KR100277922B1 - Field data monitoring module of distributed control system - Google Patents

Abstract

The field data monitoring module of the distributed control system that monitors the site data even in the event of a central control system or communication error. The data control and I / O of the distributed control system having data control and I / O boards In the field data monitoring module for receiving field data through the O board and performing separate site data monitoring with the distributed control system, the field data monitoring module communicates the data control and the I / O board and the remote control system. A data communication unit for transmitting field data through common connection to a line, a multiplexer for multiplexing data input through the data communication unit, a CPU for receiving field data monitoring operation by receiving data input through the multiplexer, and a user on site A keypad for inputting a data output command and a first for storing field data. A second memory for storing program data related to Moriwa, field data monitoring and application operation, a liquid crystal display window for displaying field data, a liquid crystal display control unit controlling a display operation of the user's field data, and a liquid crystal display control unit at the CPU It includes a third memory for storing the field data output to the outside, and a relay for driving an external display device to notify the outside of the occurrence of field data abnormality according to the control signal of the CPU to improve the safety and reliability of the distributed control system. Can be.

Description

Field data observation module of distributed controll system

The present invention relates to a distributed control system, and more particularly, to a field data monitoring module of a distributed control system.

In general, distributed control system divides large system applied to plant into various sub-unit subsystems, enables each sub-unit system to play its own role, and enables communication between sub-unit subsystems. Output devices, controllers, user interfaces (eg, CRTs), CPUs, workstations and communications networks.

Hereinafter, the field data monitoring module of the distributed control system according to the related art will be described.

1 is a block diagram illustrating a distributed control system according to the related art.

The distributed control system according to the prior art is a data control and I / O board 11, the data control for converting the field data, that is, analog data such as temperature, pressure, water level, etc. into digital data and performing input / output operations And a remote control system 21 and a remote control system 21 for converting the digital data input through the I / O board 11 into industrial data and transferring the digital data to the upper system, that is, the central control system 31, through a communication medium. It is composed of a central control system 31 to grasp the state of the field, that is, the operating state of the motor, valves, etc. according to the data transmitted from the system and to generate an alarm or the like in the event of a dangerous situation due to abnormal operation or overload.

At this time, the remote control system 21 is an industrial communication medium 24 such as RS-485 22, CPU 23, and Mini Map, which is a communication protocol for performing data control and communication with the I / O board 11. It is composed.

In addition, the central control system 31 is an industrial communication medium 32 for performing data communication with the remote control system 21, the CPU 33, the monitor 34 for displaying the operation status of the field so that the user can see It consists of a console desk 35 for inputting an operation signal and an Ethernet 36 which is a communication medium.

The operation of the field data monitoring module configured as described above is as follows.

On-site data, that is, analog signals such as temperature, pressure, water level, etc. are converted into digital data through data control and I / O board 11 and converted into industrial data in the remote control system 21 so that the industrial communication medium 24 It is transmitted to the central control system 31 through.

Subsequently, the central control system 31 displays the transmitted data through the monitor 34 so that the administrator can easily grasp the status of the site, so that the administrator can grasp the status of the site through the monitor 34 and a dangerous situation occurs. Appropriate measures are to be taken, such as stopping the operation of machinery on site and generating an alarm.

The distributed control system according to the prior art monitors the site without grasping the site situation in case of failure of the upper system, that is, the central control system, failure of the data processing part, or communication error between the upper system and the lower system, that is, the remote control system. There is an impossible problem.

Accordingly, an object of the present invention is to provide a field data monitoring module of a distributed control system capable of monitoring field data even in the event of a central control system or communication failure.

Explanation of symbols for main parts of the drawings

The present invention receives field data through a data control and I / O board of a distributed control system having a central control system, a remote control system, a data control and an I / O board, and monitors site data separate from the distributed control system. In the field data monitoring module for performing, the field data monitoring module is commonly connected to the data control and communication line connecting the I / O board and the remote control system, and is input through the data communication unit and the data communication unit for transmitting field data. A multiplexer for multiplexing data, a CPU for performing field data monitoring by receiving data input through the multiplexer, a keypad for inputting a field data output command by a user, a first memory for storing field data, The second memory for storing program data related to field monitoring and application operation, and A liquid crystal display window for displaying, a liquid crystal display controller for controlling the display operation of the liquid crystal display window according to the control signal and the field data output from the CPU according to the user's field data output command, and the field data output from the CPU to the liquid crystal display controller And a third memory for storing and an external display device driving relay for notifying outside of field data abnormality according to a control signal of a CPU.

Hereinafter, the field data monitoring module of the distributed control system according to the present invention will be described with reference to the accompanying drawings.

Figure 2 is a block diagram showing a distributed control system according to the present invention, Figure 3 is a block diagram showing the configuration of the field data monitoring module of FIG.

