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2. Trapped-key interlocking - Wikipedia

   en.wikipedia.org/wiki/Trapped-key_interlocking

   Manufacturers of trapped-key interlock devices provide application guides showing typical interlock problems and recommended arrangements. Since the reliability and safety of the scheme critically depends on the possession of keys, duplicate keys must be carefully controlled to prevent any possibility of an unsafe operating sequence.

3. Interlock (engineering) - Wikipedia

   en.wikipedia.org/wiki/Interlock_(engineering)

   Trapped-key interlocking is a method of ensuring safety in industrial environments by forcing the operator through a predetermined sequence using a defined selection of keys, locks and switches. It is called trapped key as it works by releasing and trapping keys in a predetermined sequence. After the control or power has been isolated, a key is ...

4. AS-Interface - Wikipedia

   en.wikipedia.org/wiki/AS-interface

   This means that safety-related components such as emergency stop actuations, door interlocks or light grids can be used in the AS-Interface network. This is a different transmission protocol overlaid onto the regular ASi protocol on the same cable and requires a separate safety master such as Siemens ASiMon devices on which your safety devices ...

5. Machine guarding - Wikipedia

   en.wikipedia.org/wiki/Machine_guarding

   Electrical interlock mounted on wire mesh machine guarding. Electrical interlocks or other devices tied into the equipment's control circuit are mounted on access points and are configured to stop equipment operations when opened. These access points should also incorporate hardware to comply with the OSHA lockout/tagout regulation 1910.147. [6]

6. Industrial control system - Wikipedia

   en.wikipedia.org/wiki/Industrial_control_system

   An industrial control system (ICS) is an electronic control system and associated instrumentation used for industrial process control.Control systems can range in size from a few modular panel-mounted controllers to large interconnected and interactive distributed control systems (DCSs) with many thousands of field connections.

7. Safety instrumented system - Wikipedia

   en.wikipedia.org/wiki/Safety_instrumented_system

   In functional safety a safety instrumented system (SIS) is an engineered set of hardware and software controls which provides a protection layer that shuts down a chemical, nuclear, electrical, or mechanical system, or part of it, if a hazardous condition is detected.