LED Flashing on S7 1200 CPU

Contact Siemens Support via "Support Request" in the gray bar above these web-based forums.

If you have a S7-1200 compatible memory card (not a standard MMC/SD cards), you can "try" to insert it into the PLC and have it unload the PLC project to the memory card.  That might allow you to at least get online and load a less aggressive watch table project to the PLC.

300 is quite a bit.

Maybe break down the 300 into 20 or so per watch table.   After all, your eyes cannot see 300 at once anyhow.

mario.zf

S7-1200 (6ES7 214-1BG40-0XB0)

I have the same problem...

Steps until it die:

-> Update Firmware 4.1 to 4.2.

-> Downloaded program with WebServer and watch table 2000 variables type REAL (works perfectly).

-> Added more 2 DB's with 300 REALs each (works fine)

-> Added 2 watch table for this 300+300 variables

-> PLC crashs, i'm unable to download any program but it appears the option to connect and donwload but never do it till the end

-> Put the PLC in RUN mode and i'm not able to connect to it again.

-> Unplug and Plug and this starts with 3 leds flashing at all time (Unable to ping or download, even "online access" - networkcard - Update accessible devices doesn't show my S7-1200 anymore).