Flashing twice DC5V and then all LEDs (S7-319-3PN/DP)

HI, all

What could it be ??? (below is the link to the video disc)

Fault_S7_319-3PN/DP_08112019

(I don’t want the whole Internet to see it (only Siemens forum)

Maybe some kind of fuse was blown there ??? Maybe the problem is related to power supply? can it be? (tried to connect to another power source, nothing helps ...) 

I will be waiting for your answer...

The moderator, please do not scold for creating a seemingly similar topic (in other branches, not quite similar problems ...)

Have you followed these steps S7300 and MMC reset

If you do have new empty memory card try with that one. 

You are sure that voltage supply is OK? 

First thing would be to isolate whether it is hardware problem. Disconnect everything beside CPU even IO devices with profibus, and place inside brand new empty MMC. 

Looks like you are having a great time on commissioning!!! 

And don't format the MMC at the PC.

How do you format or reset an MMC (Micro Memory Card) for SIMATIC S7-300 CPUs?

I didn't insert a new flash card, and there’s no sense in this operation, if without it PLC blinks anyway

SOble

Have you followed these steps S7300 and MMC reset

If you do have new empty memory card try with that one. 

You are sure that voltage supply is OK? 

First thing would be to isolate whether it is hardware problem. Disconnect everything beside CPU even IO devices with profibus, and place inside brand new empty MMC. 

Looks like you are having a great time on commissioning!!! 

 Yes. I checked the supply voltage is ok.

dchartier

Hello Unreality;

This does not look good for your CPU 319-3PN/DP.

I doubt that there is a fuse on the 5VDC connection; if there is, it would be on the circuit board of the CPU, normally a small Solid-State fuse was installed to protect the 24 V line in case 230 VAC is applied to the PLC (at least on the older S7-300s). I would not recommend opening the plastic cover of the CPU, unless you are willing to work with a no-longer-guaranteed unit.

Have a look at chapter 10 (Debugging functions, diagnostics and troubleshooting) in the following document (see the attachment below) and study the recommendations in this discussion :

SIMATIC S7-300 CPU 31xC and CPU 31x: Installation

https://support.industry.siemens.com/cs/ww/en/view/13008499

CPU 319 Not Responding, all LED are on constantly

https://support.industry.siemens.com/tf//ww/en/posts/cpu-319-not-responding-all-led-are-on-constantly/39157/?page=0&pageSize=10

Hope this helps,

Daniel Chartier

dchartier,

I read the topic that you attached ... This is a similar situation, but not quite the same as mine ...

If you watched a video,first one LED DC5V blinks two times, then all at once, and this repeats once of second ...

When I had the opportunity to connect to the PLC, I unfortunately did not save the service data. However, I was able to detect this controller only by MPI (there was a device with address 1), but then there was nothing further, only messages like: "Online connection aborted"

I think I would not be able to save service data, in this situation (((

someone is already selling, on ebay a similar controller)))

Siemens Simatic 6ES7318-3EL00-0AB0 S7-300 Cpu 319-3 Pn/DP 6es7 318-3el00-0ab0

i sent support request...

I think the answer will not be fast)))

*****************************

Nine days have passed since contacting technical support ... They sent me a confirmation email that the application was created, but I do not see its status. So it should be?)))

Hello ALL,

Generally:

Support from Siemens not answered me - however, there is only a radical solution to the problem:

Buy new controller

See the topic below - there has already been a conversation about a similar problem

CPU319-3 PN/DP fault

The problem really lies with the processor (short circuit).

As it turned out, this topic exists on the Internet.

And I will tell you honestly - I'm not sure that I have the exact same situation - however, the controller symptoms, speak for themselves - this is not the only case of failure of this particular PLC version (the first revision was made from 2008 to 2011).

*******

What I did:

1. I made out the controller to little parts
2. Got to the processor
3. I tried to warm up the processor in order to temporarily restore the connection in it.
4. But all the attempts were unsuccessful

As a result, a new PLC was purchased.

It seems to me that Siemens knows about this problem, because the lifetime of the very first PLC revision was very short (my opinion).

Most likely there were problems with overheating inside the PLC. The thermal interface between the processor, heatsinks and all the connections is practically absent - that is, you will not see the gum or thermal grease inside like laptops.

*******

I hope the owners of these PLC series - the information above will be useful.

The topic is closed!