It depends on whether using floating point could introduce precision
errors in the long term, something that might happen with stepper
motors without encoders, for example.
2016-06-07 9:07 GMT-03:00 Dirk Zimoch <[email protected]>:
> It would also allow more than 32 bit signed. With modern motors and encoders
> this is not sufficient any more.
>
> However it may necessary to modify the existing low-level motor drivers.
>
> Dirk
>
>
> On 07.06.2016 12:10, Torsten Bögershausen wrote:
>>
>> The rval and lrvl fields are declared as DBF_LONG in motorRecord.dbd.
>>
>> In opposite to what is explained in documentation/motorRecord.html,
>> they are double here.
>>
>> Does it make sense to turn them into double ?
>> This would ease the usage of servo motors and/or controllers
>> that talk engineering units on the line.
>>
>>
>> And at the same time, add the "set point dead band" ?
>>
>> http://www.aps.anl.gov/epics/tech-talk/2015/msg01485.php
>>
>> http://www.aps.anl.gov/epics/tech-talk/2013/msg01051.php
>>
>> What are the pros and cons for long vs double ?
>>
>>
>
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- motor: rval/lrvl double or long ? Torsten Bögershausen
- Re: motor: rval/lrvl double or long ? Dirk Zimoch
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