Interfacing PLC to an arduino

Hi Guys,

I am doing my final year project using PLC. I want to connect a 5V servo motor as an output to the PLC ( http://www.ab.com/programmablecontrol/micro/micro800/get/virtualbrochure/EN/micro830.html ).

The only way I realized this could be possible is through a arduino board. Am I right or is there another way?

If this is the way, how do you interface the PLC and arduino such that the arduino is an output of the PLC?