Transcript Web Enabled EPICS Technologies

EPICS Developments at the Australian Synchrotron
Epics to MySQL
The “Flange” for control system to internet applications
Contributors:
Richard Farnsworth, Andrew C Starritt (Controls Team)
Chris Myers & Mike DeSilva (Versi)
Presented by Nicholas Hobbs
Epics to MySQL
As have most other facilities, we developed an application we called
the Facility Status Monitor (FSM*) .
Originally intended it to be a stand alone application that would be used
throughout the facility and beamlines.
It shows beam current, lifetime, operating status and messages,
shutter status and a few other variables
Proved quite popular
Needed a web version
* Not to be confused with the Flying Spaghetti Monster
Internal Facility Status Monitor
What we did and didn’t want (Requirements)
The FSM should use the “corporate” colour scheme and contain a
summary of all that an Accelerator Physicist, Operator or Beamline
Scientist wants to know at any instant in time
We did not want to distribute a video signal around the facility
We wanted to publish data on the Web, internally and externally
We wanted the ability to build arbitrary web applications in the future
Introducing the “FLANGE”
First we took the original program, “cut the head off” and made it talk
to an SQL database
It was a good first start, but not very general
Introducing the “FLANGE”
First we took the original program, “cut the head off” and made it talk
to an SQL database
It was a good first start, but not very general
Enter the FLANGE. A Flange is a mechanical device for joining two
differing pipes or similar together.
Our FLANGE uses channel access one end and writes EPICS data,
and metadata such as enumeration type, connection state,
update times, element count, data type, alarm severity, precision,
engineering units and high/low operating range to a mySQL
database
Introducing the “FLANGE”
First we took the original program, “cut the head off” and made it talk
to an SQL database
It was a good first start, but not very general
Enter the FLANGE. A Flange is a mechanical device for joining two
differing pipes or similar together.
Our FLANGE uses channel access one end and writes EPICS data,
and metadata such as enumeration type, connection state,
update times, element count, data type, alarm severity, precision,
engineering units and high/low operating range to a mySQL
database
Everything we do with the flange is from a parameter file
It runs natively on windows, but is now in production under WINE
It uses a subset of our GUI framework
The Database
The Flange writes to a MySQL database
It supports arbitrary amounts of historical data – often at lower
resolutions than the EPICs archiver (we use the SNS maintained
archiver) *
It reads from an EPICS gateway (for the usual throttling security and
load reasons)
* http://ics-web.sns.ornl.gov/kasemir/archiver/
The Database
The Flange writes to a MySQL database
It supports arbitrary amounts of historical data – often at lower
resolutions than the EPICs archiver (we use the SNS maintained
archiver) *
It reads from an EPICS gateway (for the usual throttling, security and
load reasons)
We have 1551 PV’s at the moment (We have tested up to 20,000)
Including some very special functions
 Historical backfill for Shutters with data for 8 days
 Historical data for FSM graphs for 1 day
 Specials for images and BMP to Jpegs conversions etc
* http://ics-web.sns.ornl.gov/kasemir/archiver/
AJAX and Php
We then access the MySQL database with AJAX (Asynchronous
JavaScript and XML) to create web applications.
What does it look like?
Web view of the Facility Status Monitor
Other things it can do - 1
We can pass anything through to MySQL – within limits
Have tried 20,000 PV’s, but it takes a hit – so we have slightly
“paralleled” it.
Using a four core machine, we made it possible to run four instances of
the FLANGE writing to a single SQL database and reading from a
single Channel access archive and gateway.
This spreads the load over the four cores and allows time lags to be
introduced, thus spreading the load.
Performance was very good on our web servers.
Other things it can do - 2
Image processing:
It can take an array from EPICS waveform derived from a camera
image and uses it to convert to a JPG to be stored in the SQL
database
This is how we get the beam image.
Other things it can do - 3
EDM to PHP applications
We have a script that converts EDM screens to AJAX applications
using the My-SQL database for data .
It runs in multiple ways: It can run in real-time on the EDM directly, or
can pre-process
This allows many of our Scientists to monitor status from home
Converted EDM GUI from Protein Crystallography Beamline
Converted EDM GUI from the Linear Accelerator
Other things it can do - 4
•http://vbl.synchrotron.org.au/fsm/index.wml
Because we are using AJAX, we don’t have to be limited to ordinary web
pages.
For example we have mobile phone friendly pages (WML)
Database Schema for My SQL database
Web page generated from Scratch
Thank you for your attention
A paper is available with more information.
Australian Synchrotron
www.synchrotron.org.au
www.synchrotron.vic.gov.au
For more information and software:
Richard Farnsworth
[email protected]
Andrew Starritt
[email protected]
ftp://ftp.synchrotron.org.au/pub/EPICS09/