JP2015219616A - Monitoring control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain increase in the capacity of a network and apparatuses and the upgrade of a function more than necessary by reducing the amount of communication data between a controller and an upper-level data processing device.SOLUTION: A monitoring control system transmits plant apparatus state data collected by a controller 40 to a data server 60, and monitors and controls a plant apparatus 10 on the basis of reception data in response to it. The controller 40 comprises a control unit 42 that performs constant cycle processing of the plant apparatus state data per execution unit time, generates time counter synchronization information 44T comprising reference time information and a reference time counter, and time counter-added plant apparatus state data 44D in which a time counter incremented per execution unit time is added to the plant apparatus state data, and stores them in a buffer memory 45. The control unit 42 transmits the synchronous information 44T and the state data 44D to the data server 60.

Description

  The present invention relates to a monitoring control system in which means for acquiring time information indicating the collection time of state data of various plant devices is improved.

In general, in large-scale plants such as power plants, industrial plants, and water treatment plants, there are a wide variety of plant devices to be monitored and controlled, such as electric motors, valves, circuit breakers, switches, pumps, air conditioners, etc. The state data acquired from these plant devices as the analog output of the measuring instrument also varies widely, such as the operating state, temperature, current, voltage, vibration, pressure, and the like.
For this reason, the total number of points to be monitored and controlled may reach several hundreds depending on the scale of the plant.

An HMI (Human Machine Interface) device with a display device is known as a monitoring and control device in this type of large-scale plant.
Usually, the HMI device is installed on the monitoring station side remote from the plant equipment, and the controller for controlling each plant equipment is installed in a control equipment room equipped with air conditioning several tens of meters away from each plant equipment. In the vicinity of each plant device, remote I / O devices that digitally output analog outputs of various measuring instruments installed in each device to some extent are provided, and a corresponding controller is provided from a plurality of remote I / O devices. Toward, tens of types of state data (hereinafter also referred to as plant equipment state data) of the corresponding plant equipment are transmitted. These controllers and the HMI device are connected by a network.

In such a large-scale plant, since there are many transmission paths from each plant device to the HMI device on the monitoring station side, the plant device state increases as the number of plant devices, in other words, the plant size increases. Data transmission delay is large and often occurs.
For this reason, the status data currently being monitored, which is given a time stamp on the monitoring station side, is actually status data collected a certain time ago, and if monitoring control is performed based on the status data, the status of the plant equipment is changed. There is a risk of misjudgment or issuing an incorrect control command.

As a prior art for solving the transmission delay of the plant equipment state data as described above, a plant monitoring control system described in Patent Document 1 is known.
FIG. 4 is a configuration diagram of the plant monitoring control system, where 100 is a plant device, 200 is a data input card including a data input unit 210, a time setting unit 220, and a time management unit 230, and 300 is a plant device side transmission line. , 400 is a controller including an I / O communication control unit 410, a monitoring control network control unit 420, a state change detection unit 430 and a buffer memory 440, 500 is a monitoring control network, 600 is a search unit 610 and a storage unit 620. A data server 700 is a display device.

In the prior art shown in FIG. 4, the time setting unit 220 and the time management unit 230 are provided in the data input card 200 close to the plant equipment 100 that is the generation source of the state data, and these functions are used as shown in FIG. The plant equipment state data 240 with time information is created. The plant equipment state data 240 is obtained by adding time information T _{1 to} T _n indicating the collection time of each data to the plant equipment state data D _{1 to} D _n .
Then, the plant equipment state data 240 with time information is converted into a data structure in the form of the number of pieces to be transmitted, and transmitted to the data server 600 via the plant equipment side transmission path 300, the controller 400, and the monitoring control network 500. Are stored in the storage unit 620.

  That is, in this prior art, since the time setting unit 220 and the time management unit 230 in the data input card 200 in the immediate vicinity of the plant device 100 perform time information assignment and management, the plant device 100 received by the data server 600 is received. The time information of the state data almost coincides with the actual data collection time, and the operator can perform monitoring control with high accuracy using the plant equipment state data that is less affected by transmission delay.

Japanese Unexamined Patent Publication No. 2004-199624 (paragraphs [0011] to [0030], FIG. 1, FIG. 7, etc.)

However, according to the data structure shown in FIG. 5, the amount of data transmitted from the data input card 200 side to the data server 600 side in one operation is (data size of time information + data size of plant equipment state data). X (the number of plant equipment state data 240 with time information), and there was a problem that the amount of communication data increased compared to the case of transmitting only the plant equipment state data.
As the amount of communication data increases in this way, the capacity of the plant equipment side transmission path 300 and the monitoring control network 500 and the transmission / reception load in the controller 400, the data server 600, etc. also increase. As a result, the cost was increased.

