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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.
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 ...
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 ...
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.
As such, safety relays monitor a specific function. When connected to other safety relays, they guarantee full monitoring of a plant or machine. [1] They meet the requirements of EN 60947-5-1, EN 60204-1 and VDE 0113-1. [5] Furthermore, there are many variants of safety relays, which are suitable for various machinery applications.
Switched-socket outlets with interlocks are described in IEC 60309-4 standard and are commonly used to enhance electrical safety in industrial plants. The interlock cuts power to the socket when nothing's plugged in and locks any plug in the socket until the power is turned off.