2/20/2006 3:45 PM | |
Posts: 102 Rating: (3) |
Dear All Something can be worked out if you can post your project at the site or drom me a mail at shamsher.ppam@yahoo.com along with the type number or mlfb no. of the drive regards shamsher |
2/25/2006 10:58 AM | |
Posts: 10 Rating: (2) |
Dear Sabine You were right ! . As soon as I programmed FC's (DP-SEND , ...) into my project and downloaded it ,everything bacame OK ! Thanks alot |
5/12/2018 2:41 AM | |
Joined: 9/27/2006 Last visit: 9/24/2024 Posts: 12282 Rating: (2685) |
Hello rsp; When using a CP 342-5, you have to handle 2 levels: - one programs exchnges between the CP 342-5 and the CPU: this is where you have to program the DP_Send and DP-Recv blocks, no matter what Profibus slave is selected. What is important is to know the total number of bytes you will transfer. If the largest addresses of the profibus slave is, for example for PPO3 (4 bytes) given as 256..259 by the HWCnfig, then in theDP_Send "SEND" parameter, and in the DP_RECV "RECV" parameter you must input 259. - another level is the telegram you need to send and receive to/from the slave. Since you are using only the Control Word and the Speed reference (PPO3) you have to know what you have to write in these words for the drive to start/stop and run at a selected frequency. So here are 2 links you should look at. The first one is in Spanish, which is a bonus for you, and in slides 19-47 develops a connection between a CP 342-5 and a MM4 drive. The program is in LAD, as you requeted since you are not used to STL; unfortunately it was designed for TIA Portal, but you hould be able to use toi as a basis for your own program. https://es.slideshare.net/johnpir/profibus-dp-55706968 The second link is to a discussion I participated in on the forum a few years ago, describing the Control Word and Speed Reference, giving the basic codes to start and stop the drive. https://support.industry.siemens.com/tf/ww/en/posts/plc-and-drive/21895?page=0&pageSize=10 Hope this helps, Daniel Chartier |
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