7/2/2020 3:25 PM | |
Joined: 9/27/2006 Last visit: 9/22/2024 Posts: 12282 Rating: (2685) |
Hello Philip; The greatest difference between using a CP 342-5 and an integrated Profibus port on a CPUis that the dtat exchange over the bacplane between the CPU and the CP is not synchronized automatically. You must implenent functions DP_SEND and DP_RECV (FC 1 and FC 2) in the PLC program so the CPU can add the Profiobus dtaa in its memory areas. Note that the exchanges over Profibus are handled by the CP 342-5 itself, that requires only a correct configuration in HWConfig. You will find an example of configuring a CP 342-5 as Profibus master and programming FC 1/FC 2 to coordinate the Profibus data from a slave with the PLC memory in the following document (starting at step 2): What should you watch out for when configuring a CP342-5 as DP master and why is it necessary to call the FC1 'DP_SEND' and FC2 'DP_RECV' functions in the user program of the CPU in order to transfer data? https://support.industry.siemens.com/cs/ww/en/view/18208090 Hope this helps, Daniel Chartier |
7/2/2020 4:01 PM | |
Joined: 5/22/2019 Last visit: 7/3/2023 Posts: 12 Rating: (0) |
Hi Duris, Philip AttachmentScreenshot (540).zip (324 Downloads) |
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