Beckhoff CX5020 PLC program not work

[derickloo 0]

I face an issue with Beckhoff CX5020 controller. The controller attached with EL3403. I load the plc code into the controller and use my C# program to read the value. It's work fine but when I restart the CX5020, my C# program can't read any value and complain the symbol not found. I need to re-run the plc code by login -> Run then my C# program can get the value. Every time restart the controller, I need to re-run the PLC code. I have create a boot project and set it run mode but it's still the same. Any one have an idea what setting I have miss out? Please guide me, thanks

[JYG 13]

When you activate your configuration, a dialog display an option "Autostart PLC Boot Project". You must check it.