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FWS 1205Fail-To-Safe Standstill MonitorsSafety Category (EN954-1):Features• Confirmation of standstill using 2 impulsesensors• Control Category 3 to EN 954-1• Operational voltage 24 VDC• Reset input• 2 short-circuit proof semiconductor outputs• Integral System Diagnostics (ISD)• 2 channel microprocessor control• Customer-specific standstill frequenciespossible• 2 enabling pathsDimensions22.5 x 75 x 110 mmISDThe following faults are recognized by the safetycontroller and indicated by means of ISD• Interruption of the connections to one of theinductive proximity switches• Failure of the proximity switches• Failure of one channel being evaluated• Failure of the unit’s internal safety relay to pull-in ordrop-out• Faults on input or relay control circuits of the safetycontrollerModelDesignationFWS 1205A-24VDC (Execution A)FWS 1205B-24VDC (Execution B)FWS 1205C-24VDC (Execution C)StandstillFrequenciesExecution A Execution B Execution CFunctionTableAdditionaltransistor output YFunction ofoutput YInput X1 1Hz 2Hz 1HzInput X2 2Hz 2Hz 1HzY1Enable, Enablingcircuits closedY2FaultApprovals BG UL CSA76