  Therefore, the problem to be solved by the present invention is to reduce the amount of data communicated between the controller and the host data processing device such as the data server, thereby suppressing the increase in capacity of the network and each device and the enhancement of the functions more than necessary. An object of the present invention is to provide such a monitoring control system.

In order to solve the above problems, the invention according to claim 1 is directed to transmitting plant equipment state data collected from a plant device by a controller to a higher-level data processing device via a network, and the data processing device is configured to transmit the plant equipment state. In a monitoring control system for monitoring and controlling the plant equipment based on data,
The controller is
A time management unit for managing the reference time information;
An internal time counter, periodically processing the plant equipment state data for each execution unit time, time counter synchronization information including the reference time information and a reference time counter corresponding to the reference time information, and A control unit for generating plant equipment state data with a time counter in which the time counter incremented every execution unit time is added to the plant equipment state data;
A memory for storing the time counter synchronization information generated by the control unit and the plant equipment state data with the time counter,
The control unit reads out the time counter synchronization information and the plant equipment state data with the time counter from the memory and transmits them to the data processing device.

  The monitoring control system according to claim 2 is the monitoring control system according to claim 1, wherein the data processing device is a difference between a time counter included in the plant equipment state data with the time counter and the reference time counter, Using the execution unit time and the reference time information, the time when the plant equipment state data is collected by the controller is calculated.

  According to a third aspect of the present invention, in the monitoring control system according to the first or second aspect, the time management unit acquires the reference time information from an external time server or the like via the network.

  According to the present invention, it is no longer necessary to add time information to the plant equipment status data transmitted from the controller to the host data processing device, and the communication data amount is reduced as compared with the prior art to increase the capacity of the network and each equipment. It is possible to suppress the above high functionality and contribute to the cost reduction of the entire system.

It is a block diagram which shows embodiment of this invention. It is a conceptual diagram which shows operation | movement of the control part in embodiment of this invention. It is a figure which shows the data structure of the time counter synchronous information and plant equipment state data with a time counter in embodiment of this invention. It is a block diagram of the prior art described in patent document 1. FIG. It is explanatory drawing of the plant equipment state data with time information in a prior art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a monitoring control system according to this embodiment. In FIG. 1, a plurality of plant devices 10 to be monitored and controlled are an electric motor, a valve, a circuit breaker, a switch, a pump, an air conditioner, and the like. Each plant device 10 is provided with various measuring instruments (not shown) for measuring the operating state, temperature, current, voltage, vibration, pressure, etc. Analog plant equipment state data acquired by these measuring instruments. Is transmitted to the I / O device 20.
Here, the plant equipment 10 is installed near the I / O device 20, and the time when the I / O device 20 collects data from the plant equipment 10 is almost the same as the collection time of the plant equipment state data in the plant equipment 10. It shall be equal.

The I / O device 20 converts a large number of plant equipment state data into digital data of a predetermined format and transmits it to the controller 40 via the I / O network 30. The controller 40 receives plant equipment state data through the I / O network communication unit 41.
The control unit 42 functions to control the I / O network communication unit 41, the control network communication unit 43, the time management unit 44, and the buffer memory 45, and reads out the plant equipment state data from the buffer memory 45 to control the control network communication unit 43 and In addition to having a function of transmitting to the data server 4 via the control network 50, various commands are transmitted to the I / O device 20 via the I / O network communication unit 41 when performing control operations on the plant equipment 10. It also has functions.

The time management unit 44 can communicate with the time server 70 via the control network communication unit 43 and the control network 50, and cooperates with the control unit 42 according to the reference time sent from the time server 70. A time counter and the like to be described later are managed.
The control network communication unit 43 transmits the plant equipment state data sent from the control unit 42 to the data server 60 via the control network 50.
The data server 60 receives the plant equipment state data sent from the controller 40 via the control network 50, saves it in the storage unit 61, and uses it for monitoring and controlling the plant equipment 10.
The time server 70 periodically communicates time information with a plurality of controllers 40 to maintain time synchronization between the controllers 40.

  FIG. 2 is a conceptual diagram showing the operation of the control unit 42 in the controller 40, and the control unit 42 performs input → calculation → output as one execution unit time for the plant equipment state data transmitted from the plant equipment 10. As the processing of (cycle) P, this processing is repeatedly executed at regular intervals.

The operation of this embodiment will be described below with reference to FIG.
The control unit 42 is configured to increment a time counter (time count value) held therein every time the process of the execution unit time P is repeated. Here, it is assumed that the data size of the time counter is smaller than the data size of time information (information consisting of year / month / day / hour / minute / second).

