Siemens SIMATIC S7 Manual page 26

OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3
3. The output IDENT_CODE shows an 18 character string
Copy this string per copy/paste from the DB und and insert it in the
form IT4Industry SOFTWARE REGISTRATION FORM. This form is
stored in the library path
..\Program Files\Siemens\Step7\S7LIBS\Modbus_TCP_CP
during installation and is also available on the installation CD.
Insert the License-No. of the product package into the form.
4. Please send the form per e-mail to IT4Industry
it4.industry@siemens.com.
Hereupon you will receive the registration key for your PLC.
Please note: No ident code can be displayed as long as an initialisation error
exists. Evaluate the output STATUS and correct the parameterization.
Licensing
4-2