How Can A PLC Reset The Actual Value Of An Absolute Encoder Of A Servomotor

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Kataeb Associate Join Date: Oct 2013 Posts: 26	How Can A PLC Reset The Actual Value Of An Absolute Encoder Of A Servomotor 10/30/2013 6:04 AM
	We need to reset from the plc the actual value of an absolute encoder of a servomotor. How can we do this? We are using the following hardware. Thank you PLC CPU 313C-2DP COMPACT CPU WITH MPI, 16 DI/16 DO, 3 FAST COUNTERS (30 KHZ), INTEGRATED DP INTERFACE, Siemens 6ES7313-6CG04-0AB0 Control Unit SINAMICS CONTROL UNIT CU320-2 DP WITH PROFIBUS INTERFACE WITHOUT COMPACT FLASH CARD Siemens 6SL3040-1MA00-0AA0 Memory Card SINAMICS S120 COMPACTFLASH CARD WITH FIRMWARE OPTION PERFORMANCE-EXTENSION INCLUDING CERTIFICATE OF LICENCE V4.05 Siemens 6SL3054-0EF01-1BA0 Double motor module SINAMICS S120 DOUBLE MOTOR MODULE INPUT: DC 600V OUTPUT: 3AC 400V, 5A/5A Siemens 6SL3120-2TE15-0AA4 Servomotor SIMOTICS S 1FK7 COMPACT 8 NM, 100 K, 3000 RPM, 2,14KW , ABSOLUTE ENCODER 2048 P/REV (ENCODER A-2048) WITH DRIVE-CLIQ INTERFACE; Siemens 1FK7080-5AF71-1FB2 __________________ ...anything that can go wrong will go wrong...
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JohnDG Guru Join Date: May 2006 Location: Reading, Berkshire, UK. Going under cover. Posts: 9684 Good Answers: 468	#1 Re: how can a plc reset the actual value of an absolute encoder of a servomotor 10/30/2013 6:40 AM
	If it's an absolute encoder, you can't reset it except by disconnecting from the shaft, physically rotating the encoder (disk) and re-connecting. Within the PLC you could add code to apply a positive or negative offset to the encoder value, which would have the same effect. __________________ "Love justice, you who rule the world" - Dante Alighieri
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NotUrOrdinaryJoe Guru Join Date: Apr 2008 Location: Lexington, KY Posts: 1639 Good Answers: 73	#2 Re: how can a plc reset the actual value of an absolute encoder of a servomotor 10/30/2013 8:08 AM
	Check to see if your encoder can be reprogrammed from absolute to relative. Check also your documentation to see if a reset wire is available. __________________ A great troubleshooting tip...."When you eliminate the impossible, whatever remains, however improbable, must be the truth." Sir Arthur Conan Doyle
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#3 Re: How Can A PLC Reset The Actual Value Of An Absolute Encoder Of A Servomotor 10/30/2013 9:57 AM
	Or when you take the data into the PLC from the encoder, put it into a data register (word) and use that value in your logic by multiplying it with another data register set to a value of one. When you want to reset, just load a value of zeo into that second register. __________________ All I every really wanted to be, was... A LUMBERJACK!.
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BIN95 Power-User Join Date: Apr 2005 Location: Las Vegas, NV Posts: 266 Good Answers: 1	#4 Re: How Can A PLC Reset The Actual Value Of An Absolute Encoder Of A Servomotor 10/30/2013 11:38 AM
	Most high speed counter cards (PLC module you wire the encoders to) have a discrete input pin you can activate via PLC to reset high speed counter card to zero. __________________ AB PLC Training onsite, On-Line, training software and more. BIN95.com
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Anonymous Poster #1	#5 Re: How Can A PLC Reset The Actual Value Of An Absolute Encoder Of A Servomotor 11/01/2013 6:03 PM
	Why would you use an 'absolute' encoder when your equipment can read 'quadrature'?
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JohnDG Guru Join Date: May 2006 Location: Reading, Berkshire, UK. Going under cover. Posts: 9684 Good Answers: 468	#6 In reply to #5 Re: How Can A PLC Reset The Actual Value Of An Absolute Encoder Of A Servomotor 11/01/2013 6:29 PM
	Maybe coz the servomotor was supplied with an absolute encoder fitted. __________________ "Love justice, you who rule the world" - Dante Alighieri
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Anonymous Poster (1); BIN95 (1); JohnDG (2); JRaef (1); NotUrOrdinaryJoe (1)

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