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4
An Implementation of High Availability in
Networked Robotic Systems
Florin Daniel Anton, Theodor Borangiu and Silvia Anton
University Politehnica of Bucharest
Romania
1. Introduction
Nowadays production flows are modular, each module in the enterprise being specialized and
used to achieve a particular task. In many cases the modules are interconnected and materials
are sequentially processed in each module resulting a final, unique product or assembly. One
typical such production module is a flexible cell/system using multiple robots. In such
complex enterprise environments, providing continuous services for applications is a key
component of a successful implementing of robotized manufacturing. High availability (HA) is
one of the components contributing to continuous service provision for applications, by
masking or eliminating both planned and unplanned downtime of systems and applications.
This is achieved by eliminating hardware and software single points of failure (SPOF).
The systems configured for high availability are a combination of hardware and software
components configured to work together to ensure automated recovery in case of failure
with a minimal acceptable downtime.
A high availability solution will ensure that the failure of any component of the solution -
either hardware, software or system management, will not cause the application and its data
to become permanently unavailable. High availability solutions should eliminate single
points of failure through appropriate design, planning, hardware selection, software
configuring, application control, carefully environment control and change management
discipline.
In short, one can define high availability as the process of ensuring an application is available
for use by duplicating and/or sharing hardware resources managed by a specialized software
component. A high availability solution in robotized manufacturing provides automated
failure detection, diagnosis, application recovery, and node (robot controller) re integration.
The chapter discusses the implementing of a high availability solution in a robotized
manufacturing structure (cell, line). The solution is based on a High Availability Linux
Cluster which is responsible for data availability and preservation on a NFS (Network File
System) file system, and a second cluster – Fabrication Cluster (FC) which runs on Adept
robot controllers, developed under the V+ programming language.
2. High availability versus fault tolerance
Based on the response time and response action to system detected failures, clusters and
systems can be generally classified as:
Open Access Database www.i-techonline.com
Source: Advances in Robotics, Automation and Control, Book edited by: Jesús Arámburo and Antonio Ramírez Treviño,
ISBN 78-953-7619-16-9, pp. 472, October 2008, I-Tech, Vienna, Austria
www.intechopen.com
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Inhaltsverzeichnis

Seite 1 - Networked Robotic Systems

4 An Implementation of High Availability in Networked Robotic Systems Florin Daniel Anton, Theodor Borangiu and Silvia Anton University Politehnica o

Seite 2

Advances in Robotics, Automation and Control 54 • displaying the vision system status; training models; • configuring switches and parameters for

Seite 3

An Implementation of High Availability in Networked Robotic Systems 55 The advantage of the Vision window is that all commands can be issued using me

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Advances in Robotics, Automation and Control 56 1. A user class where the operator can observe images acquired from observation web cameras and i

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An Implementation of High Availability in Networked Robotic Systems 57 • A set of dynamic data values called dynamic attributes, reflecting the curr

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Advances in Robotics, Automation and Control 58 Attribute A resource class and a resource have several attributes. An attribute has a value and a u

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An Implementation of High Availability in Networked Robotic Systems 59 The only exception is the Sensor resource manager. It is the only resource man

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Advances in Robotics, Automation and Control 60 Condition A condition applies to a resource class. It may contain a selection string, which is used

Seite 9 - Lotus Domino

An Implementation of High Availability in Networked Robotic Systems 61 A condition may also contain a node group list that the event is monitored on.

Seite 10 - (web browser)

Advances in Robotics, Automation and Control 62 condition and a response is considered a separate association. Once associated, the condition and r

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An Implementation of High Availability in Networked Robotic Systems 63 4.4.4 File system resource manager The File system resource manager manages on

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Advances in Robotics, Automation and Control 46 • Fault-tolerant • High availability 2.1 Fault-tolerant systems The systems provided with fault t

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Advances in Robotics, Automation and Control 64 Fig. 13. Implementing the high availability solution for the networked robotic system. There are t

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An Implementation of High Availability in Networked Robotic Systems 65 In this mode the Fabrication Cluster is not aware about the problems from the

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Advances in Robotics, Automation and Control 66 take the functions of another robot in case of failure. If this involves common workspaces, program

Seite 16

An Implementation of High Availability in Networked Robotic Systems 67 removed the robot from the cluster and reconfigured the cell (see Fig. 15). Th

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Advances in Robotics, Automation and Control 68 and the cluster reconfiguration took 2.5 seconds. When configuring the cluster in order to test in

Seite 18

Advances in Robotics, Automation and ControlEdited by Jesus Aramburo and Antonio Ramirez TrevinoISBN 978-953-7619-16-9Hard cover, 472 pagesPublisher I

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An Implementation of High Availability in Networked Robotic Systems 47 • Peer domain • Managed domain The general difference between these types of

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Advances in Robotics, Automation and Control 48 as a single entity that can be moved from node to node in the event of a component or node failure.

Seite 21 - 6. Conclusion

An Implementation of High Availability in Networked Robotic Systems 49 The design of RMC architecture is presented for a multiple-resource production

Seite 22

Advances in Robotics, Automation and Control 50 Each resource manager is instantiated as one process. To avoid the multiplication of processes, a r

Seite 23 - NETWORK BROADCAST

An Implementation of High Availability in Networked Robotic Systems 51 Most RMC commands provide the user with a similar perception. Many commands ha

Seite 24 - 7. References

Advances in Robotics, Automation and Control 52 Fig. 6. The structure of the system which provides the web based interface. The eClients Applicati

Seite 25

An Implementation of High Availability in Networked Robotic Systems 53 Fig. 7. The VNC Communication. Lotus-oriented solutions have been considered

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