xceled
If the button on the airlock is pressed, the cycle will start and the door will open. This circuit emulates a button press, but at a distance from the airlock door. In this way the airlock door can be opened remotely, it is not necessary to press a button at the door, for example the blast door has no control panel at all.

Not clear what this does, can you elaborate further in your description? You indicate optional components but then don't show how they hook up or what they are used for.