RobotStudio event

Warning before items exit

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I am programming a line and the PLC programmer came to me with a need regarding the Start/Stop conveyor function of Pickmaster. I would like to know if you can help me with this.
We use the Start/Stop signal on an infeed conveyor (pick) and outfeed conveyor (place). We have other equipements on the line and they cannot stop easily. We will use the start/stop signal of the conveyor but we would like to have also other signals if the targets (pick or place) are close to the exit (ref. Pickmaster User's Guide p.82). We would like to use this signal to speed down the conveyors before to stop them.
Do you have any idea how can I get this informations on items in the Pick or Place Queue?
Thanks for your help,
Nick B.