KR102681978B1 - Water supply and sewage facility control system automatic operation recovery apparatus - Google Patents

Abstract

The present invention is a sequence emergency operation device that automatically operates major components such as pumps when a general-purpose controller that operates water and sewage facilities becomes inoperable due to external factors such as lightning or lightning or encounters a situation in which remote control is not possible. It relates to an automatic operation recovery device of a water supply and sewerage facility control system that operates to prevent accidents such as water outage or backflow of sewage in the water supply area. It is installed in the instrumentation control device that controls water supply and sewerage facilities, and control commands are received remotely. a programmable logic controller that sequentially performs logical processing through a program to control the operation of the mechanical devices constituting the water supply and sewerage facilities; A PLC monitoring unit that monitors whether the programmable logic controller is inoperable; a sequence emergency activating device for emergency activating at least one priority operation mechanism among the mechanisms; an operation mode switching unit that selectively switches between a normal operation mode connecting the control output of the programmable logic controller to the priority operation mechanism and an emergency operation mode connecting the control output of the sequence emergency operation device to the priority operation mechanism; And when the PLC monitoring unit detects the inoperability of the programmable logic controller, the operation mode switching unit is operated in the emergency operation mode, and when the programmable logic controller is converted from an inoperable state to a normal operation state, the operation mode switching unit is operated in the emergency operation mode. It includes a microcontroller that controls operation in normal operation mode.

Description

Water supply and sewerage facility control system automatic operation recovery device {WATER SUPPLY AND SEWAGE FACILITY CONTROL SYSTEM AUTOMATIC OPERATION RECOVERY APPARATUS}

The present invention operates a sequence emergency operation device that automatically operates major components such as pumps when a general-purpose controller that operates water and sewage facilities becomes inoperable due to external factors such as lightning or lightning or encounters a situation in which remote control is not possible. This relates to an automatic operation recovery device for a water supply and sewerage facility control system that prevents accidents such as water outage or backflow of sewage in the water supply area.

In general, treated water such as raw water or influent is stored in water purification plants that purify raw water supplied from a water source and discharge it into the water supply, or in sewage treatment plants that remove harmful substances or pollutants from influent water such as factory wastewater or sewage. A water treatment system is installed to process, transport, and purify water. The water treatment system is equipped with mechanical devices such as pumps, valves, compressors, motors, and measuring instruments to treat raw water or influent water.

Water treatment systems in small facilities, such as on the outskirts of urban areas, are typically automatically controlled by an instrument control unit installed in an on-site control panel. Instrumentation control devices include general-purpose controllers such as programmable logic controllers (PLCs). PLC controls the operation of pumps, valves, compressors, motors, and measuring instruments installed in water supply and sewerage facilities. At this time, since it is difficult for a manager to work on a regular basis in a small-scale water treatment system, the control operation of the PLC is controlled by a remote controller.

The remote controller transmits control commands through a communication network, and the PLC in the field control panel controls mechanical devices according to the control commands of the remote controller, and senses data detected from sensing devices such as water level gauges, flow gauges, water quality gauges, pressure gauges, and thermometers. transmit remotely. The database server provided in the remote controller stores and manages control data and sensing data for a plurality of water supply and sewerage facilities included in the control target.

However, the phenomenon of PLC becoming inoperable due to external factors such as lightning often occurs. When the power supplied to the PLC is momentarily cut off by lightning, an error occurs in the PLC, communication with the remote controller is lost, and the operation of the water treatment system is temporarily halted. Afterwards, the power recovery device operates and the power is re-applied, canceling the trip of the PLC. However, if the communication connection with the remote controller remains disconnected, the water supply to the water supply may be stopped for a considerable period of time or the treatment of wastewater may become impossible.

If a manager is stationed on site, he or she can quickly respond to a PLC malfunction and get the water treatment system back into normal operation. However, in most water treatment systems outside of urban areas, the system is operating without a manager, so the dispatch of repair personnel is delayed, resulting in recovery. There is a problem that takes a lot of time to complete.

Republic of Korea Patent Publication No. 10-2002-0032787

The present invention monitors in real time whether the general-purpose controller that operates the water treatment system is inoperable due to external factors such as lightning, and immediately operates the sequence emergency operation device when the general-purpose controller is inoperable to prevent heavy components such as pumps. The purpose is to provide an automatic operation recovery device for a water supply and sewerage facility control system that can prevent accidents such as water outage or backflow of sewage in the water supply area in water supply and sewage facilities in areas outside the city center where managers are not present by automatically operating the devices.

