CA2393340A1 - Plc executive with integrated web server - Google Patents

Plc executive with integrated web server Download PDF

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Publication number
CA2393340A1
CA2393340A1 CA002393340A CA2393340A CA2393340A1 CA 2393340 A1 CA2393340 A1 CA 2393340A1 CA 002393340 A CA002393340 A CA 002393340A CA 2393340 A CA2393340 A CA 2393340A CA 2393340 A1 CA2393340 A1 CA 2393340A1
Authority
CA
Canada
Prior art keywords
controller
data
scan
executing
network
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002393340A
Other languages
French (fr)
Other versions
CA2393340C (en
Inventor
David T. Lindner
Andrew G. Swales
Merrill W. Harriman
James V. Mc Glaughlin Iii
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric USA Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24751837&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2393340(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2393340A1 publication Critical patent/CA2393340A1/en
Application granted granted Critical
Publication of CA2393340C publication Critical patent/CA2393340C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0421—Multiprocessor system
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/052—Linking several PLC's
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/12—Plc mp multi processor system
    • G05B2219/1214—Real-time communication between plc, Ethernet for configuration, monitor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/12—Plc mp multi processor system
    • G05B2219/1216—Interlock problem, avoid sending data to slave when slave processes data
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/15—Plc structure of the system
    • G05B2219/15081—Period length ratio between application and communication task is settable
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/23—Pc programming
    • G05B2219/23217—Parallel processing
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/31—From computer integrated manufacturing till monitoring
    • G05B2219/31186—TCP-IP internet protocol
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/34—Director, elements to supervisory
    • G05B2219/34038—Web, http, ftp, internet, intranet server

Abstract

A programmable logic controller for use as part of an industrial control system or as part of an automated system and a corresonding method, the controller including an interface to the Internet, and including a web serve r allowing a remote computer to access web pages maintained by the controller providing information relevant to the control function of the controller suc h as control sensor readings and, optionally, information about the status of the control system. The web server is implemented as part of the controller in such a way that the controller scan rate (the rate at which the ladder logic for all associated control system devices is repeated) is unaffected by execution of the web server.

Claims (18)

1. A controller for use as part of an industrial control system or as part of an automated system, the controller for controlling at least one input/output device, the controller capable of interacting with a remotely located computer via a network, such as the Internet, the controller comprising:
a) means for executing a controller scan including solving ladder logic associated with the at least one controlled input/output device, the controller scan having a predetermined scan rate;
b) a web server for gathering data relevant to a control function, the web server being responsive to a request for the data from the remotely located computer; and c) web pages comprising data and associated instructions retrievable and executable by the remotely located computer, the instructions causing the remotely located computer to present the data for display in a predetermined format;
wherein in response to a request for data, the web server provides one or more web pages in which the requested data are displayed.
2. The controller of claim 1 wherein the means for gathering data executes as a background task.
3. The controller of claim 1 wherein the means for gathering data executes in parallel with the means for executing the controller scan.
4. The controller of claim 1 wherein in response to a request for data from the remote computer, the means for gathering data provides no more than a predetermined maximum number of bytes of combined data and instructions per scan by the means for executing the controller scan.
5. The controller of claim 4, wherein the maximum number of bytes per scan is predetermined to be a number of bytes that can be communicated to the network for delivery to the remote computer in less than the time required for one scan by the means for executing the controller scan.
6. The controller of claim 1 wherein at least some of the data are resident on a different controller, the data-gathering means being configured to access and obtain the data from the different controller via a computer network.
7. The controller of claim 1 wherein the controller further comprises a transmission control program (TCP)/ Internet protocol (IP) stack customized to communicate any MODBUS command or message as a single TCP/IP packet.
8. The controller of claim 7 wherein the web server comprises a file server for providing the web pages.
9. The controller of claim 8 wherein the web server further comprises a hypertext transfer protocol (HTTP) server providing file get functionality.
10. The controller of claim 9 wherein the web server further comprises a file transfer protocol (FTP) server for receiving new or replacement web pages over the network via the TCP/IP stack and provides them to the file server.
11. The controller of claim 7 wherein the means for executing the controller scan is coupled to a MODBUS handler, which in turn is interfaced to the TCP/IP
stack, thereby coupling the means for executing a controller scan to the network.
12. The controller of claim 7 wherein the means for executing the controller scan is coupled to a local network input/output interface thereby coupling the means for executing the controller scan to a local network.
13. A method of controlling at least one input/output device of an industrial control system or automated system and of interacting with a remotely located computer via a network, such as the Internet, the method comprising the steps of:

a) executing a controller scan including solving ladder logic associated with the at least one controlled input/output device, the controller scan having a predetermined scan rate;
b) gathering data relevant to a control function;
c) storing web pages comprising data and associated instructions retrievable and executable by the remotely located computer, the instructions causing the remotely located computer to present the data for display in a predetermined format; and d) responding to a request for the data from the remotely located computer by providing one or more of the web pages used to display the requested data.
14. The method of claim 13 wherein the step of gathering data and the step of responding to a request for the data are executed as background tasks.
15. The method of claim 13 wherein the step of gathering data and the step of responding to a request for the data execute in parallel with the step of executing the controller scan.
16. The method of claim 13 wherein in responding to a request for data from the remote computer, no more than a predetermined maximum number of bytes of combined data and instructions per scan are provided.
17. The method of claim 16, wherein the maximum number of bytes per scan is predetermined to be a number of bytes that can be communicated to the network for delivery to the remote computer in less than the time required for one scan.
18. The method of claim 13, further comprising the step of communicating over the network MODBUS commands or messages, wherein any MODBUS command or message is communicated over the network as a single TCP/IP packet.
CA2393340A 2000-10-10 2001-10-08 Plc executive with integrated web server Expired - Lifetime CA2393340C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/685,355 2000-10-10
US09/685,355 US6640140B1 (en) 2000-10-10 2000-10-10 PLC executive with integrated web server
PCT/US2001/031367 WO2002031608A2 (en) 2000-10-10 2001-10-08 Plc executive with integrated web server

Publications (2)

Publication Number Publication Date
CA2393340A1 true CA2393340A1 (en) 2002-04-18
CA2393340C CA2393340C (en) 2010-09-14

Family

ID=24751837

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2393340A Expired - Lifetime CA2393340C (en) 2000-10-10 2001-10-08 Plc executive with integrated web server

Country Status (8)

Country Link
US (1) US6640140B1 (en)
EP (1) EP1354249B1 (en)
JP (3) JP2004511845A (en)
AT (1) ATE316260T1 (en)
CA (1) CA2393340C (en)
DE (1) DE60116788T2 (en)
MX (1) MXPA02005583A (en)
WO (1) WO2002031608A2 (en)

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Also Published As

Publication number Publication date
JP5219954B2 (en) 2013-06-26
JP2013050978A (en) 2013-03-14
WO2002031608A2 (en) 2002-04-18
MXPA02005583A (en) 2002-09-18
CA2393340C (en) 2010-09-14
ATE316260T1 (en) 2006-02-15
JP2009271933A (en) 2009-11-19
WO2002031608A3 (en) 2003-07-24
EP1354249B1 (en) 2006-01-18
EP1354249A2 (en) 2003-10-22
DE60116788T2 (en) 2006-08-24
DE60116788D1 (en) 2006-04-06
US6640140B1 (en) 2003-10-28
JP2004511845A (en) 2004-04-15

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