Hello,

I have an application with CPU 1214C with 13 MM440's on USS. I need to know, why USS_PORT gives me an error 818B? USS is connected by profibus cable and resistors are connected on both sides. First time i used my own block for communication. Then i use siemens standard block but with the same problem.

Any idea?

Thanks

Hi

in the Step 7 TIA manual is a descrition of Error16#818B but in my opinion not paticulary helpful:

"The drive is not responding -> check thr drive"

Maybe that still helps a bit,

Regards,

Towome

Hi

of course that I open this help.  I also find some PDF where it is described as "For example, if the network is not properly terminated then it is possible for a drive to go to RUN but the USS_DRV instruction will show all 0's for the output parameters." ( that is what happenning to me. USS_PORT calling fault 818B and USS_DRV write 0 to every received bytes) pages 614-615. 

There you can find it :
https://support.industry.siemens.com/cs/document/36932465/simatic-s7-s7-1200-programmable-controller?dti=0&lc=en-WW

But nowhere is any solution of this fault...

Any idea?

Hello, I have a same problem with communication between S-1200 and Sinamics V20

Here is the settings of V20:

macros Cn010 - USS Control

P2010 = 8 (38400)

P2011 = 1 (adress)

P2012 = 2 (PZD)

P2013 = 4 (PKW)

P2023 = 1 (USS)

The S-1200 (TIA v13) program is very simple and consists of 2 OB - Cyclic Interrupt (120 ms) with USS_PORT block and Main with USS_DRV. (see the pic in attachment)

USS_status is 818B, Tx indicator on CB-1241 blinking, Rx - not. Physically connection is OK...

I haven't idea what is wrong, help please

Thanks!

Refer this link.

https://support.industry.siemens.com/cs/document/37604154/simple-networking-and-cascading-of-drives-(set-8)?dti=0&lc=en-WW

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William_B

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