EP1664947A2 - Prozessrechner-schnittstelle auf der basis einer beschreibungs- oder auszeichnungssprache, insbesondere xml - Google Patents
Prozessrechner-schnittstelle auf der basis einer beschreibungs- oder auszeichnungssprache, insbesondere xmlInfo
- Publication number
- EP1664947A2 EP1664947A2 EP04766806A EP04766806A EP1664947A2 EP 1664947 A2 EP1664947 A2 EP 1664947A2 EP 04766806 A EP04766806 A EP 04766806A EP 04766806 A EP04766806 A EP 04766806A EP 1664947 A2 EP1664947 A2 EP 1664947A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- xml
- mode
- drive
- computer
- interface according
- 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.)
- Withdrawn
Links
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
- G05B19/0423—Input/output
Definitions
- the invention relates to a universally usable interface for process computers, which can be, for example, regulators or controls for electric drives.
- the interface is used for the information technology or communication coupling of the process computers, drive controllers or the like to other computer nodes, which can be, for example, operator terminals, control center and / or diagnostic computers, other process computer nodes or hierarchically higher-level controls.
- the specialist article "Info portal for cross-plant process visualization and management via the Internet” (authors: Andreas Kitzler and Werner Feiten) is known from a summary of the conference proceedings on the "SPS IPC-Drives" congress held in Nuremberg in November 2001.
- a communication structure is proposed therein in which a plurality of mutually independent automation systems, cells or systems can be combined, monitored, visualized and the like via an information portal.
- the information portal can be accessed via the Internet.
- the communication between the automation cells (so-called Supervisory Control And Data Acquisition - SCADA) on the one hand and the central web server of the information portal on the other hand takes place via standard interfaces based on the expandable markup language XML.
- every automation system is provided with a so-called XML agent for communication with the information portal based on TCP-IP.
- Management should be able to evaluate various automation cells or SCADA systems in a qualified manner via the web.
- the individual sensor data can be transported via the web from the information portal, it must first be collected at the level that is specific to them, processed there and made available to the information portal via the XML agents.
- a computer network with diagnostic computer nodes is known from the older international patent application PCT / EP2003 / 050 349 (WO2004 / 014 022), which communicates with process computer nodes, in particular drive controllers, via XML-based communication interfaces (there called "communication computer nodes" or "communication module”).
- the communication computer node is with a software module with the function of an information broker for parameters described, the task of which is to provide an XML-based parameter interface for access to the parameters of the process computer node.
- An XML-based protocol defined with the help of an XML schema is used as the protocol, which communicates with a client of the computer network via TCP / IP. The functions of reading and writing parameters from or to the process computer node are implemented.
- the present invention is based on this earlier registered invention and represents a further, possibly generalized embodiment of the process computer interface described in the earlier application as a communication computer node.
- the disclosure of the older application does not contain the teaching of “operating” the process computer as it were via universal controls of its process control functions.
- no mechanisms are shown which could ensure sufficient transparency and security in the transmission of the XML protocols.
- the invention has for its object to provide a universal process computer, in particular drive interface, which can be adapted for different process and process computer technologies, or the process computer interface should be independent of the technology and hardware currently used in the process computer and in the Date ⁇ transmission technology.
- markup languages in particular the XML (eXtensible Markup Language) based on SGML (Standardized Generalized Markup Language)
- XML eXtensible Markup Language
- SGML Standardized Generalized Markup Language
- a generally valid interface is formed, with which in theory any process computer and thus the one controlled by it can be controlled technical-physical process, in particular electrical drive processes can be controlled and operated.
- the functional interface according to the invention entire processes can be triggered in the process to be controlled, including data processing processes in the process computer, by interpreting information prepared with the markup language or, for example, XML protocols upon receipt in the interface.
- a controller assigned to an axis can be synchronized with another drive by means of an XML document.
- the source information for this is in the order received as an XML description from the interface.
- the interface according to the invention does not necessarily have to be integrated in the process computer. It can also run as an external software module on any hardware that has a communication link to the process computer.
- FIG. 1 shows a block-like representation of the internal basic structure of the interface according to the invention
- FIG. 2 uses a time diagram to select an operating state and then activate and deactivate it
- FIG. 3 shows the time sequence of the communication sequence in the “speed mode” operating state when accelerating and braking an electric drive
- FIG. 4 shows the temporal communication sequence when the position of the electric drive changes in the “position mode” operating state
- FIG. 5 shows the temporal communication sequence in the case of a cyclical subscription for diagnostic purposes
- FIG. 7 shows a block diagram with a signal flow for a controller sign-of-life monitoring by means of the interface according to the invention
- Figure 8 is a schematic Ethemet network structure, in which the interface according to the invention can be used and
- FIG. 9 shows a further internal software structure of the interface according to the invention designed as a communication PC and XML server.
