KR20110092079A - Plant multiplexing control system using serial communication - Google Patents

Abstract

PURPOSE: A plant multiplexing control system using serial communication is provided to improve the reliability of a plat by preventing the decrease of an output signal for controlling the system plant. CONSTITUTION: In a plant multiplexing control system using serial communication, an input terminal part(710) duplicates one input electrical signal into a plurality of input signals Input-output units(721~723) changes a plurality of input signals into a plurality of input signal data. The input-output part changes output signal data into a plurality of output signals. A communications unit(731~733) collects the plural input signal data. A communications unit outputs the output signal data through a plurality of communications ports. A signal processing unit(741~743) processes a plurality of input signal data. An output motor(750) outputs one of output signals to the plant.

Description

Plant multiplexing control system using serial communication {PLANT MULTIPLEXING CONTROL SYSTEM USING SERIAL COMMUNICATION}

The present invention relates to a multiplexing control system applied to a power generation or desalination plant, and more particularly, to improve reliability of the multiplexing control system by preventing the entire operation of the control system from stopping even when a component of a control system fails. A multiplexing control system of a plant that can.

1 is an explanatory diagram of signal and data paths in a conventional plant control system.

As shown in FIG. 1, the conventional plant control system includes an input terminal unit 110, an input / output unit 120, a communication unit 130, a signal processing unit 140, and an output vaulter 150. Here, the input / output unit 120 includes an input unit 121 and an output unit 122. The conventional plant control system is connected to the plant 100 via an input terminal 110 and an output boater 150. The plant 100 is applied to a power generation or freshwater plant.

The input terminal unit 110 receives an input signal from the plant 100 and transmits the input signal to the input unit 121 of the input / output unit 120.

The input unit 121 of the input / output unit 120 processes the electrical input signal of the plant 100 transmitted from the input terminal unit 110 and converts it into digital data, and converts the converted digital data into input signal communication data. Transfer to the communication unit 130. In addition, the output unit 122 of the input / output unit 120 interprets the output signal communication data transmitted from the communication unit 130 and converts it into an electrical output signal for controlling the plant.

The communicator 130 structures the input signal communication data transmitted from the input / output unit 120 to transfer the structured input signal data to the signal processor 140. In addition, the communicator 130 converts the structured output signal data transmitted from the signal processor 140 into output signal communication data and transmits the converted output signal data to the output unit 121 of the input / output unit 120.

The signal processor 140 generates a structured data by performing a logic operation for control based on the structured input signal data transmitted from the communicator 130, and then transfers the structured data to the communicator 130 using an interface.

The output boater 150 selects the electrical output signal converted by the output unit 122 of the input / output unit 120 according to the voting logic and outputs the output signal to the plant 100. Here, the voting logic means voting to select one of the multiplexed output signals for controlling the plant 100.

The plant control system described above has a multiplexing structure to ensure the reliability and stability of the control system. Here, multiplexing generally consists of redundancy and triplet. Redundancy control or triple control means that the same control system consists of two or three systems.

2 is a block diagram of a conventional plant multiplexing control system.

As shown in FIG. 2, the conventional plant multiplexing control system includes an input terminal unit 210, first to third input / output units 221 to 223, first to third communication units 231 to 233, and first to third units. And a third signal processor 241 to 243, an output vaulter 250, and the like. Conventional plant multiplexing control system may be made of a redundant or tripled, as shown in Figure 2, the plant triple control system may include three input and output unit, communication unit, three signal processing unit.

Hereinafter, each component of the triple control system will be described.

The input terminal unit 210 copies the signals measured by sensors or gauges installed in the plant 100 into two or three signals according to the multiplexing number, and transmits the signals to each input / output unit 221 to 223. That is, the signal X coming from the sensor or gauge of the plant 100 is copied from the input terminal unit 210 to the same signals I_1, I_2, and I_3 so that the I / O modules (eg, I / O) of each input / output unit 221 to 223 are copied. O module 1_1, I / O module 2_1 and I / O module 3_1).

Hereinafter, the first input / output unit 221, the first communication unit 231, and the first signal processing unit 241 among three input / output units, communication units, and signal processing units will be described. The other input / output unit, communication unit, and signal processing unit perform the same operation.

