What is the function of an interlock in control systems?

An interlock in control systems serves the critical function of preventing specific conditions or actions from occurring simultaneously, which could lead to unsafe or undesirable situations. For example, in a manufacturing environment, an interlock might ensure that a machine cannot operate if a safety guard is not in place, thus safeguarding personnel from potential hazards. This preventive feature is essential in maintaining operational safety and integrity within automated processes.

While enhancing communication between sensors, monitoring actuator performance, and actuating emergency shutdowns are vital components of control systems, they do not directly address the primary purpose of interlocks, which is focused on ensuring that incompatible states or operations do not happen at the same time. This ensures a much safer operational environment by reducing the risk of accidents or equipment damage.