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Establishing a Connection

The connection is established in several steps

  1. By means of a DCP identify request, the controller scans the network for a PROFINET Device with the defined station name.

  2. The controller uses a DCP set command to set the desired IP address of the PROFINET Device.

  3. The controller sends a connect request (RPC protocol) to the device. This request contains a list of submodules with which the controller wants to exchange data.

  4. The PROFINET Device compares the list of expected submodules with the actual available submodules. In the case of a deviation, the connect response contains the "Module-Diff-Block" with the non-matching modules.

  5. The controller transfers the configured parameters/settings of the submodules.

  6. The PROFINET Device applies the parameterization after a complete transmission to the internal logic (device application) and the hardware of the submodules. After the configuration is complete, the PROFINET Device uses the application-ready request to report to the controller about the readiness for data exchange.

  7. Both participants switch the status of the transmitted IO data to valid, provided there is no fault at the respective submodule.

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