S_Acknowledge input
State-controlled input for the status feedback of the connected safety-related periphery (confirmation message).
Data type: SAFEBOOL
Initial value: SAFEFALSE
Connection: Connect this input to the feedback signal (confirmation signal) of the safety-related periphery, either directly or via other safety-related functions/function blocks. Constant SAFETRUE or SAFEFALSE values are not permitted.
If the function block is activated (Activate = TRUE), the possible values at this input lead to the following function block behavior:
| Value | Description |
|---|---|
| TRUE | The connected safety-related periphery signals execution of the safety-related function. |
| FALSE | Feedback of the connected safety-related periphery about execution of the safety-related function is not present. |
Single-channel or two-channel feedback signal from the periphery?
Irrespective of whether there is a single-channel or two-channel feedback signal between the safety-related periphery and the Sicherheitssteuerung, the S_Acknowledge input is only connected to one signal.
A two-channel signal must be evaluated or monitored as follows:- Either through a suitable upstream function block, e.g., SF_Equivalent, if the connected periphery has two N/C contacts.
- Or the evaluation of equivalence or antivalence must be performed in the safety-related input device.