What function does an "interlock" serve in a control system?

An interlock serves a critical safety function in a control system by preventing equipment from operating under unsafe conditions. It acts as a safeguard that ensures certain predetermined criteria or conditions are met before allowing a particular operation or process to proceed. For instance, an interlock might require that a guard is in place, that a certain temperature is reached, or that a warning light is off before enabling the system to operate. This functionality is vital in protecting both personnel and equipment by avoiding catastrophic failures or hazardous situations.

Understanding this role underscores the importance of interlocks in industrial settings, where the risk of accidents can be significantly mitigated through appropriate control measures. Thus, the purpose of an interlock is fundamentally linked to the safety and reliability of operations within a control system.