s7 1200

hi friends i am doing project s71200 my project is data logging and viewing live trend in scada
i wrote ladder logic and finished scada block also when i am compiling the code in offline it shows 0 error
so i connect it to plc online when i am compling the code it runs but my scada input is not connect to plc when i am giving input in scada it does not goes plc vice versa i cant get any data from plc to scada
i dont know what mistake i did


please give some advice

What scada? and did you set block access to standard comp. with S7-300/400