S_ESPE_In input

NOTE:

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

This state-controlled input evaluates the state of the ESPE connected to the function block (e.g., whether a light grid/light curtain is interrupted/not interrupted).

Data type: SAFEBOOL

Initial value: SAFEFALSE

Connection: Connect this input to an ESPE connected to the Safety Logic Controller, either directly or via other 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	ESPE has not triggered (normal operation). Refer to the hazard message below this table.
SAFEFALSE	ESPE has triggered (or the wiring to the ESPE is interrupted or the ESPE is inoperable). The S_ESPE_Out output is switched to SAFEFALSE.

You can set a restart inhibit via S_AutoReset in order to control the restart behavior of the function block following a signal change from SAFEFALSE to SAFETRUE at the S_ESPE_In input (i.e., after the light grid that was previously interrupted is no longer interrupted).

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

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

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

Single-channel or two-channel connection of the ESPE?

Irrespective of whether there is a single-channel or two-channel connection between the ESPE and the Safety Logic Controller, the S_ESPE_In input is only connected to one signal of the ESPE.

When using a two-channel ESPE, the two-channel signal must be evaluated or monitored as follows:

Either through a suitable upstream function block, e.g., SF_Equivalent function block, if the ESPE has two N/C contacts.
Or the evaluation of equivalence or antivalence must be performed in the safety-related input device (see also section Application example).