Experimental Physics and Industrial Control System
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 ?
>>
>>
>
- References:
- motor: rval/lrvl double or long ? Torsten Bögershausen
- Re: motor: rval/lrvl double or long ? Dirk Zimoch
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