All channels suddenly passivated

Hello,

We are using CPU 1515F-2 PN with two ET200SP IO stations and around 10 F-DI's and 2 F-DQ's.

Never had we problems with anything, but with one particular CPU we sometimes had that everything went into a passive state for no reason (3 times in 1 month). I was wondering, do I increase the F-CPU monitoring time from 150ms to 250ms?

Thank you

Hi STanger,

Can u share diagnostics buffer?

Check the SMPS, earthing voltage. Ensure voltage levels are within limits.

Hello,

Thank you for your response.

Unfortunetely I did not have the chance to look at the buffer since the CPU is used for production. But I also have not checked for any voltage leakages which may cause all the safety modules to enter the passivied state? Right?

STanger

Unfortunetely I did not have the chance to look at the buffer since the CPU is used for production. 

You can look at the diagnostics buffer, even if the machine is in production.