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2. Trapped-key interlocking - Wikipedia

   en.wikipedia.org/wiki/Trapped-key_interlocking

   The sliding bolt, when extended, mechanically prevents operation of a switch, valve, gate, or other device. Many variations exist, with different shapes of interlock bolt and multiple lock cylinders on an interlock. A significant feature of the interlock is that the key is held or trapped in one position of the lock.

3. 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]

4. 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 ...

5. 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 ...

6. IEC 61508 - Wikipedia

   en.wikipedia.org/wiki/IEC_61508

   IEC 61508 is an international standard published by the International Electrotechnical Commission (IEC) consisting of methods on how to apply, design, deploy and maintain automatic protection systems called safety-related systems.

7. Safety instrumented system - Wikipedia

   en.wikipedia.org/wiki/Safety_instrumented_system

   An SIS performs a safety instrumented function (SIF). The SIS is credited with a certain measure of reliability depending on its safety integrity level (SIL). The required SIL is determined from a quantitative process hazard analysis (PHA), such as a Layers of Protection Analysis (LOPA). The SIL requirements are verified during the design ...