Hello,
When i tried to download my modified program on the CPU 315-2 PN/DP, a message appeared asking " Do you want to replace the online system data with the offline one?" i choosed yes and i downloaded but not all program downloaded after that i found all the LEDs on the CPU are flashing and i can't comunnicate anymore.

& When i removed MMC card then it is communicating.

After that i replaced memory card by new one,  but same issue all led blinking after downloading program
I want to know the reason of this problem that i have?

Thanks in advance 

Hello,

souns like a internal FW Problem (SystemFault).

After removing the mmc and reboot go online and check the diagnostic buffer of the PLC for some error messages.

Which Ordernumber and which FW have the PLC?

Regards

Christoph

ChristophD

Hello,

souns like a internal FW Problem (SystemFault).

After removing the mmc and reboot go online and check the diagnostic buffer of the PLC for some error messages.

Which Ordernumber and which FW have the PLC?

Regards

Christoph 

FW v3.2

Please find the attachment

Hello,

ok and any error in the diagnostic buffer?
You can try a Update to FW 3.2.14 and show if the problem is fixed.

https://support.industry.siemens.com/cs/ww/en/view/40360647

Regards
Christoph