The first input / output unit 221 receives a signal copied from the input terminal unit 210, converts an electrical signal into communication data which is digital data, and collects data of the first input / output unit 221. Transfer communication data to). In addition, the first input / output unit 221 receives the processed signals from the first communication unit 231, converts them into electrical output signals, and transmits them to the output bottler 250. The first input / output unit 221 includes a plurality of I / O modules for receiving an input signal from the input terminal unit 210 and outputting one output signal processed by the first communication unit 231.

The first communication unit 231 is connected to the first input / output unit 221, and the communication data transferred from the first input / output unit 221 structures data collected by various I / O modules to form a standard data bus (eg, VMEbus). Or CompactPCI, etc.) to the first signal processor 241 in a reliable and verified interface method.

The first signal processor 241 processes the structured input signal data transmitted from the first communication unit 231 according to a logic operation, and outputs the processed signal to the first communication unit 231.

For example, the communication data C_1, C_2, and C_3 output from the I / O module of the first input / output unit 221 are input to the first signal processing unit 241 through the first communication unit 231. That is, the first signal processor 241 processes the input signal data C_1 transmitted from the first communication unit 231 according to a logic operation. The signal processed by the first signal processor 241 is transmitted to the I / O module of the first input / output unit 221 again through the first communication unit 231.

The output bottler 250 receives the multiplexed signals O_1, O_2, and O_3 from the input / output units 221 to 223 and selects the value 'Y' corresponding to the same two signals among the three signals according to a plurality of priority logics. Output to plant 100.

3 is an explanatory diagram for a case where a failure occurs in a conventional plant multiplexing control system.

)가 표시된다.As shown in FIG. 3, in such a plant triple control system, failures 301 and 302 occur in any one of the first input / output unit 221, the first communication unit 231, and the first signal processing unit 241. If so, the entire operation (input, output, communication, signal processing) of the failed control system is stopped and the plant 100 is controlled by the remaining control system (eg, the second or third control system). Here, when the faults 301 and 302 occur in any one of the first input / output unit 221, the first communication unit 231, and the first signal processing unit 241, the fault symbol (

) Is displayed.

That is, input / output, communication, or signal processing of any one of the first to third input / output units 221 to 223, the first to third communication units 231 to 233, and the first to third signal processing units 241 to 243. In case of failure of the multiplexing system, the total number of signals input from the plant 100 to the control system is reduced because the entire control system is not available, and thus the number of output signals for controlling the plant 100 is also reduced. There is a problem of low reliability.

4 is a detailed configuration diagram of the output boater of FIG. 2.

As shown in FIG. 4, in the conventional plant multiplexing control system, the output renderer 250 receives three output signals O_1, O_2, and O_3, and performs a switch for performing on / off operations of six output signals. 410, a multiplier 420 multiplying the output signals of the different switches 410, and an adder 430 summing the total output signals of the multipliers 420.

When the output boater 250 outputs the signal Y for controlling the plant 100, the output voltage receiving unit 250 receives an output signal from the first to third input / output units 221 to 223 and outputs an output value according to a plurality of priorities through an internal circuit. Determine. That is, the output bottler 250 receives the signals O_1, O_2, and O_3 from the input / output units 221 to 223 and outputs a result of the sum of the logical products of the signals through the circuit logic shown in FIG. 4. The output signal Y of the output bottler 250 is represented by Equation 1 below.

Here, Y represents the final output signal output to the plant 100, and A, B and C represents the output signal transmitted from each input and output unit (221 to 223).

5 is an explanatory diagram for a steady state output in the output boater of FIG. 4.

The output bottler 250 generates a final output value by an on / off operation of the switch 410 such as a relay, a multiplication operation of the multiplier 420, and an addition operation of the adder 430.

As shown in FIG. 5, when the output boater 250 receives the multiplexed signals O_1, O_2, and O_3, the multiplexed signals O_1, O_2, and O_3 are A, B of the output boater 250. Becomes C. When A, B, and C, which are input signals of the output bottler 250, are A = 1, B = 0, and C = 1, the final output value Y is represented by Equation 1 above, where Y = 1 * 0 + 0 * 1 + 1 * 1 = 1 That is, the output signal of the output vaulter 250 is generally output in accordance with the circuit logic, the final output signal Y is the logical sum of the logical product of A * B, B * A, C * A. Here, if the logical sum of the logical product is 1 or more, the output signal outputs 1.

