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# | Title | User Story | Importance | Notes |
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1 | Investigate if PROFINET standards are available | To streamline the development and reduce the amount reverse engineering that needs to be done, we should investigate if the PROFINET standards are available at a reasonable price. | Medium | |
2 | Setup a test development environment | The driver will need to be tested thoroughly across a number of devices. Having as many devices available would be helpful High | High | Codesys Runtimes are being used as the controller and device. Captures of the discovery process, connection setup and IO transfer have been captured. |
3 | Implement a Proof of Concept | To confirm that there are no underlying issues that would stall the project, a proof of concept should be put together to confirm the performance is acceptable | High | During the discovery process each device identifies itself, this information is used to lookup a GSD file, this information is then used to create a connection. Once the connection is established then the IO transfer begins, and the GSD file once again is used to decode the IO data field. |
4 | Implement Read Functionality | To be able to obtain data from the field device reading functionality should be implemented. This would match with acyclic communication. | Medium | |
5 | Implement Write Functionality | To be able to update data with the device write functionality should be implemented | Medium | |
6 | Implement Subscription Functionality | The PLC4X API includes both read and subscription functions. The read function requires that the user sends each request, whereas the subscription functionality requires the user to setup a continuous monitoring list where callbacks are used to notify the user of any tag updates that arrive. This matches with cyclic communication | High | |
7 | Continue work on the Discovery Functionality | To be able to detect any devices on the network a discovery function has been created, work should continue on this. This will more than likely just be testing this function with other devices. | Low | |
8 | Test the Driver | To confirm the driver is compatible with other devices, testing should be completed with as many devices | High | |
9 | Investigate the use of GSD files in configuring the connection. Implement a parser to allow the user to pass GSD files as part of the connection setup. | GSD files are used by device manufacturers to help with configuring connections. They outline what data and properties are available. While not strictly required it would allow for the driver to be able to provide a browsing functionality. | High | This file contains all the information to configure a connection and decode the data fields. A parser will be required before a coMedium |
Questions
Below is a list of questions to be addressed as a result of this requirements document:
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