S7 - ProfiNet Status

Permanent Beginner · Feb 12, 2013

Hello
I was wondering if anyone could help me? My question is;
Is there an easy way to discover if a remote ProfiNet station is online or not.

I have used OB86 to flag any changes in status, but this doesn’t work if the profinet device is offline when the cpu was powered up as there is no change in status, so no OB is called.

I just need something simple to determine if a ProfiNet device is healthy at least once after start-up. I can see the BF light flashing, but not sure how to read its status in my program.

Thank you

Mike_RH · Feb 12, 2013

Use SFC 51 (I think), Read sys status.

adfox · Feb 13, 2013

Look for FB125/FB126 on siemens site.

One is for ProfiBus the other one for Profinet.

Here it is:
https://support.automation.siemens....objaction=csview&extranet=standard&viewreg=WW

JesperMP · Feb 13, 2013

Use FB126. It is the most recent and is for both Profibus and Profinet.

Permanent Beginner · Feb 13, 2013

Is there a reason why FB126 is not in my standard library?
I am using Step7 V5.5 sp2, am I missing an update?

JesperMP · Feb 13, 2013

It is not just a program block.
It is a complete sample project.
Use the link by adfox to get it on your PC.

Permanent Beginner · Feb 13, 2013

Ok, I installed the libraries from the project and now have PNIODiag in my library. If I double click on the FB126 block I get this (see image) in my program.
In the brief instructions how to use the block, it says that there is an instance DB126 for the storage of the statuses, etc. When I try to insert DB126 in my project, I get an error box with no message in it. When I first tried to create the instance DB the error said something about “ASCII not being available from FB126”, then every time since the message was blank.
I am assuming that the three red ??? are expecting me to enter DB126 or do I enter the other DB200 described?

TurpoUrpo · Feb 13, 2013

Has anyone used SFM?

Permanent Beginner · Feb 13, 2013

All I am trying to do is turn a bit on/off in my program to flag that the Profinet module is healthy/faulted (including missing from start-up).

JesperMP · Feb 13, 2013

Permanent Beginner said:
Ok, I installed the libraries from the project and now have PNIODiag in my library. If I double click on the FB126 block I get this (see image) in my program.
In the brief instructions how to use the block, it says that there is an instance DB126 for the storage of the statuses, etc. When I try to insert DB126 in my project, I get an error box with no message in it. When I first tried to create the instance DB the error said something about “ASCII not being available from FB126”, then every time since the message was blank.
I am assuming that the three red ??? are expecting me to enter DB126 or do I enter the other DB200 described?

No idea what goes wrong. Maybe the symbol connection to the DB you specify is bad. You can try and open the symbol table and manually clear the DB from the table.

Normally you can specify any DB. Try an unused DB number. STEP7 will ask to create it. Say yes to that. Then add a symbolic name to the DB.

Another way is to copy-paste all the relevant blocks from the sample project to your project. That will only go smoothly if the FBs and DBs have not been used in your project already.

Permanent Beginner · Feb 13, 2013

Thanks Jesper, that worked (see image).
Two questions remain;
1. Do I need the DB200 described, if so where do I tell FB126 to use it?
2. What do the IN0 and OUT1 represent?

Thanks again for your help.

JesperMP · Feb 13, 2013

If you select FB126 and hit F1, an online help will open.
IN0 should be the number of the global DB used for diagnostics data. If you leave it empty, it will assume DB200. If DB200 does not exsit, it will be created (according to the online help).

Permanent Beginner · Feb 13, 2013

Yes you are correct as always. The bit I missed was that FB126 needs to be present in OB100, this is where it is initiated and the DB200 is set-up. Here are the results;-

In my Profinet IO system 100, the word at byte position 1642 of DB126 reflects the state of the Profinet system. There is a 15 second delay before the DB is updated.
DB200 reflects the same code as above but with separate words per station. Word 0 went to #108 when I unplugged station 1 and word 1 for station 2, etc. Again, there is a 15 second delay before the DB is updated.

Not as simple as I had hoped but its a solution that works!
Thanks all :site:

S7 - ProfiNet Status

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