Title of Invention | AN EMBEDDED DEVICE FOR INERFACING ELECTRONIC CONTROLLERS OF ELECTROSTATIC PRECIPITATOR |
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Abstract | ABSTRACT Title: An embedded device for interfacing electronic controllers of electrostatic precipitator. An embedded system to interface a plurality of field-level control devices and a plant level control and monitoring device of electrostatic precipitators, the devices having different communication protocols, the system comprising an embedded device (09) having a core module based processor (01) embedded with a flash memory to store a software module; at least four hardware blocks (2, 3, 4, 5) each incorporating respectively a first circuit for +/10mA current loop communication (02), a second circuit of CAN communication (03), a third circuit for RS-485 communication (04), and a fourth circuit for Ethernet communication (05), each of the four circuits (02, 03, 04, 05) adapting respective transreceiver for interfacing the communication channels of the processor (01); the first circuit (02) interfacing the field level control devices (22-27) based on specific protocol, via a first port (06), the second circuit (03) interfacing the field level control devices (32-36) based on CAN protocol via a second port (07), the third circuit (04) interfacing the plant level control and monitoring device (20) based on MODBUS protocol via a third port (08), and the fourth circuit (05) interfacing the plant level control and monitoring device (20) based on MODBUS TCP protocol via an Ethernet port; |
Full Text | FIELD OF INVENTION The invention relates to an embedded hardware device for interfacing control and monitoring devices of electrostatic precipitator with different communication protocol. More particularly, the invention relates to a data communication protocol conversion system for interfacing high voltage transformer/rectifier controller and plant level controller of electrostatic precipitator. BACKGROUND OF THE INVENTION Electrostatic precipitators are pollution control equipments controlled and monitored by field level controllers and plant level controller. The field level controllers like high voltage transformer/rectifier and rapper motor controller are capable of controlling the operating parameters of electrostatic precipitator from its local control panel. These controllers can also be operated from a remote location by a single integrated system. Often the field level controllers are controlled and monitored by the plant level controller. Generally, the field level controllers and the plant level controller have different communication protocol. There are various types of field controllers that communicate over various protocols. The communication control device includes hardware circuit and software of respective type of protocols. The communication protocols comprise specific protocol and standard protocol. Some of the field level controllers have specific protocol and some other field level controllers have standard protocol. Normally plant level controllers communicate over standard protocol. In order to communicate control and monitoring parameters between field level controllers and plant level controller, transmitted message / data frame is to be reformatted to suit with protocol of the receiving controller. The reformatted data frame has to be transmitted through the respective hardware circuit. In some of the prior art, general-purpose communication protocol converting devices are found, which convert one protocol to another protocol and vice versa. The field level controller of electrostatic precipitator have specific protocol and Controller Area Network (CAN) protocol. In the prior art there is no device found for interfacing field level controller and plant level controller of electrostatic precipitator. OBJECTS OF THE INVENTION It is therefore an object of the invention is to propose an embedded system to interface various control and monitoring devices of electrostatic precipitator, the devices having different communication protocol. Another object of the invention is to propose an embedded system to interface various control and monitoring devices of electrostatic precipitator, the devices having different communication protocol, which is capable to receive and transmit through +/- 10mA current loop communication, RS-485 communication, CAN bus communication and Ethernet communication. Yet another object of the invention is to propose an embedded system to interface various control and monitoring devices of electrostatic precipitator, the devices having different communication protocol which enables communication over specific protocol, MODBUS protocol, MODBUS TCP protocol and CAN protocol. Still another object of the invention is to propose an embedded system to interface various control and monitoring devices of electrostatic precipitator, the devices having different communication protocol which is capable of loading and operating means to translate message / data received from field level controllers to message / data in accordance with protocol of plant level controller, and vice versa. A further object of the invention is to propose an embedded system to interface various control and monitoring devices of electrostatic precipitator, the devices having different communication protocol which provides communication interface between specific protocol based field level controllers and MODBUS or MODBUS TCP based protocol based plant level controller. A still further object of the invention is to propose an embedded system to interface various control and monitoring devices of electrostatic precipitator, the devices having different communication protocol which provides communication between CAN protocol based field level controllers and MOD BUS protocol based plant level controller. Another object of the invention is to propose an embedded system to interface various control and monitoring devices of electrostatic precipitator, the devices having different communication protocol which provides communication between CAN protocol based field level controllers and MODBUS TCP protocol based plant level controller. SUMMARY OF THE INVENTION Accordingly, the present invention provides an embedded system to interface various control and monitoring devices of electrostatic precipitator the devices having different communication protocol is capable of adapting a plurality types of communication hardware and software protocol. Present invention utilizes core module and peripheral components for implementing the hardware. Core module is an intelligent processor having multiple communication channels, in-built memory, analog and digital inputs. The system has hardware circuit for +/-10mA current loop communication, RS-485 communication, CAN bus communication and Ethernet communication. For each type of communication, separate port is provided, through which respective devices like field level controllers and plant level controller are connected. Communication transreceivers are used in the hardware to interface communication channel of the processor to the physical communication bus. The system has software to transmit and receive message/data in specific protocol, CAN protocol, MODBUS protocol and MODBUS TCP protocol. Software converting message/data from one protocol to other protocol and vice versa. The system provides four communication protocol conversion means, using the first means, the system converts message/data in specific protocol format to MODBUS protocol format and message/data in MODBUS protocol format to specific protocol format. By using the second means, the system converts message/data in specific protocol to MODBUS TCP protocol format to specific protocol format. The third means of the system converts data in CAN protocol format to CAN protocol format. The system further converts data received in CAN protocol format to MODBUS TCP protocol format and data received in MODBUS TCP protocol format to CAN protocol format using the fourth means. In each case, the system receives massage/data frame from a first communicated controller and reformat in accordance to the protocol of a second communication controller. Similarly it receives message/data frame from the second communication controller and reformat the message/data frame in accordance to the protocol of the first communication controller. BRIEF DESCRIPTION OF THE ACCOMPAYING DRAWING Figure 1 is a hardware block diagram of the embedded system according to the invention. Figure 2 is software logic diagram of the embedded system of the invention. Figure 3 is interface diagram of the embedded system with specific protocol based field level controllers and plant level controller. Figure 4 is interface diagram of the embedded system with CAN protocol based field level controller with plant level controller. DETAILED DECRIPTION OF A PREFERRED EMBODIMENT The hardware block diagram shows an embedded device (09) of the inverted system, for communication protocol conversion of electrostatic precipitator is shown in Figure 1. In the embedded hardware block diagram, the block (01) is a core module based processor. Hardware for four types of communication are shown in four blocks (02, 03, 04, 05). The first block (02) has the circuit for +/-10mA current loop communication. This circuit interfaces the specific protocol based field level controllers through a first port (06). The processor receives data frame through the first block (02) and via the first port (06) and reformat in accordance with the protocol to be transmitted. The processor (01) has a lash memory to store the software. The second block (02) has in the form of a first transreceiver circuit (03) a hardware circuit for CAN communication. CAN protocol based