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S7-1200 motion control with absolute encoder

Created by: torefra at: 2/2/2023 6:02 PM (2 Replies)

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2/2/2023 6:02 PM	Rate (0)
torefra Member Joined: 11/15/2012 Last visit: 2/15/2023 Posts: 9 Rating: (0)	Hello everyone, I have to create a small positioning application with the following configuration: 1214 CPUs G120C connected via profinet Absolute encoder connected via Profinet telegram 83 i configured the motion control technology object i think good in fact, in the diagnostic page G1_XIST2 moves when the encoder turns correctly. I noticed however that the encoder always returns 0 on the variable G1_XIST1 however the acutal position value always remains at 0 I don't understand why Is there any other setting to pay attention to? thanks everyone for the help Attachment diag.JPG (125 Downloads)

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2/3/2023 2:21 PM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 6/1/2023 Posts: 5526 Rating: (744)	Hello, there is a description about the configuration: 2.2.2 Automatic transfer of drive and encoder parameters in the device For operation, identical reference values for the drive and encoder connections must be set in the controller and in the drive and encoder. The speed setpoint NSET and the actual speed value NACT are transferred in the PROFIdrive telegram as a percentage of the reference speed. The reference value for the speed must be set identically in the controller and in the drive. The resolution of the actual value in the PROFIdrive telegram must likewise be set identically in the controller and in the drive and encoder modules 2.2.5 Data connection PROFIdrive drive/PROFIdrive encoder The data connection of PROFIdrive drives and PROFIdrive encoders occurs either directly via the PROFIdrive telegram or via a data block. Use the connection via data block if you want to influence or evaluate telegram contents in the user program for process-specific reasons. https://support.industry.siemens.com/cs/ww/en/view/109773400
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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3/8/2023 8:55 PM	Rate (0)
cliff.pennalligen Bronze Member Joined: 7/25/2017 Last visit: 6/2/2023 Posts: 269 Rating: (38)	Hello, I found this in the manual "Motion Control Encoder Absolute encoder with PROFINET". 5.2 Format of actual position values G1_X Signals G1_XIST1 and G1_XIST2 represent the position actual values. For the encoder, the format for both signals is right-justified and fixed. More information on the signals is provided in Chapter: G1_XIST1 (Page 42) and G1_XIST2 (Page 43). As the encoder operates with a Gray code, it permanently transfers the absolute value in G1_XIST - and G1_XIST2 does not supply any additional value regarding the absolute value. If you access the position actual value in telegrams 81 – 84 directly from the user program, read the position actual value from G1_XIST1, and only use G1_XIST2 to read out the error code for an active error. N But I don't know how to get it working in your case. Perhaps the issue is in regard to the check boxes "Automatically apply encoder values at runtime (online)" and "Automatically apply encoder values during configuration (offline)", "

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