[Dsg-hallc_controls] Hall C PLC task #4- Add HMS "spectrometer vacuum" controls

[Tyler Lemon]

Hi Steven, 

Thank you for your reply. 

It seems the starting point for the HMS vacuum control would be to look at the SHMS code. Could you send us the SHMS code? We do not have that yet. 

Could you also send us the code that is currently on the standalone test PLC? You mentioned that that code was for a preliminary remote alarm notification system. Since remote alarms are also on DSG's task list, having that code would at least give us a general starting point and an idea of what has been tried already. 

Best regards, 
Tyler 


From: "Steve Lassiter" <lassiter at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "Mike Fowler" <fowler at jlab.org> 
Sent: Tuesday, May 29, 2018 10:48:59 AM 
Subject: Re: [Dsg-hallc_controls] Hall C PLC task #4- Add HMS "spectrometer vacuum" controls 

Hi Tyler, 

The HMS Spectrometer vacuum signal will be a 0-10V (or 4-20mA signal) coming from a standalone vacuum gauge within the hall. The signal will first go to a dataforth signal conditioner and then to a PLC IF16 I/O module. The gauge will be an Edwards wide range unit that can do both high and low vacuum ranges. 

Which PLC I/O module it will go to depends on which chassis has an available input channel. The Dipole Chassis is used for cryo and extra sensor inputs, but it may be fully populated. The three quads have empty IF16 channels in their slot 7 I/O module. 

Layout of both hardware and wiring will be needed for the techs to install. 

Programing of the vacuum sensor can start by copying one of the SHMS's vacuum gauge routine. This routine covers errors and fault conditions that the unit can self report on. 

There will be only one gauge for the HMS spectrometer vacuum, as it is common to all the HMS magnets. 

This task can be combine with the HMS shutter status, which is also a new I/O input for the HMS and is a standalone type of input, not used by any of the magnets but needs to use one of the I/O chassis to get into the PLC. This status signal will be a two state indicator, open or close, which would require only one I/O channel. 

Steven 





From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-hallc controls" <dsg-hallc_controls at jlab.org> 
Sent: Tuesday, May 29, 2018 8:23:41 AM 
Subject: [Dsg-hallc_controls] Hall C PLC task #4- Add HMS "spectrometer vacuum" controls 

Hello Steven and Mike, 

As Pablo mentioned in his task list from last Friday, I will start working on task #4 to add HMS "spectrometer vacuum" controls to the PLC. 

I've started looking over the HMS PLC program and I have a few questions on the task: 

1.) What is the main goal of this task? What vacuum controls need to be added? 

2.) What instrumentation will be used for this task? Could you send manuals for all instrumentation that will be used? 

Best regards, 
Tyler 


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