[?]: When I plug SM 331 the CPU312 STOP led ON

[alin_NST]

Hello,

I have a problem with CPU 312-1AE13-0AB0 and SM 331-1KF01-0AB0.

In my actual configuration I am using CPU312 with SM321 and SM322. The system is OK.
When I want to extend and plug into the rack SM 331 331-1KF01 the system is going down and all the led's (SF, DC5V, FRCE, RUN, STOP led) are going to ON.
I can't access the system at this point.

I tried also with OB122 but no result. The power supply I think is enough, 2.5A.
The MMC is 64 K and is clean and new. The bus connector is not the same for all cards? I used the same connector from DI and DO cards.

What could be the reason for that??

thanks,
Alin

[sania]

connect with system power off
it`s same front connector

[Umencho]

Basically there are need http://support.automation.siemens.com/W ... n/19350076
But in case of all leds is ON means CPU should be replaced after. What is it behavior after removing that module?