Posted 30 Apr 2014 The first problem was SCREEN DATA ERROR then i erased the screen data and download the screen programe using nt transfere utility NTST4.1E and the screen system version is 4.1 then when i start screen after connection with its plc the programe appears only one second and th the message CALENDAR DATA ERROR appears i tried to change the date and time but it dose not accept changed Share this post Link to post Share on other sites