EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  <20162017  2018  2019  2020  2021  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  <20162017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: RE: Cost effective solution for monitor a large number of temperatures w EPICS
From: <[email protected]>
To: <[email protected]>, <[email protected]>, <[email protected]>
Date: Wed, 13 Jan 2016 10:06:31 +0000
Hi Mauro,

Your message was pointed out to me because we use Beckhoff modules over EtherCAT for many signals at Diamond. We have experience with a subset of Beckhoff EtherCAT terminals. 

The terminal we use for RTDs is the EL3202-0010 [1] that takes two inputs, but there's a good chance that more dense terminals will be okay with the driver [2] too (e.g. the EL3208 [3]).

The EtherCAT terminals seem to be analogous to the KL3202 and KL3208 [4]. We have no experience with the KL320x series though.

Thanks,

Ronaldo
Diamond


[1] http://www.beckhoff.com/EL3202-0010/ 
[2] https://github.com/dls-controls/ethercat 
[3] http://www.beckhoff.com/EL3208/
[4] http://www.beckhoff.com/KL3208/



> -----Original Message-----
> From: [email protected] [mailto:tech-talk-
> [email protected]] On Behalf Of Jack
> Sent: 13 January 2016 07:26
> To: Ryan Pierce; [email protected]
> Subject: Re: Cost effective solution for monitor a large number of
> temperatures w EPICS
> 
> Ryan,
> 
> I'm looking to find something that works out of the box. The PT100 is a
> requirements.
> Beckhoff has a KL320X, I thought someone has experienced on that...
> 
> I've to balance the cost and the reliability of this solution.
> 
> Thansk,
> -Mauro
> 
> On 1/12/2016 5:16 PM, Ryan Pierce wrote:
> > Does "cost effective solution" apply to parts only or include labor?
> > Are you willing to build your own solution, or are you looking for
> > something that works out of the box? If the former:
> >
> > I've worked with voltage-based analog temperature sensors (TMP36)
> > before. In that case, I designed a Raspberry Pi shield board that
> > included an 8-channel 10-bit ADC addressable via SPI. See
> > http://www.mackenziegems.com/2013/03/14/chillmon-board/ I imagine you
> > could do the same thing with resistance-based PT100's if you set up a
> > voltage divider for each input. The board fabrication and component
> > price was $22 for 8 channels, although you'd need to add in a
> > Raspberry Pi, SD card, power supply, etc. For your application, I
> > might consider dispensing with the Pi altogether, making a shield
> > board for an AVR microcontroller, and have that communicate the
> > channel data with an IOC via USB or TTL serial. I'm amazed at how
> > small, inexpensive, and powerful these AVRs have become, in particular
> > the Teensy: https://www.pjrc.com/teensy/
> >
> > Does it have to be PT100? I strongly prefer digital sensors if
> > possible. I'm currently using DS18B20 OneWire temperature sensors for
> > my brewing project. They are individually addressable and can be
> > strung together in a bus. Resolution is 1/16 degree C if you're
> > willing to wait 750 ms for a conversion; you can configure them to use
> > lower precision which will reduce the conversion time. I don't know
> > how far these 100 sensors are spaced out; you may run into bus length
> > limitations with OneWire, but I've seen documents that talk about
> > improving OneWire performance for long or noisy buses. I'm using an
> > AVR microcontroller to bit bang the OneWire bus, and this is queried
> > via USB serial. OneWire has the ability to detect a broken bus, a
> > non-reporting device, or a transmission error via a CRC. The AVR can
> > check this and raise an EPICS alarm if the output becomes invalid. You
> > could also use one microcontroller to run several independent OneWire
> > buses. This approach is likewise very inexpensive.
> >
> > Ryan
> >
> 
> --
> ________________________________________________________________________
> 
> Mauro Giacchini
> 
> Control Systems Specialist
> INFN Laboratori Nazionali di Legnaro
> Viale Università 2
> I 35020 Legnaro (Padova)
> Tel. +39 049 8068 558
> Fax               558
> 
> EPICS _at_ LNL http://www.lnl.infn.it/~epics/
> 
> ...the first EPICS installation to the project SPES realized from the
> scratch in ITALY is in production since begin 2010!!
> ________________________________________________________________________
> 
> 
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus


-- 
This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail.
Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. 
Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message.
Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom


References:
Cost effective solution for monitor a large number of temperatures w EPICS Jack
Re: Cost effective solution for monitor a large number of temperatures w EPICS Ryan Pierce
Re: Cost effective solution for monitor a large number of temperatures w EPICS Jack

Navigate by Date:
Prev: Re: Cost effective solution for monitor a large number of temperatures w EPICS Jack
Next: RE: Cost effective solution for monitor a large number of temperatures w EPICS austen.rose
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  <20162017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: Re: Cost effective solution for monitor a large number of temperatures w EPICS Jack
Next: Re: Device Support for I2C and GPIO Florian Feldbauer
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  2013  2014  2015  <20162017  2018  2019  2020  2021  2022  2023  2024 
ANJ, 15 Jul 2016 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·