Experimental Physics and
Industrial Control System

[email protected] · Thu, 07 Sep 2006 11:18:45 +0500

I have an idea in mind.I dont know whether it is feasible or not.Since most of the EPICS users are working for an accelerator center and writing the epics device driver for the devices needed to run an accelerator so if we take an initiative to design our own hardware device collaboratively and succeed afterwards it will be a superb thing for us.
I know it is difficult to develop hardware than software but  if you collect the information from all over the world you find every center has developed something indeginious h/w for their machine.
I am trying to make a list of required h/w
magnet power supply
beam position measurement device
beam current measurement device
PLC etc etc
please comment
tanushyam

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TANUSHYAM BHATTACHARJEE
SCIENTIFIC OFFICER
VARIABLE ENERGY CYCLOTRON CENTRE 
1/AF BIDHANNAGAR ,SALTLAKE ,KOLKATA-64
email:[email protected]
Phone #23371230/31/32/33/34 Extn: 2304
Fax: 91 33 3346871
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----- Original Message -----
From: "Dalesio, Leo `Bob`" <[email protected]>
Date: Wednesday, September 6, 2006 3:17 am
Subject: RE: Equipment Availability

> This is really your call - but the way that drivers interface to 
> the database is one of the differences between the TIS4000 and 
> EPICS. Without looking at it, I would say that the protocol is 
> implemented in the driver - so I would take the TIS4000 driver and 
> use the Allen Bradlay Control Logix device support and figure out 
> what calls need to be replaced in the device support to call the 
> correct routines in the driver. Most of the TIS4000 drivers use 
> special addresses for diagnostic information - like communication 
> errors, disconnects, etc... The Control Logix Driver takes into 
> account the possibility that some other PLC master can change the 
> value of an analog output. I don't know if the TIS 4000 drivers 
> took care of this situation. I think their assumption was that the 
> IOC was the only master of the PLC. I don't know if this is a 
> feature that you need.
> Bob 
> 
> -----Original Message-----
> From: David Dudley [[email protected]] 
> Sent: Tuesday, September 05, 2006 2:40 PM
> To: [email protected]
> Subject: RE: Equipment Availability
> 
> I see that TIS-4000 had almost all the drivers I'm looking for.  
> Would it be easier to port one of those drivers to the newer EPICS, 
> or easier to take an existing driver and gut the internals to make 
> it work with the hardware I have?
> 
> David Dudley
> 
> >>> Steven Hartman <[email protected]> 09/05/06 4:12 PM >>>
> On Tue, 5 Sep 2006, David Dudley wrote:
> 
> > I spent 3 or 4 days looking for I/O cards for VME or compactPCI, 
> and 
> > have discovered that there are very few industrial I/O cards 
> offered.> Industrial cards are usually optically isolated, and 
> directly handle 
> > 110VAC on inputs and outputs, and the analogs all handle 4-10ma 
> > current loops without converters.  You can use a simple resistor 
> for 
> > converting an input (technically considered a 'kludge' by most in 
> > industrial working circles), but analog outputs generally take 
> special 
> > adapters to convert from voltage to current.
> 
> I would second Bob Dalesio's recommendation to try and get EPICS 
> working with your existing I/O first. But there are some VME based 
> modules which are better suited for an industrial environment. VMIC 
> has some opto-isolated digital I/O (BI and BO) at 110 VAC, and 
> their 4120 is a 12-bit DAC with 0-20 mA or 4-20 mA outputs. For 
> analog inputs, I have used a resistor across my input and don't 
> consider it too bad of kludge, but there are some ADCs which will 
> take a 4-20 mA input.
> 
> In terms of numbers, most I/O channels in an accelerator controls 
> system are rather slow (most between 1 and 10 Hz here). The high 
> sampling-rate applications just get all of the attention <g>.
> 
> --
> Steve Hartman
> [email protected] || 919-660-2650
> Duke Free Electron Laser Laboratory
> 
> 
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System