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Siemens Industry Online Support
Siemens AG
Entry type: Application example, Entry ID: 21063946, Entry date: 09/08/2017
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Protective door with spring-loaded interlocking with an S7-1500

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  • Associated product(s)
To prevent access to the hazard zone of a machine during operation, a protective door is installed and the position of the protective door is monitored. Since overrunning machine components may cause hazards, the protective door is interlocked and can only be opened after the machine is in standstill.

Monitoring the position of the protective door is performed via two SIRIUS 3SE5 position switches to reach the demanded safety level. If one position switch fails, an opened protective door is still detected by the second position switch. A failed position switch is detected by the discrepancy monitoring in the controller, and switching it back on is prevented until the failure has been removed.




One position switch is equipped with interlocking. Apart from monitoring the position of the protective door, the door can be kept closed during operation and hence entry into the hazard zone be prevented.
To be able to switch on the machine, the protective door must be closed and locked. Unlocking the protective door is only possible at the end of a configured period of time, after the machine has been switched off, so the operator is protected against hazardous machine overrun motion.


Documentation and Example Project


Last Changes
Upgrade to TIA Portal V14
Replacement of decentral periphery with central modules


Additional Keywords
Safety, safety function, interlocking, safety switch, guard
Security information
In order to protect plants, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about industrial security, please visit
http://www.siemens.com/industrialsecurity.