Transcript NETWORKED ATTACHED DEVICES AT SNS

Connecting LabVIEW to EPICS network
Xiang Yan
[email protected]
National Instruments
• EPICS: Experimental Physics and Industrial Control System
•Graphical dataflow programming
•Interactive front panel / GUI
•Efficient compiled execution
•Targets
 Windows, Real-Time, FPGA,
Linux, Macintosh, DSP, Other
Processors
•I/O and analysis libraries
•Distributed networking capabilities
Current LabVIEW-EPICS interfaces
• Shared memory interface
• By SNS ORNL
• DIM (Distributed Information Management
System)
• By GSI CERN
• LabVIEW EPICS Client I/O server
IOC Software with Shared Memory Interface
Network Traffic
(Channel Access Protocol)
Channel Access
Protocol Server
Publishes values from the
database onto the network
using Channel Access
protocol.
Sequencer
(Finite State Machine)
Reads values from the
database to drive state
changes in the IOC
control application.
EPICS Database
Database
Engine
LabVIEW
Application
Shared Memory
Write I/O values to
database. Default update
rate is 10 Hz. Can be as
fast as 25 Hz.
Hardware
EPICS Node – Windows
IOC Software with DIM Interface
•The basic idea is to make LabVIEW application as a DIM
service.
•More like a DIM gateway.
LabVIEW Programming Environment
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•
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Project
Library
I/O server
Shared variable
VI
LabVIEW EPICS Client I/O Server
• Bases on EPICS base 3.14.8
• Runs on LabVIEW for Windows
• Requires LabVIEW Datalogging &
Supervisory Control (DSC) Module
• Integrates with LabVIEW features
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Logging
Alarming
Scaling
...
EPICS and LabVIEW
LabVIEW
Application
OPI
OPI
EPICS
Client
I/O Server
Channel Access Protocol
IOC
IOC
IOC
IOC
EPICS
Database
EPICS
Database
EPICS
Database
EPICS
Database
I/O HW
I/O HW
I/O HW
I/O HW
EPICS and LabVIEW
Network Traffic
(Channel Access Protocol)
Channel Access
Protocol Server
Sequencer
Publishes values from the
database onto the network
using Channel Access
protocol.
Reads values from the
database to drive state
changes in the IOC
control application.
(Finite State Machine)
EPICS Database
Database
Engine
Write I/O values to
database. Default update
rate is 10 Hz. Can be as
fast as 25 Hz.
EPICS Client
I/O Server
LabVIEW Shared Variable Engine
LabVIEW Application
Hardware
EPICS Node
LabVIEW Node – Windows
LabVIEW CA Server (in research)
• Allows you to publish LabVIEW data with CA
protocol
• Supports multiple platforms, hosts and controllers
 Windows
 VxWorks
 …
EPICS and LabVIEW
Monitoring
Archiving
Analysis
etc….
OPI
LV DSC
EPICS Client
Channel Access Protocol
IOC
IOC
IOC
LabVIEW
IOC CAS
EPICS
Database
EPICS
Database
EPICS
Database
EPICS
Database
I/O HW
I/O HW
I/O HW
NI Controller
I/O HW
Thanks for your attentions!
If you are interested in Demo, please
contact me!