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S7 tech with sinamics s120 not reading actual velocity

Created by: DUTTA at: 10/26/2011 4:43 AM (2 Replies)

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10/26/2011 4:43 AM	Rate (0)
DUTTA Posts: 102 Rating: (1)	Experts, I am using s7 technology CPU s7 315T with several sinamics s120 drive. Everything working fine but somehow I am not getting actual velocity in any speed axis db. Now I have created this axis as a speed axis and the drives are confIgured as speed control without any encoder feedback. When I see the system variable actor data.actual velocity in s7 tech configuration imcan see the value. But in axis db I don't see it. Please let me know to read actual velocity from system variable or what is needed to get the actual speed? Regards, Dutta
DUTTA Posts: 102 Rating: (1)
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10/26/2011 4:55 PM	Rate (0)
miami Platinum Expert Joined: 8/31/2005 Last visit: 8/20/2024 Posts: 2198 Rating: (328)	Hello, if you use speed axis without encoder, the ActualVelocity in the T-DB will always be 0 (See chapter 7.1 in the documentation.or attachment) The SIMOTION variableactordata.actualvelocity can not be used inside the T-CPU. You can get a (low-speed) information on the actual speed by reading the drive parameter r21 or r22 with MC_ReadDriveParameter . Attachment page from s7_technology_en-US.pdf (134 Downloads)

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10/27/2011 4:54 PM	Rate (0)
DUTTA Posts: 102 Rating: (1)	Hi Miami, It is working now with theses blocks. Really appreciate you help. Regard Dutta
DUTTA Posts: 102 Rating: (1)
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