The automatic operation recovery device for the water supply and sewerage facility control system according to an embodiment of the present invention is installed in an instrumentation control device that controls the water supply and sewerage facility, and configures the water supply and sewerage facility by sequentially logically processing control commands received remotely by a program. Programmable logic controller that controls the operation of mechanical devices; A PLC monitoring unit that monitors whether the programmable logic controller is inoperable; a sequence emergency activating device for emergency activating at least one priority operation mechanism among the mechanisms; an operation mode switching unit that selectively switches between a normal operation mode connecting the control output of the programmable logic controller to the priority operation mechanism and an emergency operation mode connecting the control output of the sequence emergency operation device to the priority operation mechanism; And when the PLC monitoring unit detects the inoperability of the programmable logic controller, the operation mode switching unit is operated in the emergency operation mode, and when the programmable logic controller is converted from an inoperable state to a normal operation state, the operation mode switching unit is operated in the emergency operation mode. It includes a microcontroller that controls operation in normal operation mode.

An automatic operation recovery device for a water and sewerage facility control system according to another embodiment of the present invention includes the PLC monitoring unit, a frequency generator that generates a predetermined detection frequency using a register inside the programmable logic controller; a solid-state relay that outputs a switching signal in a non-contact manner according to the output of the frequency generator; and a frequency check unit that detects whether a switching signal corresponding to the detection frequency is generated from the solid state relay.

In the automatic operation recovery device for water supply and sewerage facility control system according to another embodiment of the present invention, the detection frequency is 1Hz.

In the automatic operation recovery device for water and sewerage facility control system according to another embodiment of the present invention, the priority operating mechanism is a pump.

In the automatic operation recovery device for the water and sewerage facility control system according to another embodiment of the present invention, the microcontroller generates a warning signal notifying the occurrence of an error in the programmable logic controller when the operation time of the emergency operation mode exceeds a predetermined time. and transmits it to a remote control server.

According to the automatic operation recovery device for the water and sewerage facility control system of the present invention, it monitors in real time whether the general-purpose controller that operates the water treatment system is inoperable due to external factors such as lightning, and when the general-purpose controller is inoperable, an emergency sequence is activated. By immediately operating the operating device and automatically operating heavy components such as pumps, it is effective in preventing accidents such as water outage or backflow of sewage in the water supply area in water supply and sewerage facilities in areas outside the city center where managers are not present.

1 is a block diagram illustrating a general water supply and sewerage facility control system;
Figure 2 is a block diagram illustrating an automatic operation recovery device for water and sewerage facility control system according to the present invention;
Figure 3 is a block diagram illustrating the configuration of the PLC monitoring unit in the present invention, and
Figure 4 is a flow chart illustrating a process in which a microcontroller executes automatic operation recovery in the present invention.

Hereinafter, specific embodiments according to the present invention will be described with reference to the attached drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Throughout the specification, parts having similar structures and operations are given the same reference numerals. Additionally, the drawings attached to the present invention are for convenience of explanation, and the shape and relative scale may be exaggerated or omitted.

In describing the embodiments in detail, redundant descriptions or descriptions of techniques that are obvious in the field have been omitted. Additionally, in the following description, when a part is said to “include” other components, this means that it may include additional components in addition to the components described, unless specifically stated to the contrary.

In addition, terms such as "unit", "unit", and "module" used in the specification refer to a unit that processes at least one function or operation, which may be implemented through hardware or software or a combination of hardware and software. You can. Additionally, when a part is said to be electrically connected to another part, this includes not only the case where it is directly connected, but also the case where it is connected with another component in between.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, the second component may be referred to as the first component without departing from the scope of the present invention, and similarly, the first component may also be referred to as the second component.

Before explaining the automatic operation recovery device for the water and sewage facility control system according to the present invention, a general water and sewage facility control system will first be described.

Figure 1 is a block diagram illustrating a general water supply and sewerage facility control system. Referring to FIG. 1, the water and sewerage facility control system consists of a remote control system 100, an instrumentation control device 200 in an on-site control panel, and a water treatment system 300 installed in the water and sewerage facility.

The remote control system 100 is for controlling locally located water supply and sewerage facilities from a remotely located server device and monitoring the current operating status, and includes a database server 110, a monitoring unit 120, and a control command transmitter 130. It consists of

The database server 110 stores and manages status data collected from the water treatment system of the water supply and sewerage facility. For example, the remote control system 100 is in the normal operating state or abnormality of the mechanical devices of the water treatment system 300, such as the pump 310, valve 320, compressor 330, motor 340, and instrument 350. When sensing data related to the operating state is collected, the sensing data is stored and managed along with the identification data of the water treatment system.

