5/2/2008 6:20 PM | |
Posts: 33 Rating: (6) |
The status word will always be available via the Profibus network. It is just the Profibus control commands that are affected buy the parameter selection. |
12/24/2008 7:28 AM | |
Joined: 9/27/2006 Last visit: 9/22/2024 Posts: 12282 Rating: (2685) |
Wrong. Hasrol, sorry. The PZD area is used to access process data from the drive, cyclically, continuously. Process dataOUT (from the DP-master to the drive) includes the control word (a bit pattern that controls Start, Stop, Jog, rotation....) and the Speed reference command to the drive. Process data IN includes the status word (bit pattern of the commands being executed on the drive) and the Speed Feedback word (the present speed of rotation as seen by the drive). The PKW (parameter values) area is a once-in-a-while, acyclical telegram you use to read/write parameter values on the drive, such as the ramp-up and ramp-down times, teh maximum speeds, etc... To do what you plan, you need to configure communications withthe PZD area in your Step 7 project, and read the input words (PIWxxx addresses) given by the Profibus configuration). In the following link you can find some programming examples for the MM440 with a Profibus-DP interface (in Step 7): http://support.automation.siemens.com/WW/view/en/22813212 Open and study the different programs so you can understand what you need to do for yours. You will also find as attachment a parameter guide for initial commissioning of a MM440 drive. i hope it will reply adequately to the second request. Hope this helps, Daniel Chartier AttachmentMM4 Step by step guide to commissioning.pdf (1400 Downloads) |
Last edited by: dchartier at: 12/24/2008 7:34 AM |
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