = SAFETRUE) on your machine or process prior to implementation.
Observe the regulations given by relevant sector standards regarding the start-up inhibit.
Verify that a suitable start-up inhibit is in place at another location or using other means if the start-up inhibit is deactivated by setting S_StartReset = SAFETRUE.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING
	NON-CONFORMANCE TO SAFETY FUNCTION REQUIREMENTS Verify that a start-up inhibit facility is implemented in your safety-related network if required for your specific safety-related function according to the relevant standards. Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING
	UNINTENDED START-UP Validate the behavior of the function block and the safety-related network as a whole and thoroughly test the application. Failure to follow these instructions can result in death, serious injury, or equipment damage.