According to discussed with PTTGSP ( PTTPLC) customer , he have plan to upgrade PLC system (GSP5). For the point that I would to inform to you the exiting communication between GSP5 and GSP3 via " Profibus DP Fiber Optic" For the futher , Customer maybe upgrade GSP3 , that easier to cheer up for revoke Profibus and replace by Wifi . I think this is the good time for you to present Wifi portfolio with them for alternative solution.