In industrial automation, the words permissive and interlock are often used as if they mean the same thing.
They do not.
Both are conditions that influence whether equipment is allowed to operate, …
Read MoreBuilding Professional and Industrial Ladder Logic with State Machines, Subroutines, and Status Codes
In a basic PLC program, it is common to organize the logic using a simple structure:
Input BufferingMode SelectionRequestsPermissivesInterlocksCommandsFault …
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