The monitoring unit 120 monitors the status of the water and sewerage facility control system in real time. For example, the monitoring unit 120 outputs the collected sensing data along with graphics and text representing water supply and sewerage facilities on a large display, allowing the manager of the control room to check the status of the facilities in real time. In addition, the monitoring unit 120 compares the sensing data with pre-stored threshold values to check whether there is an abnormality in the water supply and sewerage facility control system, and when an abnormality occurs, it sends out a message indicating the need for control so that immediate action can be taken.

The control command transmitter 130 transmits an operation control command of the water treatment system 300 to the instrumentation control device 200 of the field control panel. For example, according to the results confirmed by the manager of the control room through the monitoring unit 120, the pump 310, valve 320, compressor 330, motor 340, instrument 350, etc. of the water treatment system 300 The operation command can be transmitted to the instrumentation control device 200. As another example, the control command transmitter 130 may automatically transmit a pre-programmed control command according to the monitoring results of the monitoring unit 120.

The instrumentation control device 200 includes a communication unit 210, a power control/recovery device 220, a sensing device 230, and a programmable logic controller (PLC) 240.

The communication unit 210 receives control commands for the water treatment system 300 from the remote control system 100 and transmits sensing data detected by the sensing device 230 to the remote control system 100. For example, the communication unit 210 is a communication means consisting of one of an RS-485 serial communication module, a power line communication module, an Ethernet communication module, and a wireless communication module, or a combination of these modules.

The power control/recovery device 220 is a device that supplies power to components installed in the instrumentation control device and trips a relay or re-applies power when an overcurrent or abnormal current occurs. The sensing device 230 is a means for detecting the operating state of the water treatment system 300 and may include, for example, a water level gauge, a flow meter, a water quality gauge, a pressure gauge, and a thermometer.

The PLC 240 is a means of controlling mechanical devices such as the pump 310, valve 320, compressor 330, motor 340, and instrument 350 of the water treatment system 300. The PLC 240 sequentially logically processes control commands received from the remote control system 100 using a program and controls the mechanical devices of the water treatment system 300 using the output results. For example, the PLC 240 is programmed and operated by a ladder diagram composed of functional blocks having a-contact switches, b-contact switches, timers, logical operation instructions, communication, and various other functions.

At this time, the automatic operation recovery device for the water and sewerage facility control system of the present invention further includes an automatic operation recovery device 500 in addition to the instrumentation control device 200. The automatic operation recovery device 500 according to the present invention will be described in detail with reference to FIGS. 2 to 4.

Figure 2 is a block diagram illustrating the automatic operation recovery device for the water and sewerage facility control system according to the present invention, Figure 3 is a block diagram illustrating the configuration of the PLC monitoring unit in the present invention, and Figure 4 is a microcontroller in the present invention for automatic operation. This is a flowchart illustrating the process of executing recovery.

Referring to FIG. 2, the automatic operation recovery device 500 includes a PLC monitoring unit 510, a microcontroller 520, a sequence emergency operation device 530, and an operation mode switching unit 540.

The PLC monitoring unit 510 monitors whether the PLC 240 is inoperable. Referring to FIG. 3, the PLC monitoring unit 510 consists of a frequency generator 512, a solid state relay (SSR) 514, and a frequency check unit 516.

The frequency generator 512 generates a predetermined detection frequency using a register inside the PLC 240. For example, the detection frequency is 1Hz. When the PLC 240 operates normally, a detection frequency of 1 Hz is generated, and when the PLC 240 is inoperable, the registers inside the PLC also do not operate, so the detection frequency will not be generated.

The SSR 514 outputs a switching signal in a non-contact manner according to the output of the frequency generator 512. Whenever the output of the frequency generator 512 is generated, the SSR 514 operates an internal photo coupler and outputs a switching signal through an insulated output terminal. As is commonly known, SSR has a fast operating speed and does not mechanically open or close contacts, so it can stably output repetitive switching signals. In addition, since the input and output terminals are insulated, the inoperable state of the PLC (240) can be detected quickly and stably.

The frequency check unit 516 detects whether a switching signal corresponding to the detection frequency is generated in the SSR 514. The frequency check unit 516 may include a counter, continuously count the number of times the detection frequency is not confirmed, and output a PLC error signal when the detection frequency is not detected five times in a row. The microcontroller 520 recognizes whether the PLC 240 is in a normal operating state or an inoperable state according to the detection result of the frequency check unit 516.

The sequence emergency operation device 530 first activates at least one of the mechanical devices such as the pump 310, valve 320, compressor 330, motor 340, and instrument 350 that constitute the water treatment system 300. It is a device for emergency operation of operating machinery. For example, the priority operating mechanism is the pump 310, which must be operated essentially for water supply or wastewater treatment in water supply and sewerage facilities.

