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• Safety FBs in PLCopen_SF_V2_00 Library
• SF_ModeSelector
• ModeMonitorTime input

ModeMonitorTime input

Specification of the maximum permissible switchover time for switching the operating mode.

Data type: TIME
Initial value: #0ms

All inputs may show a SAFEFALSE signal simultaneously during the time set at ModeMonitorTime. After this, a simultaneous SAFEFALSE signal at S_Mode0 to S_Mode7 leads to an error (Error = TRUE).

If more than one operating mode is detected at the mode selector switch, this behavior immediately leads to an error.

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

WARNUNG

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

Background: For mechanical reasons, all contacts are opened simultaneously for a short period during switching of the mode selector switch. ModeMonitorTime is used to specify a time slot within which the switching operation of the mode selector switch must be completed, without the function block detecting this state (all inputs SAFEFALSE) as an error.