[Dsg-hallc_controls] [EXTERNAL] Re: Controlnet modules

[Steven Lassiter]

Hi Brad,

 This should not be a problem for magnets controls as we are planning on reverting the two Ethernet control modules back to ControlNet modules, most likely on Tuesday.

The Ethernet tags coming from ESR should freeze in the plc. Not a problem.
The Q1 magnet would lose its ability to regulate helium pressure and its valves (it is cold and full of Helium) if it loses communications with the PLC.
Thus the switch back to the standard Controlnet modules.

Thanks
Steven


________________________________
From: Brad Sawatzky <brads at jlab.org>
Sent: Monday, March 8, 2021 2:28 PM
To: Steven Lassiter <lassiter at jlab.org>
Cc: Pablo Campero Rojas <campero at jlab.org>; dsg-hallc controls <dsg-hallc_controls at jlab.org>
Subject: [EXTERNAL] Re: [Dsg-hallc_controls] Controlnet modules

Hi Steven, et al,

The main Hall C router's connection to the rest of the JLab intranet
will be upgraded on Wed.

During the cutover period (which should be quite short if things go
smoothly), there will be a network interruption for devices
communicating between the Hall C subnets and the rest of JLab.

Note that communications within the SHMS hut (for example) should
continue to work since the network switch in the SHMS hut itself will
remain online.  Hiccups are still possible though (ie. DNS may be
briefly inaccessible).

Brent Morris (CNI group) would be the person to talk to if more specific
details are needed.

-- Brad

On Mon, 08 Mar 2021, Steven Lassiter wrote:

> Ok, a few reasons.
> The Ethernet switch is being worked on/replaced? in Hall C on Wednesday.
> With the Ethernet down, will this not prevent the PLC from controlling these
> devices? Magnets on ControlNet are immuned to Ethernet switches, intrusions,
> maintenance and such.
> The Ethernet control modules experienced the same type of  failure as the
> Control net module during experiments. Therefore they are no better then
> controlnet modules for the purpose that they were installed and tested for.
> It is best to keep all control modules of the same type for the ten remote
> chassis in Hall C.
> -Steven
>
> ----------------------------------------------------------------------------
>

> From: Pablo Campero Rojas <campero at jlab.org>
> Sent: Monday, March 8, 2021 1:15 PM
> To: Steven Lassiter <lassiter at jlab.org>; dsg-hallc controls
> <dsg-hallc_controls at jlab.org>
> Subject: Re: Controlnet modules
>
> Hi Steven,
> Two Controlnet modules were swapped by two Ethernet modules for the
> "SHMS-Q1" PLC chassis and  "SHMS-HX" PLC chassis back on June 2018.
> Why do we need to change them back again to the Controlnet modules?
> -Pablo
>
> ----------------------------------------------------------------------------
>

> From: Dsg-hallc_controls <dsg-hallc_controls-bounces at jlab.org> on behalf of
> Steven Lassiter <lassiter at jlab.org>
> Sent: Monday, March 8, 2021 10:10 AM
> To: dsg-hallc controls <dsg-hallc_controls at jlab.org>
> Subject: [Dsg-hallc_controls] Controlnet modules
>
> Hi,
>  I believe the SHMS has two magnets on EthernetControl instead of Controlnet
> modules (one may be just the HX).
> The Ethernet switch in Hall C is being serviced on Wednesday and will be
> down for a time.
> I would like to change the Ethernet modules back to Controlnet modules. This
> will require hardware change as well as unloading and reloading the modules
> in the software.
> Can someone assist me with this today or tomorrow?
> thank you
> Steven

--
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
Ph: 757-269-5947  -<>-  Fax: 757-269-5235  -<>- Pager: brads-page at jlab.org
The most exciting phrase to hear in science, the one that heralds new
  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov
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