What does the error code 80CE mean in a Modbus communication?

Hello.

• Does this TIP exclusively apply to Modbus/TCP or any Ethernet based communications?
  
  
• Is the resource number marked in the image the identity to be used to create the communications link? Or can it be any of the 4 resource numbers mentioned?

My findings are different than what is marked in the above image. Please view the attachment. Through experimentation, I have determined which resource number I should use for my project. What I expected to work (lowest resource number) did not work.

Are there some guidance on which resource number should be used for which condition? Specifically to the Ethernet port that has many resource numbers.

Regards.

 Hi,

when you insert 80CE in search field of the online help/manual, you need to select the proper tag of the results. MB_SERVER calls TCON and 80CE from TCON means "invalid IP address".

Here in the forum are already threads regarding 80CE. Use the search function in the communication/networks directory to find them.

Refer this post for complete details here

Regards

SIMATIC International Technical Support Hub

For example, a Modbus station is connected to a SIMATIC S7-1500. The communication is programmed and yet the CPU does not establish a connection to the Modbus station.

The status of the module is queried and the result is an error code with the designation 16#80CE.

Solution:

The error code is output if the HW ID on the module was specified incorrectly.

The HW ID can be found in the device view under the tab "System constants".

Further information on the system constants can be found in the SIOS portal:

What is the significance of the system constants in STEP 7 (TIA Portal) for the S7-1200/S7-1500?

Best regards,

SIMATIC International Technical Support Hub.