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Absolute Encoder connection

Created by: Kiren at: 4/2/2010 7:58 PM (4 Replies)

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4/2/2010 7:58 PM	Rate (0)
Kiren Posts: 33 Rating: (0)	Hello, Can we connect Absolute encoder with Hard wiring OR should it be connected via profibus only. Thanks
Kiren Posts: 33 Rating: (0)
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4/2/2010 10:25 PM	Rate (1)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 10/4/2024 Posts: 4515 Rating: (839)	Hello, Siemens offers function modules for absolute encoder applications. So, you can connect your absolute encoder to one of these modules and you can use profibus type of absolute encoder as well. Here's bellow some of these modules: ET200S type: 6ES7138-4DB03-0AB0 SIMATIC DP, ELECTRONIC MODULE F. ET 200S, 1 SSI 25BIT/1MHZ 15MM WIDE MODULE FOR CONN. OF ABSOLUTE ENCODERS WITH SSI INTERFACE SYNCHRONOUS SERIAL INTERFACE WITH DI AND COMPAR. VALUE WITH CLOCK CYCLIC SYNCHRON. APP ET200M type: 6ES7338-4BC01-0AB0 SIMATIC S7-300, SIGNAL. MODULE FOR 3 SSI SENSORS FOR READ-IN OF POSITIONING VALUE WITH 2 FREEZE INPUTS , 1 X 20 PIN, SUPPORTS ISOCHRONE MODE Regards,
	Ayman Elotaify
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4/3/2010 9:28 AM	Rate (0)
Kiren Posts: 33 Rating: (0)	Hello, Thanks for yor answer. It is helpful. My question is can absolute encoder have connections lke A+, A-, B+,B- , Z+,Z-, 24 V and 0 V OR should it be having 4 wire connections (A, B, 24 V, 0 V ) only.
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4/3/2010 10:58 AM	Rate (1)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 10/4/2024 Posts: 4515 Rating: (839)	kiran dave Hello, Thanks for yor answer. It is helpful. My question is can absolute encoder have connections lke A+, A-, B+,B- , Z+,Z-, 24 V and 0 V OR should it be having 4 wire connections (A, B, 24 V, 0 V ) only. Dear kiran dave, The absolute encoders and incremental encoders have a different connections. Incremental encoders, have supply voltage, A & B channel signal and Z signal in some cases for zero signal. Some encoders have also A- & B- signals if reverse direction have to be detected. But in absolute encoder, you have SSI data signal andSSI clock signals. In any case, FM351 is a posinioning module and it can be connected to absolute encoder/ incremental encoder. Please find the attached table that containing compas=rison between them Regards, Attachment fm351_operating_instructions_en[1].pdf (840 Downloads)
	Ayman Elotaify
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4/3/2010 3:42 PM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 10/5/2024 Posts: 3024 Rating: (1054)	kiran dave Can we connect Absolute encoder with Hard wiring OR should it be connected via profibus only. Hello kiran dave Connecting absolute Encoders hardwired is a thing of the past as far as I'm concerned (depending on the resolution you require a fair few wiring cores as well as digital inputs). A Profibus DP based connection is the way to go for absolute Encoders and also allowes you to (flexibly) preset the Enocder with a reference value if need be. Anyway, below is an "oldi but goldie" conciseEncoder handbook (courtesy of Dahaner) which will hopefully help in clarfying the general differences between incremental and absolute Encoders as well as the variouspossibilities on how to link them toa PLC: Danaher Encoder Handbook I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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