Interlock

The interlock banner of a unit panel, its states, the manual rearm and its permission.

The Interlock banner shows the live stop-interlock status of a unit and offers the manual rearm (see Automation for what a stop interlock is and how it ends runs). It is a part of the unit panel, not a component: the panel draws it above its cards, for its own unit, while the unit's model has its stop interlock enabled. It is never placed on a screen, and the dashboard's Add palette does not offer it, so there is nothing to configure.

What it shows

A healthy interlock is deliberately silent: in the Normal state the banner draws nothing and takes no room on the panel, so it claims the operator's attention only when something needs it.

Every banner carries the state's reason line plus the configured source's name, its current Boolean value (True, False, or the gap mark when it has none) and its quality (Good or Unavailable). The transient result of a rearm is written on the banner too.

Rearming

Rearm appears only in the awaiting-reset state. It is enabled while all of these hold:

• the physical source has cleared (the latest status says a rearm is safe),
• the unit is not busy with a run,
• no rearm call is already in flight.

While one of them does not hold, the button stays drawn, greyed.

The rearm is journaled with the name of the signed-in operator (or Not signed in), and the permission is rechecked at the moment of the press, never only when the panel was drawn.

Permission

Rearming takes the Run procedures permission, on the Process page and on the View page alike. A role without it still reads the whole banner, but the Rearm button is not drawn for it: that role can never rearm.