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MonitoringTime input

Specification of the maximum permissible response time between the request and confirmation of a safety-related function.

Data type: TIME
Initial value: #0ms

Connection: Connect this input to a time literal, i.e., to a constant of the data type TIME.

Once the request of a safety-related function is signaled by S_OpMode = SAFEFALSE (the S_SafetyRequest output forwards this to the connected safety-related periphery), the feedback signal at the S_Acknowledge input must become SAFETRUE within the response time specified here. Otherwise, the function block will output an error message (output Error = TRUE) and the S_SafetyActive output will be switched to the defined safe state (SAFEFALSE).

The time value to be configured depends on the safety response time of the functional safety system. The safety response time is the time between arrival of the signal at the input channel and output of the switch-off signal at the device output.

WARNUNG
Non-conformance to safety function requirements
  • Verify that the time value set at MonitoringTime corresponds to your risk analysis.
  • Be sure that your risk analysis includes an evaluation for incorrectly setting the time value applied to the MonitoringTime input.
  • Validate the overall safety-related function with regard to the set MonitoringTime value and thoroughly test the application.