Referring to FIG. 3, the operation mode switching unit 540 operates in a normal operation mode that connects the control output of the PLC 240 to the priority operation mechanism of the water treatment system 300, and the control output of the sequence emergency operation device 530. Selectively switches to emergency operation mode, which connects to the operating mechanism first.

Referring to the flowchart of FIG. 4, the microcontroller 520 monitors whether the PLC 240 is inoperable from the output of the PLC monitoring unit 510 (ST110). If it is detected in step ST120 that the PLC 240 is in an inoperable state, the sequence emergency operation device 530 is turned ON (ST130). At this time, the operation mode switching unit 540 is switched to the emergency operation mode according to sequential logic processing of the ladder diagram constituting the sequence emergency operation device 530. And, despite the inability of the PLC 240, the operation of the priority mechanical devices is automatically restored. Therefore, priority operating mechanisms such as pump 310 can continue to operate under any circumstances.

After a predetermined time delay (eg, 5 minutes) step (ST140), the microcontroller 520 determines whether the PLC 240 is converted from an inoperable state to a normal operating state (ST150).

If it is determined as 'No' in step ST150, a warning signal notifying that an error has occurred in the PLC 240 is generated and transmitted to the remote control server (ST160). Even in the process of executing response measures such as dispatching repair personnel from the control server, accidents such as water outage or sewage backflow in the water supply area can be prevented by the sequence emergency operation device 530.

If it is determined as 'Yes' in step ST150, the sequence emergency operation device 530 is turned OFF (ST170). According to the logic processing of the ladder diagram constituting the sequence emergency operation device 530, the operation mode switching unit 540 is converted back to the normal operation mode. And the mechanical devices of the water treatment system 300 are controlled to operate normally under the control of the PLC 240.

The invention disclosed above can be modified in various ways without damaging the basic idea. In other words, all of the above embodiments should be interpreted as illustrative and not limited. Therefore, the scope of protection of the present invention should be determined based on the attached claims, not the above-described embodiments, and if the components defined in the attached claims are replaced with equivalents, this should be considered to fall within the scope of protection of the present invention.

100: remote control system 110: database server
120: monitoring unit 130: control command transmitting unit
200: Instrumentation control device 210: Communication department
220: Power control/recovery device 230: Sensing device
240: Programmable logic controller (PLC)
300: water treatment system 310: pump
320: valve 330: compressor
340: motor 350: measuring instrument
500: Automatic operation recovery device 510: PLC monitoring unit
512: Frequency generator 514: Solid state relay (SSR)
516: Frequency check unit 520: Microcontroller
530: Sequence emergency operation device 540: Operation mode conversion unit

Claims (5)

A programmable logic controller installed in an instrumentation control device that controls water supply and sewerage facilities, and controlling the operation of the mechanical devices constituting the water supply and sewerage facilities by sequentially logically processing remotely received control commands through a program;
A frequency generator that generates a predetermined detection frequency using a register inside the programmable logic controller, a solid-state relay that outputs a switching signal in a non-contact manner according to the output of the frequency generator, and the detection in the solid-state relay. A frequency check unit detects whether a switching signal corresponding to the frequency is generated, counts the number of times the detected frequency is not confirmed, and outputs a PLC error signal indicating inoperability of the programmable logic controller when a predetermined count is reached. PLC monitoring unit;
a sequence emergency activating device for emergency activating at least one priority operating mechanism among the mechanisms;
an operation mode switching unit that selectively switches between a normal operation mode connecting the control output of the programmable logic controller to the priority operation mechanism and an emergency operation mode connecting the control output of the sequence emergency operation device to the priority operation mechanism; and
When the PLC monitoring unit detects the inoperability of the programmable logic controller, the operation mode switching unit is operated in the emergency operation mode, and when the programmable logic controller is converted from the inoperable state to the normal operation state, the operation mode switching unit is operated in the normal operation mode. Microcontroller that controls operation in driving mode
Water supply and sewerage facility control system including automatic operation recovery device.
delete According to paragraph 1,
Automatic operation recovery device for water supply and sewerage facility control system where the detection frequency is 1Hz.
According to claim 1 or 3,
The priority operating mechanism is a water and sewage facility control system automatic operation recovery device that is a pump.
According to paragraph 1,
The microcontroller generates a warning signal notifying the occurrence of an error in the programmable logic controller when the operation time of the emergency operation mode exceeds a predetermined time and transmits it to a remote control server. Automatic operation recovery device for water supply and sewerage facility control system.

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