Functional description

The SF_ESPE function block monitors the switching states of electro-sensitive protective equipment (e.g., a light curtain or light grid) and executes stop category 0 at its output. S_StartReset and S_AutoReset can be used to specify a start-up inhibit and a restart inhibit.

NOTE:

This documentation refers to the electro-sensitive protective equipment as ESPE for short.

Triggering the ESPE

When the connected ESPE triggers, the function block ensures that the enable signal at the S_ESPE_Out output switches to SAFEFALSE. The process being controlled is stopped.

Start-up inhibit (S_StartReset)

S_StartReset is used to specify the start-up inhibit after activating the function block and/or starting the Safety Logic Controller.

S_StartReset = SAFEFALSE	After the Safety Logic Controller has been started up and/or the function block has been activated at input Activate, the start-up inhibit is active. The start-up inhibit is only removed if there is a positive signal edge at the Reset input. Refer to the hazard message below this table.
S_StartReset = SAFETRUE	After the Safety Logic Controller has been started up and/or the function block has been activated at input Activate, no start-up inhibit is active. Refer to the section "Attention when using ...".

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

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.

Restart inhibit (S_AutoReset)

S_AutoReset is used to specify the restart inhibit that is active when the connected ESPE that was previously triggered is no longer triggered (as the light curtain or light grid, for example, is no longer interrupted).

S_AutoReset = SAFEFALSE	Once the ESPE that was previously triggered is no longer triggered, the restart inhibit becomes active. The restart inhibit is only removed if there is a positive signal edge at the Reset input. After the restart inhibit has been removed, the status at the S_ESPE_Out output can switch from SAFEFALSE to SAFETRUE. Refer to the hazard message below this table.
S_AutoReset = SAFETRUE	The restart inhibit is not specified. As soon as the ESPE that was previously triggered is no longer triggered, and the value SAFETRUE is present at the S_ESPE_In input again, the S_ESPE_Out output automatically switches to SAFETRUE. Refer to the section "Attention when using ...".

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

WARNING
	UNINTENDED START-UP Verify the impact of removing the restart 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 restart inhibit. Do not enter the zone of operation when removing the restart inhibit. Ensure that no other persons can access the zone of operation when removing the restart 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 restart 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 restart inhibit.
Do not enter the zone of operation when removing the restart inhibit.
Ensure that no other persons can access the zone of operation when removing the restart 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.

Attention when using S_AutoReset = SAFETRUE and/or S_StartReset = SAFETRUE

The start-up inhibit and/or restart inhibit must only be deactivated if it is certain that starting up/restarting the machine/system will not lead to a hazardous situation or that a suitable start-up/restart 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) and/or restart inhibit (S_AutoReset = SAFETRUE) on your machine or process prior to implementation. Observe the regulations given by relevant sector standards regarding the start-up/restart inhibit. Verify that a suitable start-up inhibit is in place at another location or using other means. 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) and/or restart inhibit (S_AutoReset = SAFETRUE) on your machine or process prior to implementation.
Observe the regulations given by relevant sector standards regarding the start-up/restart inhibit.
Verify that a suitable start-up inhibit is in place at another location or using other means.

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