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S_EStopIn input

This state-controlled input evaluates the state of an emergency-stop control device (activated or not activated) connected to the function block.

Data type: SAFEBOOL
Initial value: SAFEFALSE

Connection: Connect this input to an emergency-stop control device 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
SAFETRUEThe emergency-stop control device is not activated (normal operation).

Refer to the warning below this table.
SAFEFALSE The emergency-stop control device is activated (or the wiring to the emergency-stop control device is interrupted or the emergency-stop control device is inoperable).
The S_EStopOut 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_EStopIn input (i.e., after the emergency-stop control device has been deactivated).

If no start-up/restart inhibit has been specified for the function block, the SAFETRUE status at the S_EStopIn input can cause the S_EStopOut 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_EStopOut output after applying the SAFETRUE status to the S_EStopIn 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_EStopIn input.
  • Use appropriate safety interlocks where personnel and/or equipment hazards exist.

Single-channel or two-channel connection of the emergency-stop control device?

Regardless of whether there is a single-channel or two-channel connection between the emergency-stop control device and the Sicherheitssteuerung, the S_EStopIn input is only connected to one signal of the emergency-stop control device.

When using a two-channel emergency-stop control device, the two-channel signal must be evaluated or monitored as follows: