S_PSE_In input

Hinweis
This documentation refers to the monitored pressure-sensitive protective equipment as PSE for short.

This state-controlled input evaluates the state of the PSE connected to the function block (e.g., whether a safety mat, safety panel, safety edge or switching strip has been triggered or not).

Data type: SAFEBOOL
Initial value: SAFEFALSE

Connection: Connect this input to a PSE 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:

Value Description

SAFETRUE PSE has not triggered (normal operation).
Refer to the warning below this table.

SAFEFALSE PSE has triggered (or the wiring to the PSE is interrupted or the PSE is inoperable).
The S_PSE_Out output is switched to SAFEFALSE.

Value	Description
SAFETRUE	PSE has not triggered (normal operation). Refer to the warning below this table.
SAFEFALSE	PSE has triggered (or the wiring to the PSE is interrupted or the PSE is inoperable). The S_PSE_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_PSE_In input (i.e., after the safety mat that was previously stepped on is no longer stepped).

If no start-up/restart inhibit has been specified for the function block, the SAFETRUE status at the S_PSE_In input can cause the S_PSE_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_PSE_Out output after applying the SAFETRUE status to the S_PSE_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_PSE_In input.

Use appropriate safety interlocks where personnel and/or equipment hazards exist.

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

Irrespective of whether there is a single-channel or two-channel connection between the PSE and the Sicherheitssteuerung, the S_PSE_In input is only connected to one signal of the PSE.

When using a two-channel PSE, 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 PSE 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).