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<== Date ==> <== Thread ==>

Subject: Re: Epics Motor Record Encoder Sense
From: "Pearson, Matthew R." <pearsonmr@ornl.gov>
To: "Mexner, Wolfgang (IBPT)" <wolfgang.mexner@kit.edu>
Cc: "tech-talk@aps.anl.gov list" <tech-talk@aps.anl.gov>
Date: Mon, 23 Oct 2017 16:07:03 +0000
Hi Wolfgang,

Setting ERES negative should work, and I do that on some systems. Although where possible I try to avoid it so that the motor and encoder steps move in the same direction on the controller hardware. 

What do the raw count values do? These are available in the RMP and REP fields. ERES is just used to convert REP into engineering units, and put it into RBV (if UEIP=1). So if REP is negative, the negative ERES should result in a positive RBV value.

I’m not familiar with that controller, but some controllers have a way to invert the encoder pulse direction.

Cheers,
Matt



Data Acquisition and Control Engineer
Spallation Neutron Source
Oak Ridge National Lab

> On Oct 23, 2017, at 11:15 AM, Mexner, Wolfgang (IBPT) <wolfgang.mexner@kit.edu> wrote:
> 
> Hallo,
> 
> I am new in epics motor record control and try to configure my first axis with encoder. I am now in trouble with an linear axis with encoder Pro (dex Maxnet Controller). Without encoder. the axis works fine. I activated encoder read out by adding PSE to the init string, UEIP to yes and ERES to 5e-5, then the RBV field changes negative by the correct absolute value, when I move positive with TWF .1. I tried to set ERES negative to -5e-5 without any effect. Has somebody an idea how to change the sense of the encoder readout?
> 
> Thank you very much
>    Wolfgang
> 
> 


References:
Epics Motor Record Encoder Sense Mexner, Wolfgang (IBPT)

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