This plugin is one of many that ads logic to your project. The Gate has 3 locks which can be locked and unlocked by separate triggers, controlling if data is allowed to pass through it.
The example below show a simple setup where the Gate plugin plays a central part of the flow. When the Twilight calendar is signaling the start of sunrise it unlocks lock number 1. This enables the PulseTriggers output signal to reach the start input of the lawnmower robot. The opposite goes for sunset: lock number 1 is locked preventing the lawnmower from receiving a start signal.
This below scenario could be expanded by letting a weather plugin controlling lock number 2, and an ordinary Calendar plugin controlling lock number 3.