FIG. 6 is an explanatory diagram for a failure state output in the output vaulter of FIG. 4. FIG.

Since the relay switch 410 that determines the electrical output inside the output bowler 250 of FIG. 4 may have a lifetime limitation or failure, the final output value may be changed if the relay switch 410 is damaged or malfunctions. .

In one example, the output boater 250 receives the multiplexed signals O_1, O_2, and O_3 output from the first to third input / output units 221 to 223. Here, when the input values A, B, and C are A = 1, B = 0, and C = 1, the final output value applies Y = A * B + B * C + C * A of Equation 1 above. The value of the final output should be Y = 1.

)로 표시한다. 이와 같이, 전기적 출력을 하는 하나의 스위치(601)에 고장(

)이 발생할 경우에 실제 최종 출력은 Y=0이 된다.However, as shown in FIG. 6, when a failure occurs in any one of the relay switches 410 of the output boater 250, the final final output is Y = 1 * 0 + differently from FIG. 5. 0 * 1 + 1 * 0 = 0 and the final output is Y = 0. Here, the failed switch 601 is a failure symbol (

). In this way, a failure of one switch 601 for electrical output (

), The actual final output is Y = 0.

The output boater 250 of the conventional plant multiplexing control system may generate different output values when a failure or malfunction of the internal switch occurs, thereby reducing the reliability of the multiplexing system.

The present invention was devised to solve the above problems, and an object of the present invention is to control the plant so that the entire operation of the control system is not stopped even if a failure occurs in any control system component in the multiplexed control system. It is an object of the present invention to provide a multiplexing control system of a plant that can improve the reliability of plant control by not reducing the number of output signals.

In addition, another object of the present invention is to provide a multiplexing control system of the plant that can improve the reliability of the plant control by not affecting the final output value even if the internal switch of the output boat breaks or malfunctions.

To this end, the multiplexing control system of a plant using serial communication according to the present invention, an input terminal unit for copying one electrical input signal input from the plant into a plurality of input signals; An input / output unit for converting the plurality of copied input signals into a plurality of input signal data and converting output signal data output from the communication unit into a plurality of output signals; The communication unit for collecting the converted plurality of input signal data using a plurality of communication ports and outputting output signal data output from a signal processing unit to the input / output unit through the plurality of communication ports; The signal processor for signal-processing the collected plurality of input signal data and outputting output signal data; And determining one output signal from among the plurality of output signals output from the input / output unit and outputting the output signal to the plant, wherein the outputted plurality of output signals are duplicated and the plurality of duplicated output signals are output according to a plurality of priorities. And an outputbotter for determining one of the output signals by performing AND and OR operation.

The present invention improves the reliability of plant control by not reducing the number of output signals for controlling the plant by preventing the entire operation of the control system from stopping even if a component of a control system in the multiplexing control system fails. It can be effected.

In addition, the present invention has the effect that the reliability of the plant control can be improved by not affecting the final output value even if the internal switch of the output boat fails or malfunctions.

1 is an explanatory diagram of a signal and a data path in a conventional plant control system;
2 is a block diagram of a conventional plant multiplexing control system,
3 is an explanatory diagram for a case where a failure occurs in a conventional plant multiplexing control system;
4 is a detailed configuration diagram of the output boater of FIG. 2;
5 is an explanatory diagram for a steady state output in the output vaulter of FIG. 4;
6 is an explanatory diagram of a failure state output in the output vaulter of FIG. 4;
7 is a configuration diagram of an embodiment of a plant multiplexing control system according to the present invention;
8 is an exemplary explanatory diagram for failure control in the plant multiplexing control system of FIG. 7 according to the present invention;
9 is a diagram illustrating an embodiment of a signal flow in the plant multiplexing control system of FIG. 7 according to the present invention;
10 is a diagram illustrating an embodiment of a signal flow in the case of fault control in the plant multiplexing control system of FIG. 8 according to the present invention;
FIG. 11 is a detailed configuration diagram of an embodiment of the output boater of FIG. 7 according to the present invention. FIG.
Description of the Related Art
710: input terminal unit 720: input and output unit
731 to 733: first to third communication unit
741 to 743: First to third signal processing units
750: output potter

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The configuration of the present invention and the operation and effect thereof will be clearly understood through the following detailed description. Prior to the detailed description of the present invention, the same components will be denoted by the same reference numerals even if they are displayed on different drawings, and the detailed description will be omitted when it is determined that the well-known configuration may obscure the gist of the present invention. do.

