Siemens CPU 319F-3 PN/DP

MHennel

Member
Join Date
Jun 2002
Location
Cincinnati, OH
Posts
64
I have two project sites that have several CPU-319F-3 PN/DP PLC's installed on various material handling systems. In the last two months I have add errors on them were all of the status LED's on the PLC are flashing and there is message in the diagnostic buffer that reads[FONT=&quot] “DEFECTIVE: Internal System Error’ [/FONT] At one site it has happened to all five PLC's at the same time. This has happened twice in the last two month. On another site it has happened to two of the four PLC's but at different times. Here is a screen shot of the PLC version number. Has anyone else had an issue like this

PLC.png
 
Since it happens to several PLCs at the same time, it must be something external that causes it to happen.
Could it be caused by lightning strike ?
Is the earthing good enough ?
If the various PLCs are interconnected with each other, or other distributed panels or nodes, does everything have a proper equipotential earthing (not the same as common earth !).
 
Jesper, I am having my guys onsite check the grounding. On one site that is a distinct possibility as the electrical installation is not good. On the other site there was some lighting in the area at the time, but on the second occurrence I do not believe there was. Also on this site we have installed UPS's on the PLC's
Kalle, Yes they are all running the same version of firmware. So far Siemens has not been able to provide and real information on what might have caused it, other than a problem with the boot loader.
 

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