Import from personal message:

gujaa

Dear Mr.,

Do you have a time to help me, step by step about profibus configuration between 2 plcs?
I'm really hurry about that project and I would be thanksfull a lot.

Thank you for thread.

I'm working on profibus communication between 2 same PLCs S7300 (with CPU315F-2PN/DP and CP 343-2). My PLC does not dirrect support profibus like some others, so I have to add profibus communication by the MPI/DP.

I don't know how to set CP (communication processor) because it's not in profibus submenu in hardware configuration catalogue and I couldn't find any similarly example.

However, my profibus connection is not succesfully completed. Led BF1 on master PLC is on.

I hope you will help me people.

Thank you a lot.

Best regards.

Hi,

please check the following FAQ:

DP link between CPU 315-2DP (slave) and S7-400 (master) with STEP 7 V5.3

 Hope this helps!

Regards,

Towome

Towome

Hi,

please check the following FAQ:

DP link between CPU 315-2DP (slave) and S7-400 (master) with STEP 7 V5.3

 Hope this helps!

Regards,

Towome

 I follow this instruction, with my plc module tags of course. Result is SF led on, except BF which is already on. There is not at all used CP like in other examples. Does somebody know something about that? I set same adress in step for configuration DP Slave properties like in this example. Is that mistake?

Please help.

Gujaa

Here is Diagnose.txt from cpu diagnostic buffer, screen shots of master and slave hw configuration, picture of my PLC and complet Simatic project.

Please tell me where I made misstakes. 
Before this project I worked on profibus between this plc and ET200M device and it was well done, but I now have many twistings.

Please help.

 Hello,

in your photo of the CPU seems that you have the terminating resistor of the Profibus plug OFF why? You have only one Profibus cable right? 

@Ste39:  Chapeau! good eye sight!

@Gujaa:  This could be the reason, why it doesn´t work.

You have to switch the termination of the Profibus-Plug to "ON" at the first and the last device in daisy chain.

hope this helps,

regards,

Ste39

 

Gujaa

Here is Diagnose.txt from cpu diagnostic buffer, screen shots of master and slave hw configuration, picture of my PLC and complet Simatic project.

Please tell me where I made misstakes. 
Before this project I worked on profibus between this plc and ET200M device and it was well done, but I now have many twistings.

Please help.

 Hello,

in your photo of the CPU seems that you have the terminating resistor of the Profibus plug OFF why? You have only one Profibus cable right? 


It's ON all the time. I have one profibus cable and on both side plugs are ON.

mopS04

@Ste39:  Chapeau! good eye sight!

@Gujaa:  This could be the reason, why it doesn´t work.

You have to switch the termination of the Profibus-Plug to "ON" at the first and the last device in daisy chain.

hope this helps,

regards,

 

 It's on all the time... :(