Implementation of safety requirements from applicable standards

The safety-related function block has been developed according to the safety requirements (from applicable standards) listed in this section. All other requirements from these standards must be observed when implementing the safety-related function.

This section describes either how the function block meets the requirements of the standards or what measures need to be taken to meet the requirements of the standards.

Standards Context/Requirement Implementation

EN ISO 12100-2 Start-up after failure of supply voltage/spontaneous restart The function block supports a start-up inhibit and/or restart inhibit of the function block after

start-up of the Sicherheitssteuerung or activation of the function block (S_StartReset = SAFEFALSE)

deactivating of the emergency-stop control device (S_AutoReset = SAFEFALSE)

You are responsible for planning and implementing the start-up/restart behavior according to your risk analysis. To prevent an unintended start-up/restart, you may need to perform an additional function start once the safety-related function has been reset. This will depend on both the results of the risk analysis and the signal path of the reset signal.

EN ISO 13849-1 Manual reset device The Reset input supports the function of a manual reset device.

Hinweis
Resetting does not occur with a negative (falling) edge, as specified by standard EN ISO 13849-1, but with a positive (rising) edge.
To implement the reset with a falling edge (with regard to the mandatory acceptance procedure), use the safety-related function block SF_Reset.

EN ISO 13849-1 Category B to 4 Single-channel or two-channel connection must be established depending on the category.

Hinweis
Cross-circuit monitoring is not performed by the function block. It is your responsibility to implement this monitoring function outside of this function block in the safety-related control system. For example, an Equivalent function block must be connected upstream for the purpose of evaluating signals if a two-channel emergency-stop control device with two N/C contacts is used.

ISO 13850 Positive opening operation Only use approved emergency-stop control devices which conform to standard ISO 13850.

ISO 13850 Priority of emergency-stop When connecting the emergency-stop signals, you must ensure that the emergency-stop command has priority over all other commands and is processed in every Sicherheitssteuerung cycle.

ISO 13850 Restarting You can select whether the function block will support automatic restart or a restart inhibit after the emergency-stop control device has been deactivated.

ISO 13850 Emergency-stop function When the manual control has been activated, the emergency-stop device must operate in a way that ensures danger is automatically negated or reduced as effectively as possible.

Hinweis
It is your responsibility to implement this function outside of this function block in the control system.

ISO 13850/EN 60204 Requirements of electrical emergency-stop equipment The emergency-stop equipment you use must meet the requirements of the relevant standards.

ISO 13850 Requirements of emergency-stop devices It is your responsibility to meet the requirements of this standard, according to the risk analysis you carried out.

ISO 13850 Using wires and cables as manual controls It is your responsibility to meet the requirements of this standard, according to the risk analysis you carried out.

EN 60204 Stop functions The function block (S_EStopOut enable signal) executes stop category 0.