7 is a configuration diagram of an embodiment of a plant multiplexing control system according to the present invention.

As illustrated in FIG. 7, the plant multiplexing control system according to the present invention includes an input terminal unit 710, an input / output unit 720, first to third communication units 731 to 733, and first to third signal processing units ( 741 to 743 and an output batter portion 750. Here, the first to third communication units 731 to 733 include communication ports 1 to 3, respectively. As illustrated in FIG. 7, the first to third input / output units 721 to 723 are connected to the communication ports 1 to 3 of each communication unit 731 to 733, respectively. In addition, communication ports 1 to 3 of each communication unit 731 to 733 are connected to communication ports 1 to 3 each having the same port number of another communication unit. As such, each communication unit 731 to 733 includes three communication ports, and communication ports of the corresponding numbers are connected to each other. RS-485 multi-drop and daisy chain schemes are used between the first to third communication units 731 to 733 and the input / output unit 720.

The plant multiplexing control system according to the present invention may be made redundant or tripled, and as shown in FIG. 7, the plant triplexing control system includes first to third input / output units 721 to 723 and first to third communication units 731 to 733) and three first to third signal processors 741 to 743, respectively. The first to third input / output units 221 to 223 include a plurality of I / O modules 1_1, 1_2, ..., 1_N, 2_1, 2_2, ..., 2_N, 3_1, 3_2, ..., 3_N, respectively. .

The plant multiplexing control system according to the present invention multiplexes one electric signal input from the plant 100 in a multiplexing control system applied to a power generation and desalination plant, and transmits the electrical signal to the first to third signal processing units 741 to 743. Multiple multiplexing paths of the final electrical signals transmitted to the plant 100 with respect to the output signal data calculated by the first to third signal processing units 741 to 743, and generating electrical signals for controlling the plant 100. First of all, to improve the reliability by implementing the logic.

The first to third input / output units 721 to 723 of the present invention multiplex the structure of a path for transmitting and receiving data with the first to third communication units 731 to 733 to implement temporal synchronization of data to improve reliability. In order to improve reliability by implementing logic for generating a signal when outputting an electrical signal controlling the plant 100.

Hereinafter, each component of the plant multiplexing control system according to the present invention will be described. The first input / output unit 721, the first communication unit 731, and the first signal processing unit 741 among three input / output units, communication units, and signal processing units will be described. The other input / output unit, communication unit, and signal processing unit perform the same operation.

The input terminal unit 710 copies the signals measured by the sensors or gauges installed in the plant 100 into two or three signals according to the number of multiplexes and transfers the signals to the first to third input / output units 721 to 723, respectively. . In one example, the signal X coming from the sensor or gauge of the plant 100 is connected to the plant 100 by a hard-wire, copied to the same input signal (I_1, I_2, I_3) and again through the wire It is input to an I / O module (I / O module 1_1, I / O module 2_1 and I / O module 3_1) of the input / output unit 721. In this manner, the same process is performed on the second and third input / output units 722 and 723. Here, the input signals I_1, I_2, and I_3 that are identical to the electrical signal X may be connected to the circuit so that there is no time delay and no error.

The first input / output unit 721 receives a signal copied from the input terminal unit 710, converts an electrical signal into communication data that is digital data, and collects data of the first to third input / output units 721 to 723. The communication data is transmitted to the first communication unit 731 through corresponding communication ports (ports 1, 2 and 3) of the first communication unit 731. The first input / output unit 721 converts the electrical signal into a digital value, converts the electrical signal into digital data, and transmits the converted electrical signal to the first communication unit 731 through a serial communication line which is the communication lines C_1, C_2, and C_3. In addition, the first input / output unit 721 receives output signals transmitted through corresponding communication ports (ports 1, 2, and 3) of the first communication unit 731 through serial communication lines, and converts them into electrical output signals. To the output bottler 750. The first input / output unit 721 includes a plurality of I / O modules for simultaneously receiving a plurality of signals from the plant 100 and simultaneously outputting a plurality of signals processed by the first communication unit 731.

The first communication unit 731 is connected to the first to third input / output units 721 to 723 through a serial communication line through ports 1 to 3, and communication data transmitted from the first to third input / output units 721 to 723. The N input signal data collected from the various I / O modules are structured and transferred to the first signal processor 741 in a reliable and verified interface method such as a standard data bus (eg, VMEbus or CompactPCI). For example, port 1 of the first communication unit 731 has a control right of the I / O module 1_1 connected to the communication line C_1. In addition, port 2 of the first communication unit 731 has control of the I / O module 2_1 connected to the communication line C_2, and port 3 of the first communication unit 731 has control right of the I / O module 3_1 connected to the communication line C_3. Have

The first signal processing unit 741 processes the structured input signal data transmitted from the first communication unit 731 according to a logic operation, and outputs the processed signal to the first communication unit 731.

For example, the communication data C_1 output from the I / O module of the first input / output unit 721 is input to the first signal processing unit 741 through the communication ports 1 to 3 of the first communication unit 731. That is, the first signal processor 241 processes the input signal data C_1 input by the first communication unit 231 according to a logic operation. The signal processed by the first signal processor 241 is transmitted to the I / O module of the first input / output unit 221 again through the first communication unit 231.

The output botter 750 receives the multiplexed signals O_1, O_2, O_3 from the input / output units 721 to 723 and selects the value Y corresponding to the same two signals among the three signals according to a plurality of priority logics. Output to (100).

8 is a diagram illustrating an embodiment of fault control in the plant multiplexing control system of FIG. 7 according to the present invention.

As shown in FIG. 8, the electrical signal X coming from the sensor and the gauge of the plant 100 is connected to the input terminal portion 710 by a hard-wire and the same input signal I_1 at the input terminal portion 710. , I_2, and I_3 are copied to the input / output units 721 to 723 of each system through the electric wire. Here, the electrical signal X and the input signals (I_1, I_2, I_3) can be said to be connected to the circuit there is no time delay and error.

The first to third input / output units 721 to 723 convert the electrical signal into a digital value and convert the communication data into digital data, and the first to third communication units 731 to 733 through serial communication lines C_1, C_2, and C_3. To ports 1 to 3). That is, the first to third communication units 731 to 733 collect N input signal data through the ports 1 to 3.

In this conversion process, the electrical signal X of the plant 100 collected by the first to third communication units 731 to 733 is applied to the calculation time and the communication transmission time of the internal process of the first to third input / output units 721 to 723. Due to the delay and error, the distortion may be different from the actual signal. Here, the first to third communication units 731 to 733 always receive input signal data of two other communication lines C_2 and C_3 in addition to the communication line C_1 to which port 1 of one communication unit has a control right ( Listening), and compares the received input signal data to check the health and abnormality of the communication lines (C_1, C_2, C_3) and the I / O module.

If the data coming into the communication ports 1, 2, and 3 of the first communication unit 731 maintains a different value for a predetermined time (time delay error allowable time), it may be said that a problem occurs in the control system. Here, it is not possible to determine whether the problem is with the communication ports 1, 2, 3, the communication lines C_1, C_2, C_3, or with the I / O modules 1_1, 2_1, 3_1.

