Title of Invention

AN EMBEDDED DEVICE FOR INERFACING ELECTRONIC CONTROLLERS OF ELECTROSTATIC PRECIPITATOR

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;

Documents:

00398-kol-2007-abstract.pdf

00398-kol-2007-claims.pdf

00398-kol-2007-correspondence others.pdf

00398-kol-2007-correspondence-1.1.pdf

00398-kol-2007-description(complete).pdf

00398-kol-2007-drawings.pdf

00398-kol-2007-form-1.pdf

00398-kol-2007-form-18.pdf

00398-kol-2007-form-2.pdf

00398-kol-2007-form-3.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-ABSTRACT 1.1.pdf

398-KOL-2007-CLAIMS.pdf

398-KOL-2007-CORRESPONDENCE.pdf

398-KOL-2007-DESCRIPTION (COMPLETE) 1.1.pdf

398-KOL-2007-DRAWINGS 1.1.pdf

398-KOL-2007-EXAMINATION REPORT REPLY RECIEVED.pdf

398-KOL-2007-EXAMINATION REPORT.pdf

398-KOL-2007-FORM 1 1.1.pdf

398-KOL-2007-FORM 18.pdf

398-KOL-2007-FORM 2 1.1.pdf

398-KOL-2007-FORM 3.pdf

398-KOL-2007-GPA.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-OTHERS 1.1.pdf

398-KOL-2007-REPLY TO EXAMINATION REPORT.pdf


Patent Number 253793
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
Inventors:
# Inventor's Name Inventor's Address
1 BALAKRISHNAN VENKATESHWAR BOILER AUXILIARIES PLANT, BHEL, RANIPET-632 406, TAMIL NADU
2 VELU SUBBAN SURESHKUMAR BOILER AUXILIARIES PLANT, BHEL, RANIPET-632 406, TAMIL NADU
3 GOURI SHANKAR NAIK BOILER AUXILIARIES PLANT, BHEL, RANIPET-632 406, TAMIL NADU
4 SMITH BABU KANDATHIL KARTHIKEYA PANICKER BOILER AUXILIARIES PLANT, BHEL, RANIPET-632 406, TAMIL NADU
5 KADAPERI PANCHATSARAM MANIMALA BOILER AUXILIARIES PLANT, BHEL, RANIPET-632 406, TAMIL NADU
PCT International Classification Number G01R31/28; G01R31/28
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA