CA2780535A1 - Modular scada system - Google Patents
Modular scada system Download PDFInfo
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- CA2780535A1 CA2780535A1 CA 2780535 CA2780535A CA2780535A1 CA 2780535 A1 CA2780535 A1 CA 2780535A1 CA 2780535 CA2780535 CA 2780535 CA 2780535 A CA2780535 A CA 2780535A CA 2780535 A1 CA2780535 A1 CA 2780535A1
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- cpu
- data
- end devices
- modular
- scada
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- 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
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
A modular supervisory control and data acquisition (SCADA) system having a CPU, a storage device, a Interface board, and one or more expansion boards for connecting end devices such as sensors, operably connected together.
Description
Title: MODULAR SCADA SYSTEM
FIELD OF THE INVENTION
The present invention relates to the field of supervisory control and data acquisition (SCADA) systems. More particularly, the present invention relates to SCADA systems in which signals from end devices such as sensors are transmitted to remote or local devices accessible by users.
BACKGROUND OF THE INVENTION
According to an online article accessible via the Wikipedia website at http://en.wikipedia.org/wiki/SCADA, supervisory control and data acquisition (SCADA) generally refers to industrial control systems that monitor and control industrial, infrastructure, or facility-based processes, as described below:
= Industrial processes include those of manufacturing, production, power generation, fabrication, and refining, and may run in continuous, batch, repetitive, or discrete modes.
= Infrastructure processes may be public or private, and include water treatment and distribution, wastewater collection and treatment, oil and gas pipelines, electrical power transmission and distribution, wind farms, civil defence siren systems, and large communication systems.
= Facility processes occur both in public facilities and private ones, including buildings, airports, ships, and space stations. They monitor and control HVAC, access, and energy consumption.
Furthermore, a SCADA system usually consists of the following subsystems:
= A human-machine interface or HMI is the apparatus which presents process data to a human operator, and through this, the human operator monitors and controls the process.
FIELD OF THE INVENTION
The present invention relates to the field of supervisory control and data acquisition (SCADA) systems. More particularly, the present invention relates to SCADA systems in which signals from end devices such as sensors are transmitted to remote or local devices accessible by users.
BACKGROUND OF THE INVENTION
According to an online article accessible via the Wikipedia website at http://en.wikipedia.org/wiki/SCADA, supervisory control and data acquisition (SCADA) generally refers to industrial control systems that monitor and control industrial, infrastructure, or facility-based processes, as described below:
= Industrial processes include those of manufacturing, production, power generation, fabrication, and refining, and may run in continuous, batch, repetitive, or discrete modes.
= Infrastructure processes may be public or private, and include water treatment and distribution, wastewater collection and treatment, oil and gas pipelines, electrical power transmission and distribution, wind farms, civil defence siren systems, and large communication systems.
= Facility processes occur both in public facilities and private ones, including buildings, airports, ships, and space stations. They monitor and control HVAC, access, and energy consumption.
Furthermore, a SCADA system usually consists of the following subsystems:
= A human-machine interface or HMI is the apparatus which presents process data to a human operator, and through this, the human operator monitors and controls the process.
= A supervisory (computer) system, gathering (acquiring) data on the process and sending commands (control) to the process.
= Remote terminal units (RTUs) connecting to sensors in the process, converting sensor signals to digital data and sending digital data to the supervisory system.
= Programmable logic controller (PLCs) used as field devices because they are more economical, versatile, flexible, and configurable than special-purpose RTUs.
= Communication infrastructure connecting the supervisory system to the remote terminal units.
= Various process and analytical instrumentation.
A problem with current SCADA systems for monitoring end devices, such as sensors, at for example oil and gas facilities, is that they are expensive and once set up are not easily configurable to monitor additional or different end devices.
Accordingly, there is a further need for improvements in SCADA system designs.
SUMMARY OF THE INVENTION
What is desired is an improved SCADA system for monitoring end devices, such as sensors, and relaying the data collected from the sensors to a remote user, which is modular allowing additional end devices to be easily added to the system, or existing end devices to be easily exchanged for different end devices.
According to the preferred embodiment of the present invention, the modular SCADA system uses expansion boards and interface boards to permit connection of one or more different end devices to a CPU.
According to an aspect of the present invention, the CPU includes a USB port configured for connecting a USB modem for connecting the CPU to the internet, as an inexpensive alternative to currently available cellular modem implementations.
BRIEF DESCRIPTION OF THE DRAWINGS
Reference will now be made to the preferred embodiments of the present invention with reference, by way of example only, to the following drawings in which:
Figure 1 is a diagram of a modular SCADA system according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention is described in more detail with reference to exemplary embodiments thereof as shown in the appended drawing. While the present invention is described below including preferred embodiments, it should be understood that the present invention is not limited thereto. Those of ordinary skill in the art having access to the teachings herein will recognize additional implementations, modifications, and embodiments which are within the scope of the present invention as disclosed and claimed herein.
A modular supervisory control and data acquisition (SCADA) system 10 according to an embodiment of the present invention is shown in Figure 1. As shown, the modular SCADA system 10 includes a CPU 12 which is connected to at least one interface board 16, preferably by a ten pin ribbon cable. The interface board 16 is connected to one or more expansion boards 18, preferably by a six pin connector. Each expansion board 18 is connected to one or more end devices 28, such as for example sensors.
The CPU 12 receives input from a user 20 via one or more input devices 22.
Examples of input devices 22 are buttons on a panel 23, cellular phones, smart phones, computers, USB thumb drives, and the like. Other forms of input devices 22 will be appreciated by persons skilled in the art, and all such ipnut devices are contemplated by the present invention. Thus, a user 20 can interact with the CPU 12 locally via for example the bottons on a panel 23, the USB thumb drive, or directly connected computer or other device (for example with a wired connection such as ethernet or wireless connection such as Bluetoothe). Alternately, a user 20 can interact with the CPU 12 remotely via for example a cellular connection, a wired internet connection (i.e. via ethernet), a wireless internet connection (i.e. via a cellular modem, preferably USB
modem such as Rogers RocketTM Stick).
According to a preferred embodiment, the CPU 12 comprises an ethernet connector, a microprocessor 13, a USB host port (i.e. for connecting a USB
cellular modem such as a Rogers RocketTM Stick, or a USB thumb drive), a LCD screen 21, and one or more buttons 23. Optionally, the CPU 12 can also include a Bluetoothe module or a cellular modem module (not shown).
Preferably, the CPU 12 operates using a version of the Linux operating system.
The CPU 12 coordinates the retrieval of data from end devices 28, such as for example sensors, connected to expansion boards 18. The CPU 12 retrieves the data from the end devices 28 by first scanning digital I/O pins 24, searching for expansion boards 18 connected to the interface board 16. Preferably, the CPU 12 looks for the attached expansion boards 18 by sending a digital signal to the interface board 16, which in turn forwards the digital signals to the expansion boards 18.
If an expansion board 18 is connected to a digital I/O pin 24 on the interface board 16, a relay 27 on the expansion board 18, which is normally in an open configuration to prevent transmission of data thereacross, is closed, to thereby permit data transmission thereacross, and the expansion board 18 transmits the data it has acquired from end devices 28 by sending it to the interface board over a serial UART connection. The interface board 16 then forwards this data to the CPU 12 via the ten pin ribbon connection, and the CPU 12 stores that data on the associated storage device 14..
Each expansion board 18 has a microcontroller 26 which is responsible for reading any attached end devices 28 (i.e. sensors), doing the necessary data conversion, and sending the serial data from the end devices 28 to relay 27.
In other words, the expansion board 18 relays the signals from the end devices 28 to the CPU 12 as data which the CPU is configured to process. Examples of end devices 28 which are sensors include thermocouples (i.e. for reading temperature), pressure gauges (i.e for reading hydraulic pressure), RPM
sensors, and voltage sensors (i.e. for reading voltages of batteries or switches).
According to a preferred embodiment, each microcontroller 26 has terminals to connect to wires emanating from end devices 28. The microcontroller 26 is connected to relay 27 which, as mentioned above is normally in an open configuration until closed in response to a signal from the CPU 12. Thus the microcontroller 26 is continually transmitting data from sensor 28 to the relay 27, but until the relay 27 is closed, thereby releasing the flow of data to the interface board 16, the data is dead-ended to a non-connected leg of the relay 27.
The CPU 12 scans across all of the potentially attached expansion boards 18 . .
= Remote terminal units (RTUs) connecting to sensors in the process, converting sensor signals to digital data and sending digital data to the supervisory system.
= Programmable logic controller (PLCs) used as field devices because they are more economical, versatile, flexible, and configurable than special-purpose RTUs.
= Communication infrastructure connecting the supervisory system to the remote terminal units.
= Various process and analytical instrumentation.
A problem with current SCADA systems for monitoring end devices, such as sensors, at for example oil and gas facilities, is that they are expensive and once set up are not easily configurable to monitor additional or different end devices.
Accordingly, there is a further need for improvements in SCADA system designs.
SUMMARY OF THE INVENTION
What is desired is an improved SCADA system for monitoring end devices, such as sensors, and relaying the data collected from the sensors to a remote user, which is modular allowing additional end devices to be easily added to the system, or existing end devices to be easily exchanged for different end devices.
According to the preferred embodiment of the present invention, the modular SCADA system uses expansion boards and interface boards to permit connection of one or more different end devices to a CPU.
According to an aspect of the present invention, the CPU includes a USB port configured for connecting a USB modem for connecting the CPU to the internet, as an inexpensive alternative to currently available cellular modem implementations.
BRIEF DESCRIPTION OF THE DRAWINGS
Reference will now be made to the preferred embodiments of the present invention with reference, by way of example only, to the following drawings in which:
Figure 1 is a diagram of a modular SCADA system according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention is described in more detail with reference to exemplary embodiments thereof as shown in the appended drawing. While the present invention is described below including preferred embodiments, it should be understood that the present invention is not limited thereto. Those of ordinary skill in the art having access to the teachings herein will recognize additional implementations, modifications, and embodiments which are within the scope of the present invention as disclosed and claimed herein.
A modular supervisory control and data acquisition (SCADA) system 10 according to an embodiment of the present invention is shown in Figure 1. As shown, the modular SCADA system 10 includes a CPU 12 which is connected to at least one interface board 16, preferably by a ten pin ribbon cable. The interface board 16 is connected to one or more expansion boards 18, preferably by a six pin connector. Each expansion board 18 is connected to one or more end devices 28, such as for example sensors.
The CPU 12 receives input from a user 20 via one or more input devices 22.
Examples of input devices 22 are buttons on a panel 23, cellular phones, smart phones, computers, USB thumb drives, and the like. Other forms of input devices 22 will be appreciated by persons skilled in the art, and all such ipnut devices are contemplated by the present invention. Thus, a user 20 can interact with the CPU 12 locally via for example the bottons on a panel 23, the USB thumb drive, or directly connected computer or other device (for example with a wired connection such as ethernet or wireless connection such as Bluetoothe). Alternately, a user 20 can interact with the CPU 12 remotely via for example a cellular connection, a wired internet connection (i.e. via ethernet), a wireless internet connection (i.e. via a cellular modem, preferably USB
modem such as Rogers RocketTM Stick).
According to a preferred embodiment, the CPU 12 comprises an ethernet connector, a microprocessor 13, a USB host port (i.e. for connecting a USB
cellular modem such as a Rogers RocketTM Stick, or a USB thumb drive), a LCD screen 21, and one or more buttons 23. Optionally, the CPU 12 can also include a Bluetoothe module or a cellular modem module (not shown).
Preferably, the CPU 12 operates using a version of the Linux operating system.
The CPU 12 coordinates the retrieval of data from end devices 28, such as for example sensors, connected to expansion boards 18. The CPU 12 retrieves the data from the end devices 28 by first scanning digital I/O pins 24, searching for expansion boards 18 connected to the interface board 16. Preferably, the CPU 12 looks for the attached expansion boards 18 by sending a digital signal to the interface board 16, which in turn forwards the digital signals to the expansion boards 18.
If an expansion board 18 is connected to a digital I/O pin 24 on the interface board 16, a relay 27 on the expansion board 18, which is normally in an open configuration to prevent transmission of data thereacross, is closed, to thereby permit data transmission thereacross, and the expansion board 18 transmits the data it has acquired from end devices 28 by sending it to the interface board over a serial UART connection. The interface board 16 then forwards this data to the CPU 12 via the ten pin ribbon connection, and the CPU 12 stores that data on the associated storage device 14..
Each expansion board 18 has a microcontroller 26 which is responsible for reading any attached end devices 28 (i.e. sensors), doing the necessary data conversion, and sending the serial data from the end devices 28 to relay 27.
In other words, the expansion board 18 relays the signals from the end devices 28 to the CPU 12 as data which the CPU is configured to process. Examples of end devices 28 which are sensors include thermocouples (i.e. for reading temperature), pressure gauges (i.e for reading hydraulic pressure), RPM
sensors, and voltage sensors (i.e. for reading voltages of batteries or switches).
According to a preferred embodiment, each microcontroller 26 has terminals to connect to wires emanating from end devices 28. The microcontroller 26 is connected to relay 27 which, as mentioned above is normally in an open configuration until closed in response to a signal from the CPU 12. Thus the microcontroller 26 is continually transmitting data from sensor 28 to the relay 27, but until the relay 27 is closed, thereby releasing the flow of data to the interface board 16, the data is dead-ended to a non-connected leg of the relay 27.
The CPU 12 scans across all of the potentially attached expansion boards 18 . .
at high speed, and as it receives the serial data it intelligently determines what data came from what expansion board 18. Preferably, each expansion board 18 has a unique data signature so that the CPU 12 can correctly sort and store the data on the associated storage device 14. Preferably, the storage device 14 is a microSD card operably connected to the CPU 12.
According to one embodiment of the present invention input device 22 is a USB
thumbdrive configured for connection to the CPU 12 via a USB port. When the USB thumbdrive is connected to the CPU 12, the CPU 12 automatically detects the USB thumbdrive, and begins copying all data logs on the storage device 14 to the USB thumbdrive. When the copy is completed, the CPU 12 automatically deletes the data logs on the storage device 14 to conserve space.
According to another embodiment of the present invention input device 22 is a computer, or a smart device such as for example a Blackberry or 'Phone device, which is configured to connect to the CPU 12 via an internet connection facilitated by one or more of an ethernet connection, a cellular modem, a USB
modem (i.e. Rogers RocketTM Stick, or the like. Preferably, the computer, or smart device will be configured to retrieve data stored on the CPU 12 via a downloadable application software or App which interacts with servers accessible via the internet, which servers in turn communicate with the CPU
12, also over the internet. To access the data logs on the storage device 14, the user 20 will operate the App on his/her computer or smart device, which will issue a request over the internet to the servers for some or all of the data stored on the storage device 14 associated with CPU 12. In response to the request, the servers connect, also over the internet, to the CPU 12. In response, the CPU 12 begins copying all data logs on the storage device 14 to the server.
When the copy is completed, the CPU 12 automatically deletes the data logs on the storage device 14 to conserve space.
According to one embodiment of the present invention input device 22 is a USB
thumbdrive configured for connection to the CPU 12 via a USB port. When the USB thumbdrive is connected to the CPU 12, the CPU 12 automatically detects the USB thumbdrive, and begins copying all data logs on the storage device 14 to the USB thumbdrive. When the copy is completed, the CPU 12 automatically deletes the data logs on the storage device 14 to conserve space.
According to another embodiment of the present invention input device 22 is a computer, or a smart device such as for example a Blackberry or 'Phone device, which is configured to connect to the CPU 12 via an internet connection facilitated by one or more of an ethernet connection, a cellular modem, a USB
modem (i.e. Rogers RocketTM Stick, or the like. Preferably, the computer, or smart device will be configured to retrieve data stored on the CPU 12 via a downloadable application software or App which interacts with servers accessible via the internet, which servers in turn communicate with the CPU
12, also over the internet. To access the data logs on the storage device 14, the user 20 will operate the App on his/her computer or smart device, which will issue a request over the internet to the servers for some or all of the data stored on the storage device 14 associated with CPU 12. In response to the request, the servers connect, also over the internet, to the CPU 12. In response, the CPU 12 begins copying all data logs on the storage device 14 to the server.
When the copy is completed, the CPU 12 automatically deletes the data logs on the storage device 14 to conserve space.
While the preferred end devices 28 are sensors as mentioned above, other end devices 28 capable of effecting remote equipment are also contemplated, such as valves, switches, controllers, etc. All such end devices 28 are comprehended by the present invention. According to yet another embodiment of the present invention the App permits the user 20 to activate or deactivate the end devices such as valves, switches, and controllers. In this case, for example, the user 20 will operate the App on his/her computer or smart device, to issue a request over the internet to the servers to activate or deactivate an end device 28. In response to the request, the servers connect, also over the internet, to the CPU 12 which relays a command to the appropriate end device 28 via the interface board 16 and the expansion board 18.
As will now be appreciated, the LCD 21 can be configured to display the data from the end devices 28. Preferably, the CPU 12 is configured to display the data on the LCD 21 in a revolving fashion either automatically based on a preset timing, or in response to a user pressing buttons 23.
Each interface board 16 is shown in Fig. 1 as connecting three expansion boards 18. However, subject to physical size constraints of the assembly of components of the system 10, it is contemplated that more than one end device may be connected to one expansion board 18, more than one expansion board 18 may in turn be connected to an interface board 16, and more than one interface board 16 may in turn be connected to the CPU 12.
The system 10 is preferably powered by electricity, including electricity derived from a solar panel, a battery, a generator, etc. The system 10 can be configured to operate at preferred voltages of 12 to 24 volts DC, and/or 120-volts AC.
Accordingly, it will now be appreciated that the present invention permits a modular SCADA system 10 to be set up at a remote facility, such as for example an oil and gas facility, to monitor parameters of equipment, such as for example a hydraulic pressure of a hydraulic oil well pumping apparatus. The initial system 10 can include a single expansion board 18 connected to the interface board 16, and a single pressure sensor 28 connected to the expansion board 18. However, if at a later date a need arises to also monitor another parameter of the same or a different piece of equipment, such as for example by measuring a temperature of the hydraulic oil well pumping apparatus, an operator simply has to connect a second expansion board 18 to the interface board 16, this second interface board 18 being configured to read data from a temperature sensor 28. Once the second expansion board 18 is connected to the interface board 16, and wires from the temperature sensor are connected to the microcontroller on the second expansion board 18, the CPU 12 will automatically begin receiving the serial data from the temperature sensor 28, and store it on the storage device 14, and optionally display it on the LCD
display 21.
While reference has been made to various preferred embodiments of the invention other variations, implementations, modifications, alterations and embodiments are comprehended by the broad scope of the appended claims.
Some of these have been discussed in detail in this specification and others will be apparent to those skilled in the art. Those of ordinary skill in the art having access to the teachings herein will recognize these additional variations, implementations, modifications, alterations and embodiments, all of which are within the scope of the present invention, which invention is limited only by the appended claims.
As will now be appreciated, the LCD 21 can be configured to display the data from the end devices 28. Preferably, the CPU 12 is configured to display the data on the LCD 21 in a revolving fashion either automatically based on a preset timing, or in response to a user pressing buttons 23.
Each interface board 16 is shown in Fig. 1 as connecting three expansion boards 18. However, subject to physical size constraints of the assembly of components of the system 10, it is contemplated that more than one end device may be connected to one expansion board 18, more than one expansion board 18 may in turn be connected to an interface board 16, and more than one interface board 16 may in turn be connected to the CPU 12.
The system 10 is preferably powered by electricity, including electricity derived from a solar panel, a battery, a generator, etc. The system 10 can be configured to operate at preferred voltages of 12 to 24 volts DC, and/or 120-volts AC.
Accordingly, it will now be appreciated that the present invention permits a modular SCADA system 10 to be set up at a remote facility, such as for example an oil and gas facility, to monitor parameters of equipment, such as for example a hydraulic pressure of a hydraulic oil well pumping apparatus. The initial system 10 can include a single expansion board 18 connected to the interface board 16, and a single pressure sensor 28 connected to the expansion board 18. However, if at a later date a need arises to also monitor another parameter of the same or a different piece of equipment, such as for example by measuring a temperature of the hydraulic oil well pumping apparatus, an operator simply has to connect a second expansion board 18 to the interface board 16, this second interface board 18 being configured to read data from a temperature sensor 28. Once the second expansion board 18 is connected to the interface board 16, and wires from the temperature sensor are connected to the microcontroller on the second expansion board 18, the CPU 12 will automatically begin receiving the serial data from the temperature sensor 28, and store it on the storage device 14, and optionally display it on the LCD
display 21.
While reference has been made to various preferred embodiments of the invention other variations, implementations, modifications, alterations and embodiments are comprehended by the broad scope of the appended claims.
Some of these have been discussed in detail in this specification and others will be apparent to those skilled in the art. Those of ordinary skill in the art having access to the teachings herein will recognize these additional variations, implementations, modifications, alterations and embodiments, all of which are within the scope of the present invention, which invention is limited only by the appended claims.
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A modular supervisory control and data acquisition (SCADA) system substantially as shown and described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2780535 CA2780535A1 (en) | 2012-06-21 | 2012-06-21 | Modular scada system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2780535 CA2780535A1 (en) | 2012-06-21 | 2012-06-21 | Modular scada system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2780535A1 true CA2780535A1 (en) | 2013-12-21 |
Family
ID=49769758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2780535 Abandoned CA2780535A1 (en) | 2012-06-21 | 2012-06-21 | Modular scada system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2780535A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9845789B2 (en) | 2014-10-23 | 2017-12-19 | General Electric Company | System and method for monitoring and controlling wind turbines within a wind farm |
| CN109799752A (en) * | 2019-01-15 | 2019-05-24 | 中国联合网络通信集团有限公司 | Data acquisition device |
| CN110297456A (en) * | 2018-03-23 | 2019-10-01 | 中国石油化工股份有限公司 | A kind of regulator control system and method for the electrical integrated supply process of oil |
-
2012
- 2012-06-21 CA CA 2780535 patent/CA2780535A1/en not_active Abandoned
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9845789B2 (en) | 2014-10-23 | 2017-12-19 | General Electric Company | System and method for monitoring and controlling wind turbines within a wind farm |
| CN110297456A (en) * | 2018-03-23 | 2019-10-01 | 中国石油化工股份有限公司 | A kind of regulator control system and method for the electrical integrated supply process of oil |
| CN110297456B (en) * | 2018-03-23 | 2020-10-16 | 中国石油化工股份有限公司 | System and method for regulating and controlling oil-electricity integrated supply process |
| CN109799752A (en) * | 2019-01-15 | 2019-05-24 | 中国联合网络通信集团有限公司 | Data acquisition device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20150623 |