First, since the present invention is the same as the configuration of the prior art except for the field data monitoring module, the description of the same configuration will be omitted and the same reference numerals will be given.

As shown in FIG. 2, the distributed control system according to the present invention includes a data control and I / O board 11, a remote control system 21, a central control system 31 and the data control and I / O board 11. ) And the field data monitoring module 41 connected to the communication line of the remote control system 21 through LN1 to LN4 in common.

At this time, the field data monitoring module 41 multiplexes the field data inputted through the LN1 (47), LN2 (48), LN3 (49), LN4 (50), and RS-232 (51) 46 and communication ports. CPU 42 for inputting the signal through 43 to monitor the situation of the site, a reset unit 44 for resetting the CPU 42, and a clock generator for providing an operation clock of the CPU 42 ( 45), a keypad 52 for inputting a signal for the user to grasp the site information, an application S / W ROM 53 in which a program for on-site data monitoring and application functions is stored, and a ROM storing data on the field data history. 54 and the RAM 55, the liquid crystal display controller 56 for controlling the liquid crystal display window 58 according to the control signal of the CPU 42, the RAM 57 for storing the display window control data and the alarm situation generator It is composed of a relay 59 for driving an external indicator (not shown) for displaying this according to the output condition.

At this time, the RS-232 (51) is an additional port for performing communication with a general personal computer (PC).

The operation of the field data monitoring module configured as described above is as follows.

First, by interrupt processing so that the data necessary for the field data monitoring operation of the central control system 31 is not damaged on the communication line where the field data is transmitted from the data control and I / O board 11 to the remote control system 21. LN1 (47), LN2 (48), LN3 (49), LN4 (50) and multiplexer (46) and communication port (43) are input to the CPU 42.

At this time, the field data is divided into analog data and digital data. First, analog data is data such as pressure, flow rate, water level, temperature, etc. of the plant, which can specify the state of the entire plant and is an important factor involved in the safety of the plant. Upper and lower limits are set and operated.

The following digital data is a relay circuit that allows the status of a plurality of motors or valves in the field to be known, and control is performed to designate the operation status of the valve or motor in case of emergency.

Subsequently, the data input to the CPU 42 is stored in the corresponding RAM 55 areas of the LN1 47, LN2 48, LN3 49, and LN4 50, respectively.

In addition, when the user inputs a specific field data output command through the keypad 52 to determine the state of the field through the field data, the CPU 42 drives the corresponding RAM to read data.

Subsequently, the CPU 42 applies a control signal to the liquid crystal display controller 56 and simultaneously transmits the corresponding data.

The data is stored in the RAM 57 connected to the liquid crystal display controller 56, and the liquid crystal display controller 56 displays on-site data required by the user through the liquid crystal display 58 according to a control signal of the CPU 42. do.

In addition, when the user inputs the field data setting value through the keypad 52, the CPU 42 stores the setting value in the application S / W ROM 53.

Therefore, the CPU 42 monitors the field data and displays a drive signal through the internal alarm device, that is, the buzzer or the LED when it is out of the preset value range set by the user or the relay 59 according to the output condition preset by the user. It is displayed through an external display device connected to the relay 59 by applying.

In addition, the field data monitoring module 41 of the present invention can communicate with an external PC through the RS-232 (51) as needed.

As described above, the field data monitoring module 41 of the present invention performs the field data monitoring operation separately from the central control system 31.

Since the field data monitoring module of the distributed control system according to the present invention can perform the site data monitoring operation separately from the central control system, even if an operation error of the central control system or the communication line occurs, it is possible to grasp the state of the site and to identify a dangerous situation. It is possible to prepare for the occurrence, thereby improving the safety and reliability of the entire distributed control system.

Claims (2)

(Correct) On-site data is input through data control and I / O board of central control system, remote control system, data control and distributed control system with I / O board, and separate monitoring of site data with the distributed control system In the field data monitoring module for performing, The field data monitoring module includes a data communication unit for common connection to the data control and communication line connecting the I / O board and the remote control system to transmit field data; A multiplexer for multiplexing data input through the data communication unit; A CPU which receives data input through the multiplexer and performs a field data monitoring operation; A keypad for a user to input a field data output command; A first memory for storing field data; A second memory for storing on-site data monitoring and application operation related programs; A liquid crystal display window for displaying field data; A liquid crystal display control unit controlling a display operation of the liquid crystal display according to the field data and a control signal output from the CPU according to a user's field data output command; A third memory for storing site data output from the CPU to a liquid crystal display window controller; On-site data monitoring module of a distributed control system comprising a relay for driving an external display device for informing the outside of the occurrence of on-site data abnormality according to the control signal of the CPU. The method of claim 1, And the data communication unit further comprises an RS-232 port for performing communication with an external PC.