)로 표시된다. 통신포트 3(701)에 고장이 발생하여 각 통신부(731 내지 733)의 입력신호 데이터가 일정시간 이상 다를 경우에 제1 입출력부(721)의 I/O 모듈 1_1에 대한 제어권은 제2 통신부(732)가 가지게 된다. 제2 통신부(732)가 I/O 모듈 1_1의 제어권을 가진다. 이후, 각 통신부(731 내지 733)의 데이터가 동일하다면, 제2 통신부(732)는 통신부(731 내지 733)의 통신 포트 문제로 판단하게 된다. 반면, 각 통신부(731 내지 733)의 데이터가 동일하지 않으면, 제2 통신부(732)는 I/O 모듈 1_1의 고장으로 판단할 수 있다.As shown in FIG. 8, when a failure occurs in the communication port 3 701 of the first communication unit 731, the failed symbol is a failure symbol (

Is indicated by). When a failure occurs in the communication port 3 (701) and the input signal data of each communication unit 731 to 733 differs for a predetermined time or more, the control right to the I / O module 1_1 of the first input / output unit 721 is controlled by the second communication unit ( 732). The second communication unit 732 has control of the I / O module 1_1. Thereafter, if the data of the communication units 731 to 733 are the same, the second communication unit 732 determines that the communication port problem of the communication units 731 to 733 is the same. On the other hand, if the data of the communication units 731 to 733 are not the same, the second communication unit 732 may determine that the I / O module 1_1 is out of order.

9 is a diagram illustrating an embodiment of a signal flow in the plant multiplexing control system of FIG. 7 according to the present invention.

The signal measured by the sensor or gauge installed in the plant 100 is transmitted to the input terminal portion 710.

As shown in FIG. 9, three signals are copied to the first to third input / output units 721 to 723 according to the number of multiplexing of the input terminal unit 710.

Then, the first communication unit 731 receives an input signal from not only the first input / output unit 721 but also other second and third input / output units 722 and 723 through communication ports 1 to 3. As such, the first and second communication units 731 receive input signals through the communication ports 1 to 3 from all three input / output units 721 to 723.

The input signal data output from the first communication unit 731 is transmitted to the first signal processing unit 741, and the output signal data signal processed by the first signal processing unit 741 is transferred to the first communication unit 731. In this manner, the same applies to the second and third communication units 732 and 732.

FIG. 10 is a diagram illustrating an embodiment of a signal flow in the case of failure control in the plant multiplexing control system of FIG. 8 according to the present invention.

As shown in FIG. 10, a failure control will be described when an abnormality occurs in a path between the first communication unit 731 and the first signal processing unit 741.

)로 표시된다. 제1 통신부(731)와 제1 신호 처리부(741) 사이의 경로에 고장이 발생하더라도, 제2 통신부(732) 또는 제3 통신부(733)의 통신 포트 1 은 제1 입출력부(721)로부터 직렬 통신선로(C_1)를 통해 제1 입출력부(721)에서 출력된 입력신호 데이터를 수집하게 된다. 제2 통신부(732) 또는 제3 통신부(733)가 이에 대한 입력신호 데이터를 구조화하면, 각 신호 처리부(741 내지 743)는 동일한 입력신호 데이터를 기준으로 제어 로직에 대한 연산을 수행할 수 있다.If failures 1001 and 1002 occur in the path between the first communication unit 731 and the first signal processing unit 741, the failed symbol may be a failure symbol (

Is indicated by). Even if a failure occurs in the path between the first communication unit 731 and the first signal processing unit 741, the communication port 1 of the second communication unit 732 or the third communication unit 733 is serially connected from the first input / output unit 721. The input signal data output from the first input / output unit 721 is collected through the communication line C_1. When the second communication unit 732 or the third communication unit 733 structures the input signal data, the signal processing units 741 to 743 may perform operations on the control logic based on the same input signal data.

The first signal processor 741 processes the input signal data transmitted through the communication port 1 of the second communication unit 732 or the third communication unit 733, and transmits the output signal data to the first communication unit 731. Then, the output signal data from the first communication unit 731 may be finally transferred to the output vaulter 750 via the first input / output unit 721. Input signals input to the second and third input / output units 722 and 723 are finally output to the plant 100 through a transfer and signal processing process as described in FIG. 9.

Therefore, the multiplexing control system according to the present invention does not fail over the entire system regardless of the cause of the failure. Accordingly, there is an advantage that the number of input signals input from the plant 100 and the number of output signals for controlling the plant 100 are not reduced.

FIG. 11 is a detailed configuration diagram of an embodiment of the output boater of FIG. 7 according to the present invention. FIG.

