Integrating LabVIEW into a Distributed Computing Environment for EPICS

Title: Integrating LabVIEW into a Distributed Computing Environment for EPICS

Abstract: This research aimed to integrate National Instruments LabVIEW into a distributed computing environment based on the Experimental Physics and Industrial Control System (EPICS). The integration was achieved using ActiveX interfaces, allowing LabVIEW to communicate with EPICS servers and clients. The paper discusses the design decisions, provides performance information, and addresses the requirements for the Spallation Neutron Source (SNS) diagnostics system.

Main Research Question: How can LabVIEW be integrated into a distributed computing environment for EPICS, maintaining performance and flexibility?

Methodology: The researchers used ActiveX interfaces to connect LabVIEW to EPICS servers and clients. They developed two ActiveX Automation Server programs: 'EpicsCA-Server.ProcessVariable' and 'EpicsCAClient.ProcessVariable'. These programs interfaced with the CA server and client libraries, respectively. LabVIEW was used to create "Create" and "Set" VIs that took the name of the new process variable and modified the value in response to user interface changes.

Results: The integration of LabVIEW into the EPICS environment was successful. LabVIEW could serve read-only process variables and modify values in response to user interface changes. The researchers found that LabVIEW polled for input from CA and modified the value of the knob in response.

Implications: The integration of LabVIEW into the EPICS environment allows casual programmers to use a visual environment on a single PC for developing their logic. This integration maintains performance and flexibility, making it suitable for large projects. The ActiveX interfaces provided by the researchers allow LabVIEW to communicate with EPICS servers and clients, making it easier for application engineers to implement their tasks.

Significance: The integration of LabVIEW into the EPICS environment is a significant development for the field. It allows casual programmers to use a visual environment for developing their logic, making the process more accessible and efficient. The ActiveX interfaces provide a seamless connection between LabVIEW and EPICS, ensuring that performance and flexibility are maintained. This integration is particularly useful for large projects, such as the Spallation Neutron Source (SNS) diagnostics system.

Link to Article: https://arxiv.org/abs/0111001v1 Authors: arXiv ID: 0111001v1