An interlock designator represents a single interlock.

<interlock designator>

──┬──────────────────────────────┬─────────────────────────────────────►
  ├─<connection block qualifier>─┤
  └─<structure block qualifier>──┘
►─┬─<interlock identifier>────────────────────────────────┬────────────┤
  │                                   ┌◄───── , ────┐     │
  └─<interlock array identifier>── [ ─┴─<subscript>─┴─ ] ─┘

When an interlock or interlock array is declared within a connection or structure block, you must use a connection or structure block qualifier to reference the interlock identifier or interlock array identifier from outside of the connection or structure block.