- the functionalities of the interface according to the invention intended for electric drives can be divided into the three sub-modules or sub-areas "operation", “diagnosis” and “configuration”.
- the drive can be made up of one Drive controller or a drive control, a power section connected downstream of this, for example with a power amplifier and current or converter, and an electric motor.
- the aim of the "Operation" area or submodule is to control the drive functions.
- the XML documents in this area provide all drive-specific functions that are required for operating the drive in this application.
- An associated software module contains state machines that reflect the current state of the drive and influence the state of the drive through the specified XML requests.
- a communication connection for example a TCP / IP socket connection, is established for the communication of a client computer node with the interface submodule "Operation" as a server, via which XML documents can be transmitted.
- the interface submodule on the client and / or, for example, on a drive controller triggers a communication error that leads to a defined shutdown response if the drive is in an inactive operating state, disconnecting the connection does not trigger an error reaction.
- the operating status of the drive can basically be divided into four different categories: production, set-up, service and initialization. There are different operating states in each category, which can be preselected according to Fig. 2 by an XML request and possibly configured. The selected operating state can be activated or deactivated with the help of a subsequent start / stop order.
- the operating state is to be preselected.
- the XML order "order" is transmitted to the interface submodule and its successful processing is confirmed by the response "OK”.
- the operating state is preselected. It can then be activated with the activation message "SW_Start”. Successful processing is confirmed with "OK”. Similarly, the operating state can be deactivated with "SW_STOP".
- the drive In the "Speed_Mode" operating state, the drive is in a speed control and accelerates to a predetermined speed.
- the XML request "Speed_Mode” is accepted by the operator submodule or function manager, provided that there is no error state and the previous state has been deactivated. If the drive is already in the "Speed_Mode” state and is activated, the following “Speed_Mode” can be used “Jobs the rotational speed of the drive are changed. The" Speed_Mode "jobs are processed sequentially. Fig. 3 shows an example of acceleration and braking in "Speed_Mode".
- the XML command "Position_Mode” is accepted by the interface submodule "Operation” if there is no error condition and the previous status has been deactivated. If the drive is already in the "Position_Mode” state and is activated, the position of the drive can be changed with subsequent "Position_Mode” jobs.
- the Position_Mode orders are processed sequentially. 4 shows an example of changing the position in the "Position_Mode".
- a pre-selected operating state can be activated with the activation command 1 , SW_Start ".
- Activation command SW_Start ":
- An activated operating state can be deactivated with the deactivation command "SW_Stop". If the drive is not in the activated state, an error message is generated.
- - ⁇ Mode> "controller_orf_at_standstiH”: The controller is braked to a standstill with the braking ramp ⁇ Acceleration_max> and then switched off.
- ⁇ Mode> "controller_on”: The controller is braked to a standstill with the braking ramp ⁇ Acceleration_max> and remains switched on.
- the aim of the "Diagnostics" area or sub-module is to provide information on drive diagnostics.
- the client e.g. control center process
- the client can subscribe to a grouping of any information from the information provided by the drive. These are then transferred to the control center process in a configurable time interval or when changes are made.
- a separate communication connection to the "Diagnostics" interface module is established for each subscription.
- the maximum number of simultaneous subscriptions to the "Diagnostics" interface module is limited.
- the following example table shows examples of the information supplied by the "Diagnostics" interface module.
- the "Diagnostics" interface submodule can send the diagnostic information in two different ways: cyclical subscription and event-based subscription.
- FIG. 5 shows the communication flow for a cyclical subscription. After the Connection, the subscription is requested by a "Subscription Request” message. After the order has been successfully processed, a data message “Data” is sent immediately. The data is then sent in a predetermined time frame. A “Subscription Cancel” message ends the subscription and the communication connection.
- Event based subscription In the "Event-based subscription" mode, the subscribed information is only transmitted when there is a change, but not more than a configurable period of time. To ensure that slight fluctuations in numerical values do not result in constant message transmission, the data is only sent if it exceeds more than an internal tolerance threshold from 6 shows the communication sequence for an event-based subscription.