As shown in FIG. 11, the output boater 750 in the plant multiplexing control system according to the present invention receives three output signals O_1, O_2, and O_3 to perform on / off operation of six output signals. A plurality of switches 1110, a plurality of multipliers 1120 for logically multiplying the output signals of different switches 1110, and a plurality of adders 1130 for performing a logical OR on the output signals of each multiplier 1120.

When the output boater unit 750 outputs a signal Y for controlling the plant 100, the output boater unit 750 receives an output signal from the first to third input / output units 721 to 723, and includes a plurality of switches 1110 and a plurality of multipliers ( An internal circuit composed of 1120 and a plurality of adders 1130 determines the output value according to a number of priorities logic. That is, the output renderer 750 receives the output signals O_1, O_2, and O_3 from the input / output units 721 to 723, and generates a logical sum of the logical products of the signals through the circuit logic shown in FIG. 11. Outputs The output signal Y of the output bottler 750 is expressed by Equation 2 below.

Here, Y is the final output signal output to the plant 100, A, B, C is the output signal transmitted from each input and output unit 721 to 723, A ', B', C 'is each input and output unit 721 To 723, a dual output signal of the output signal.

)로 표시된다. 어느 하나의 스위치(1111)에 고장이 발생하더라도 최종 출력신호 Y는 올바른 결과값으로 출력된다. 이는 플랜트(100)를 제어하는 최종 출력의 신뢰성을 높이기 위함이다. 출력 보터부(750)는 도 4에 도시된 종래의 출력 보터부(250)에 비해, 최종 출력회로의 로직을 개선하고 출력 신호에 대한 신뢰성을 향상시킨다. As shown in Equation 2, the output boater 750 supports fault-tolerance of a circuit through duplication of a switch 1110 for turning on / off an electrical signal. If a failure occurs in any one of the switches 1110, the failed symbol is a failure symbol (

Is indicated by). Even if a failure occurs in any one of the switches 1111, the final output signal Y is output with the correct result. This is to increase the reliability of the final output to control the plant 100. The output bottler 750 improves the logic of the final output circuit and improves the reliability of the output signal, compared to the conventional output bottler 250 shown in FIG. 4.

The above description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the technical spirit of the present invention. Therefore, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

The plant multiplexing control system according to the present invention improves the reliability of the plant control by not reducing the number of output signals for controlling the plant by preventing the entire operation of the control system from stopping even if any component fails. It is possible to improve the reliability of plant control by not affecting the final output value even if the internal switch of the output boat fails or malfunctions.

Claims (5)

In the plant multiplexing control system using serial communication,
An input terminal section for copying one electrical input signal input from the plant into a plurality of input signals;
An input / output unit for converting the plurality of copied input signals into a plurality of input signal data and converting output signal data output from the communication unit into a plurality of output signals;
The communication unit for collecting the converted plurality of input signal data using serial communication through a plurality of communication ports, and outputting output signal data output from a signal processing unit to the input / output unit through the plurality of communication ports;
The signal processor for signal-processing the collected plurality of input signal data and outputting output signal data; And
An output vaulter for determining one output signal among a plurality of output signals output from the input / output unit and outputting the output signal to the plant
Plant multiplexing control system comprising a.
The method of claim 1,
The communication unit,
And a plurality of converted input signal data through a plurality of serial communication lines connected in series with a plurality of communication ports corresponding to the plurality of converted input signal data.
The method of claim 2,
The communication unit,
When a failure occurs in any one of the plurality of communication ports in the path between the signal processing unit and the input / output unit, the converted plurality of input signal data are transmitted through a communication port different from the communication port where the failure occurs. Collecting plant multiplexing control system.
The method of claim 1,
The output potter part,
And multiplexing the outputted plurality of output signals and determining the output signal by performing an AND and OR operation on the plurality of duplicated output signals according to a plurality of priorities.
The method of claim 1,
The output potter part,
A plurality of switches for dualizing the plurality of output signals output from the input / output unit into first and second plurality of output signals;
A plurality of multipliers for performing logical AND operations on the duplicated first and second plurality of output signals, respectively; And
A plurality of adders for performing a logical sum operation on the output signals computed by the plurality of multipliers to determine a final output signal and outputting the determined final output signal to the plant
Plant multiplexing control system comprising a.

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