field level controllers are connoted through a second port (07). The processor (01) converts the CAN frame into required protocol format. The third block (04) has a hardware circuit in the form of a second transreceiver circuit (04) for RS-485 communication. MODBUS protocol based plant level controller is connected through a third port (08). The processor ()1) converts the MODBUS frame into required protocol format. The fourth block (5) has an Ethernet port for Ethernet communication (29), MODBUS TCP based plant level controller is connected through the fourth block. The processor (01) converts the MODBUS TCP frame into required protocol format. Figure 2 shows the software logic diagram of the present invention. Software logic (10) is shown in Figure 2. It consists of a main block (11), a plurality of communication driver blocks (13, 15, 17, 19) and a corresponding number of communication protocol conversion blocks (12, 14,16, 18). The main block (11) imitates default values and various tasks to be performed during the operation. A first communication driver block (13) receives and transmits specific protocol based message/data frames. A second driver block (15) receives and transmits CAN protocol based data frames, a third communication driver block (17) receives and transmits MODBUS protocol based communication frames, and a fourth communication driver block (19) receives and transmits MODBUS TCP communication frames. A first communication protocol conversion block (12) converts specific protocol based messages into MODBUS protocol based messages into MODBUS protocol based messages and MODBUS TCP protocol based messages. A first communication protocol conversion block (12) converts specific protocol based messages into MODBUS protocol based messages and MODBUS TCP protocol based messages. A second communication protocol conversion block (14) enables conversion from CAN protocol based messages into MODBUS protocol based messages and MODBUS TCP protocol based messages. A third communication protocol conversion block (16) coverts MODBUS protocol based messages and MODBUS TCP protocol based messages into specific protocol based messages. A fourth communication protocol conversion block (18) converts MODBUS protocol based messages and MODBUS TCP protocol based messages into CAN protocol based messages. Means for receiving and transmitting and means for converting enabling the communication and protocol conversion blocks are stored in the flash memory of the processor. Configuration software is made for selecting the required protocol conversion. Figure 3 shows the interface diagram of the embedded system with specific protocol based field level controllers and MODBUS protocol based plant level controller. Specific communication protocol based field level controllers (22 to 27) are connected through +/-10mA current loop communication circuit (02). They are interfaced to the plant level controller (20) adapting the embedded protocol converting device (09) through a RS-485 communication bus (38). Figure 4 shows interface diagram of the embedded device (09) with CAN protocol based field level controllers and MODBUS TCP protocol based plant level controller of electrostatic precipitator. Field level controllers with CAN communication protocol (32 to 36) are connected over a CAN bus (37). They are interfaced with the plant level controller (20) through Ethernet communication (29) adapting the invented communication protocol converter (09). The communication bus (37) is terminated by the terminating resistors (30, 31). WE CLAIM 1. An embedded system to interface a plurality of field-level control devices and a plant level control and monitoring device of electrostatic precipitators, the devices having different communication protocols, the system comprising: - an embedded device (09) having a core module based processor (01) embedded with a flash memory to store a software module; at least four hardware blocks (2, 3, 4, 5) each incorporating respectively a first circuit for +/10mA current loop communication (02), a second circuit of CAN communication (03), a third circuit for RS-485 communication (04), and a fourth circuit for Ethernet communication (05), each of the four circuits (02, 03, 04, 05) adapting respective transreceiver for interfacing the communication channels of the processor (01). - the first circuit (02) interfacing the field level control devices (22-27) based on specific protocol, via a first port (06), the second circuit (03) interfacing the field level control devices (32-36) based on CAN protocol via a second port (07), the third circuit (04) interfacing the plant level control and monitoring device (20) based on MODBUS protocol via a third port (08), and the fourth circuit (05) interfacing the plant level control and monitoring device (20) based on MODBUS TCP protocol via an Ethernet port; - the processor (01) converting