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S_ESPE_In input

Hinweis
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 Sicherheitssteuerung, 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:

ValueDescription
SAFETRUEESPE has not triggered (normal operation).

Refer to the warning below this table.
SAFEFALSEESPE 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.

WARNUNG
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.

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 Sicherheitssteuerung, 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: