How to send a robot in motion to A-B PLC

How can I set up a robot in motion tag to an allen bradley plc using an ethernet/ip anybus adapter in robot studio

Do you actually need robot in motion or would task executing or cycle on be sufficient? There are system outputs available for those two things.

robot in motion. If the robot is in a wait command would that count as task executing?

Yes, it would.

If omnicore controller you can use inverse system output “Mecanical unit not moving”