the frames of each of the plurality protocols into respective format adaptable to the plant level control and monitoring device and/or the field level control devices; - an embedded module (10) incorporates the flash memory of the embedded device (09), and comprising a main block (11), a plurality of communication driver blocks (13, 15, 17, 19), and a corresponding number of communication protocol conversion blocks (12, 14, 16, 18), the main block (11) initiating default values and performing various tasks during the operation, the driver blocks (13, 15, 17, 119) receiving and transmitting several communication protocol based message/data frame commensurating with the hardware circuits (02, 03, 04, 05), and the protocol conversion blocks (12, 14, 16, 18) converting with the communication protocols having the acceptability of the control and monitoring devices. 2. The system as claimed in claim 1, wherein the specific communication protocol based field level controllers (22 to 27) are connected through the first circuit (02) and being interfaced with the plant level control and monitoring device (20) via the embedded protocol converting device (02) through a RS-485 communication bus (38). 3. The system as claimed in claim 1, wherein the CAN communication protocol based controllers (32 to 36) are connected over a CAN bus (37), and being interfaced with the plant level control and monitoring device (20) through Ethernet communication (29) via the embedded protocol converting device (09), the CAN bus (37) being terminated by terminating resistors (30, 31). 4. An embedded system to interface a plurality of field-level control devices and a plant level control and monitoring device of electrostatic precipitators as substantially described herein with reference to the accompanying drawings. ABSTRACT Title: An embedded device for interfacing electronic controllers of electrostatic precipitator. An embedded system to interface a plurality of field-level control devices and a plant level control and monitoring device of electrostatic precipitators, the devices having different communication protocols, the system comprising an embedded device (09) having a core module based processor (01) embedded with a flash memory to store a software module; at least four hardware blocks (2, 3, 4, 5) each incorporating respectively a first circuit for +/10mA current loop communication (02), a second circuit of CAN communication (03), a third circuit for RS-485 communication (04), and a fourth circuit for Ethernet communication (05), each of the four circuits (02, 03, 04, 05) adapting respective transreceiver for interfacing the communication channels of the processor (01); the first circuit (02) interfacing the field level control devices (22-27) based on specific protocol, via a first port (06), the second circuit (03) interfacing the field level control devices (32-36) based on CAN protocol via a second port (07), the third circuit (04) interfacing the plant level control and monitoring device (20) based on MODBUS protocol via a third port (08), and the fourth circuit (05) interfacing the plant level control and monitoring device (20) based on MODBUS TCP protocol via an Ethernet port; |
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00398-kol-2007-correspondence others.pdf
00398-kol-2007-correspondence-1.1.pdf
00398-kol-2007-description(complete).pdf
00398-kol-2007-general power of attorney.pdf
398-KOL-2007-(20-07-2012)-PA-CERTIFIED COPIES.pdf
398-KOL-2007-(26-03-2012)-CORRESPONDENCE.pdf
398-KOL-2007-CORRESPONDENCE.pdf
398-KOL-2007-DESCRIPTION (COMPLETE) 1.1.pdf
398-KOL-2007-EXAMINATION REPORT REPLY RECIEVED.pdf
398-KOL-2007-EXAMINATION REPORT.pdf
398-KOL-2007-GRANTED-ABSTRACT.pdf
398-KOL-2007-GRANTED-CLAIMS.pdf
398-KOL-2007-GRANTED-DESCRIPTION (COMPLETE).pdf
398-KOL-2007-GRANTED-DRAWINGS.pdf
398-KOL-2007-GRANTED-FORM 1.pdf
398-KOL-2007-GRANTED-FORM 2.pdf
398-KOL-2007-GRANTED-SPECIFICATION.pdf
398-KOL-2007-REPLY TO EXAMINATION REPORT.pdf
Patent Number | 253793 | ||||||||||||||||||
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Indian Patent Application Number | 398/KOL/2007 | ||||||||||||||||||
PG Journal Number | 35/2012 | ||||||||||||||||||
Publication Date | 31-Aug-2012 | ||||||||||||||||||
Grant Date | 24-Aug-2012 | ||||||||||||||||||
Date of Filing | 15-Mar-2007 | ||||||||||||||||||
Name of Patentee | BHARAT HEAVY ELECTRICALS LIMITED | ||||||||||||||||||
Applicant Address | REGIONAL OPERATIONS DIVISION (ROD), PLOT NO.9/1 DJBLOCK, 3rd FLOOR, KARUNAMOYEE, SALT LAKE CITY, KOLKATA 700091, having Registered Office at BHEL HOUSE, SIRI FORT, NEW DELHI 110049, INDIA | ||||||||||||||||||
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PCT International Classification Number | G01R31/28; G01R31/28 | ||||||||||||||||||
PCT International Application Number | N/A | ||||||||||||||||||
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