- the subscription After the connection has been successfully established, the subscription is requested by a “Subscription_Request_Event” message. After the order has been successfully processed, a data message "Data" is sent immediately. After that, the data is only sent when one or more of the subscribed parameters are changed - but at a maximum with the frequency specified in ⁇ Refresh_Time>.
- a change indicator (change_flag) is transmitted for the event-based subscription, which indicates whether a parameter has changed compared to the last message.
- the Life Check Manager ensures that communication between the control center process and the MDS controller is functional. A breakdown in the communication connection and a failure of the devices involved can thus be detected. Sign-of-life messages are exchanged between the control center process and the MDS controller.
- the Life Check Manager receives the sign of life messages from the control center process and passes the information on to the MDS controller. This sends feedback to the Life Check Manager. The feedback is packaged in an XML sign-of-life message and sent to the control center process. 7 shows the signal flow of the sign-of-life messages.
- the MDS controller monitors whether it regularly receives a Life_Check telegram from the XML server. If the telegram fails due to a communication fault or the failure of the XML server or control center process, the MDS controller brings the drive into a safe state and reports an error. The reply to the Life_Check telegram that is sent to the XML server serves as a sign of life for the MDS controller. If there is no response due to a communication fault or a failure of the MDS controller, no Life_Check_Response message is sent to the control center process. The latter can therefore notice the failure of the MDS controller or the communication fault and react appropriately. If the XML server fails, no sign-of-life messages are forwarded. Both the control center process and the MDS controller can react and bring the drive into a safe state.
- Numerical values are used as the sign of life message, which the control center process sends to the XML server in an understandable manner according to the user's specifications.
- the numerical value is passed through to the MDS controller and sent back to the control center process in the Life_Check_Response message. This checks whether the received value is the same as the one sent and increments the next value to be sent by 1.
- the sign-of-life monitoring can be configured with the aid of a configuration message "Life_Check_lnitialize".
- the time period must be defined by a controller and bindingly specified to the XML server ( ⁇ Timeout> in milliseconds) after which the MDS controller reacts in the event of a sign of life failure from the XML server or control center process.
- the response to a sign of life failure can be configured in various operating states.
- the stop processes listed in connection with the deactivation command "SW_Stop" apply to the reaction.
- a default behavior is provided that applies to all operating states not explicitly listed in the configuration message.
- FIG. 8 schematically shows a network structure with Ethernet as a possible example of use for the drive interface according to the invention.
- the function of the XML server can be integrated in the G-Drive controller or in the other drive, so that the additionally required Ethernet connection and computer hardware are not required.
- FIG. 9 shows the software modules relevant for the XML interface or server in the design as a communication PC.
- the three servers "Function Manager”, “Subscription Manager” and “Life Check Manager” are available on a specific TCP port for communication with the controller and can be addressed using an XML-based protocol Specification of the XML-based protocol of the three servers and the associated communication processes can be seen from the explanations above, in addition the data and log messages required by the Baudis diagnostic system are provided by the XML server.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Computer And Data Communications (AREA)
- Devices For Executing Special Programs (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10343123 | 2003-09-16 | ||
PCT/EP2004/052198 WO2005029208A2 (de) | 2003-09-16 | 2004-09-16 | Prozessrechner-schnittstelle auf der basis einer beschreibungs- oder auszeichnungssprache, insbesondere xml |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1664947A2 true EP1664947A2 (de) | 2006-06-07 |
Family
ID=34352920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04766806A Withdrawn EP1664947A2 (de) | 2003-09-16 | 2004-09-16 | Prozessrechner-schnittstelle auf der basis einer beschreibungs- oder auszeichnungssprache, insbesondere xml |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1664947A2 (de) |
WO (1) | WO2005029208A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1806637A1 (de) * | 2005-12-12 | 2007-07-11 | Siemens Aktiengesellschaft | Verfahren zum Betrieb eines Automatisierungsgerätes und Automatisierungsgerät |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999019782A1 (en) * | 1997-10-13 | 1999-04-22 | Rosemount Inc. | Communication technique for field devices in industrial processes |
DE20004400U1 (de) * | 2000-03-09 | 2001-07-19 | Cooper Power Tools GmbH & Co., 73463 Westhausen | Betriebsnetzwerksystem |
-
2004
- 2004-09-16 WO PCT/EP2004/052198 patent/WO2005029208A2/de not_active Application Discontinuation
- 2004-09-16 EP EP04766806A patent/EP1664947A2/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2005029208A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005029208A8 (de) | 2006-05-18 |
WO2005029208A2 (de) | 2005-03-31 |
WO2005029208A3 (de) | 2005-11-17 |
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