Automation & Control
Interlock
A condition that must be satisfied before an action is allowed, or that stops an unsafe/inappropriate action.
IN ONE SENTENCE
It links machine states so one operation depends on another.
In normal English
Interlocks can be implemented with PLC logic, relays or safety systems and are used for sequencing and protection.
Why would I use it?
Use it when equipment must only operate under defined conditions.
THINK OF IT LIKE…
A rule saying 'you cannot do this until that is safe and ready'.
Related terms
PLC, safety relay, permissive
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