Flying Shear with Aux encoder

[jonfarrugia]

I'm working on a flying shear application consisting of two kinetix 350 drives. I need to find a way to connect the encoder connected to the coneyor back into the PLC so that I can use it as the master to sync the flying shear to.

Any ideas? I know the best way would be to use the aux feedback channel on a kinetix 6500 system but because we only had two servos on this machine, the 6500 didnt make sense cost wise. Now i'm scratching my head trying to find a way to connect the encoder to the system.

The PLC is an 1769-L33ERM

 

[widelto]

what about an encoder splitter.

 

[jonfarrugia]

There is no encoder on the conveyor...I need to put one on but the question is, How do I go about getting the encoder connected to the PLC so that I can use the data as a master for the flying shear.
Normally I would connect this encoder to the aux feedback on a servo drive and it would show up as an additional drive, then i'd use it as the master for the other drives. However, I dont have an aux feedback channel with the kinetix 350 drives. Not sure the best way to connect it now.

 

[widelto]

I got it, you encoder on the conveyor has to be a feedback only one, and has to be connected to your HSC module.

 

[jonfarrugia]

ok...I thought of using a high speed counter, but...how do I turn that into a virtual axis so that I can use the signal as a master?

 

[widelto]

John; I designed a flying shear six years ago and It´s still working ok, my design was base on this:
http://samplecode.rockwellautomation.com/intradoc-cgi/nph-idc_cgi.exe?IdcService=GET_SEARCH_RESULTS&urlTemplate=%2fidc%2fgroups%2fpublic%2fdocuments%2fwebassets%2fsc_search_results.hcst&QueryText=%28dSecurityGroup+%3CMATCHES%3E+%27Sample_Code%27%29+%3CAND%3E+%28%28xSC_Products+%3CSUBSTRING%3E+%27Programmable+Controllers%27+%3CAND%3E+xSC_ProductsLevel2+%3CSUBSTRING%3E+%27ControlLogix+System%27%29%29&SortField=dInDate&SortOrder=Desc&ResultCount=25&SearchProviders=mms&&PageNumber=4&StartRow=76&EndRow=100

Go to flying shear sample

 

[MichaelG]

Look at the rockwell knowledge base

https://rockwellautomation.custhelp.com/app/answers/detail/a_id/476493

Ie Add the smallest 350 you can get and use it as feedback only

The PF 755 can also do the same

Note: You want the highest counts per mm(inch) that you can get for the master axis (recommended in other posts)

I have never seen a CIP ethernet Encoder but have wanted one.

Michael