communication b/w PLc V1040 and raspberry pi

i so far finished my ladder programming in unitronics V1040 plc and created a webpage to use in raspberry pi to view the same HMI screen in my webpage at the same time whatever output i get from the Plc HMI. now i hv the problem is, how can i communicate plc and raspberry pi.can i connect the i/o and o/p of both plc and raspberry pi . is any coding ive to write in the raspberry pi terminal for the communicate with plc. please advice me