Programmable logic controller protocol converter

A programming logic and controller technology, applied in the direction of program control, program control, electrical program control, etc. in sequence/logic controllers, can solve problems such as factory shutdown, easy failure, and a large number of communication cards

Inactive Publication Date: 2010-06-30
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding communication cards to a PLC frequently requires extensive PLC configuration and often requires plant shutdowns, which can be extremely disruptive
Also, some communication cards only provide access to limited data from the PLC device - so depending on what data the plant operator expects to get out of the PLC, this approach could easily fail

Method used

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  • Programmable logic controller protocol converter
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  • Programmable logic controller protocol converter

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Embodiment Construction

[0013] Embodiments of the present invention provide a PLC protocol converter system that allows a SCADA system to efficiently communicate with a PLC device using a desired communication protocol, especially if the PLC device does not "speak" the desired communication protocol. SCADA systems (short for Supervisory Control and Data Acquisition System) centralize processing data and allow remote monitoring and control of various industrial systems. SCADA systems can be configured to collect data in real-time from remote locations to control equipment and conditions in a pipeline (eg, a hydrocarbon pipeline, or a hydrogen pipeline). For example, a SCADA system may be configured to send a request to a PLC controller for a value recorded at an address in memory representing the then current value of a sensor in an industrial plant, or a discrete state of a component in an industrial plant. For a SCADA system to communicate with a PLC, the two must be able to communicate using compat...

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PUM

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Abstract

A programmable logic controller (PLC) protocol converter is disclosed that allows a supervisory control and data acquisition (SCADA) system to effectively communicate with a PLC device using a desired communications protocol, particularly in cases where the PLC device does not ''speak'' the desired communications protocol. A first thread may be configured to continually read PLC addresses, one at a time, using a communications protocol understood by the PLC device. The first thread may store the data values in the shared data array within program memory. Thus, the first thread exposes data from the PLC device, as specified in the configuration file. At the same time, a second thread may be configured to serve the data in the shared data array according to a second communications protocol, e.g., to the SCADA system.

Description

[0001] This application claims priority under 35 U.S.C. §119(e) to Provisional Application No. 60 / 952,118, filed July 26, 2007, which is incorporated herein by reference in its entirety. Background technique [0002] Many industrial facilities employ devices commonly referred to as PLCs (short for Programmable Logic Controllers). PLCs are known to provide microprocessor based industrial control systems. The PLC communicates with other process control components through data links. In process control, PLCs are used for simple switching tasks (such as opening and closing valves), PID control, complex data manipulation, arithmetic operations, timing and processing and machine control, etc. For example, a PLC may be connected to sensors configured to provide temperature, pressure, flow rate, and various other values ​​related to the operating state of an industrial operation. Similarly, a PLC can also collect information related to discrete values, such as whether a given valve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418G05B19/05
CPCG05B19/4185G05B2219/31348G05B2219/14002G05B2219/31436G05B19/058Y02P90/02
Inventor J·卡普曼T·R·卡明斯H·J·拉巴特-托基
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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