RE: Using MEDM for timing

[Mark Rivers <rivers@cars.uchicago.edu>]

I think you are asking the wrong question.  You don’t need a special medm widget for that, the standard widgets can be used.

 

You do probably need 2 things:

 

1) A feedback record.  The EPICS epid record can be used for this.  It can read the temperature from your readout device and control the power to a power supply using a D/A converter, for example.

 

2) Some other record or client to control the setpoint of the feedback record.  You could use the sscan record in table mode to generate an arbitrary temperature profile, for example. Or you could use a client like Python, IDL, etc.

 

I have attached a screen shot of one of our temperature control screens.  At the time I took this screen shot the thermocouple was broken, so the temperature reading is meaningless, but you get the idea.

 

Mark

 

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of nalaka samarasinghe
Sent: Tuesday, August 20, 2013 9:50 AM
To: tech-talk@aps.anl.gov
Subject: Using MEDM for timing

 

Hi All,

I need to use MEDM application for building a programmable temperature controller. That is the system should be able to heat some fluid at some pre determined temperature for a period and increase the temperature to a higher value and keep it for some period.

I could not find any widget that i can use for this application. It is appreciated if you could give me some guidance on the above.

Thanks & Regards,

Nalaka

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