First, the control unit 42 pairs the time information T _x received by the time management unit 44 from the time server 70 and the time counter C _x at that time into the buffer memory 45 as time counter synchronization information 44T in FIG. save. Here, the time information T _x corresponds to the reference time information in the claims, the time counter C _x corresponds to the reference time counter in the claims.
The control unit 42 increments the time counter each time the plant equipment state data received from the plant equipment 10 at a certain address is processed with the execution unit time P in FIG. Are stored in the buffer memory 45 as plant equipment state data 44D with a time counter in FIG. The address of the plant device 10 is included in the plant device state data 44D with a time counter.

FIG. 3 shows a state in which one plant device 10 collects plant device state data D _{1 to} D _n in time series, and time counters C _{1 to} C _n corresponding thereto are added to the respective state data. The data structure is shown.
Since a plurality of plant devices 10 are normally connected to the I / O device 20 installed in one-to-one correspondence with the controller 40, the time counter synchronization of the structure shown in FIG. Information 44T and plant equipment state data with time counter 44D are stored in the buffer memory 45.

Next, when the plant equipment state data stored in the buffer memory 45 is read by a command from the control unit 42 or the data server 60, the time counter synchronization information 44T and the requested number of plant equipment states with time counters are requested. Data 44D is simultaneously read and sent to the control network communication unit 43.
These data are sent to the data server 60 via the control network 50 and stored in the storage unit 61.

Based on the time counter synchronization information 44T, the time counters C _{1 to} C _n in the plant equipment state data 44D with time counter, and the execution unit time P, the data server 60 performs the plant equipment state data D ₁ as follows. to get the collection time of ~D _n.
For example, the time counter of the time counter synchronization information 44T received by the data server 60 is C _x , the time information is also T _x, and the time counter corresponding to the plant equipment state data D ₁ of the plant equipment state data 44D with a certain time counter is Assuming C ₁ , the time T ₁ when the plant equipment state data D ₁ is actually collected by the controller 40 (substantially equal to the data collection time by the plant equipment 10) T ₁ is obtained by the following Equation 1.
[Formula 1]
T ₁ = T _x + (C ₁ −C _x ) × P

  That is, according to this embodiment, in the controller 40, a time counter having a data size smaller than the time information is added to each plant equipment state data and transmitted to the data server 60, and the data server 60 performs the calculation of Equation 1. By doing, the time when the plant equipment state data was collected by the controller 40 can be acquired. Therefore, the amount of communication data can be greatly reduced as compared with the conventional case where time information is added to individual plant equipment state data and transmitted to a host server.

For example, when the data size of the time information is L _t , the data size of the time counter is L _c , and the number of plant equipment state data with time information communicated simultaneously is n, according to the present embodiment, FIG. Compared with the prior art shown in FIG. 5, the amount of data shown in Formula 2 is reduced. In Equation 2, L _t > L _c .
[Formula 2]
(L _t −L _c ) × n− (L _t + L _c )

  Therefore, according to the present embodiment, the capacity of each network 30, 50 or buffer memory 45 and the amount of data processed by each communication unit 41, 43 can be reduced. This can contribute to cost reduction.

  The present invention can be used in various monitoring control systems that require a reduction in the amount of communication data when performing various types of plant equipment state data to a host server or the like to perform monitoring control.

10: Plant equipment 20: I / O device 30: I / O network 40: Controller 41: I / O network communication unit 42: Control unit 43: Control network communication unit 44: Time management unit 45: Buffer memory 50: Control network 60: Data server 61: Storage unit 70: Time server 44T: Time counter synchronization information 44D: Plant equipment state data with time counter

Claims (3)

In a monitoring control system in which a controller transmits plant equipment state data collected from plant equipment to a host data processing device via a network, and the data processing device monitors and controls the plant equipment based on the plant equipment state data. ,
The controller is
A time management unit for managing the reference time information;
An internal time counter, periodically processing the plant equipment state data for each execution unit time, time counter synchronization information including the reference time information and a reference time counter corresponding to the reference time information, and A control unit for generating plant equipment state data with a time counter in which the time counter incremented every execution unit time is added to the plant equipment state data;
A memory for storing the time counter synchronization information generated by the control unit and the plant equipment state data with the time counter;
With
The said control part reads the said time counter synchronous information and the said plant equipment state data with a time counter from the said memory, and transmits to the said data processor, The monitoring control system characterized by the above-mentioned. In the supervisory control system according to claim 1,
The data processing device includes:
The time at which the plant equipment state data was collected by the controller using the difference between the time counter included in the plant equipment state data with the time counter and the reference time counter, the execution unit time, and the reference time information A supervisory control system characterized by calculating In the supervisory control system according to claim 1 or 2,
The time management unit
The monitoring control system, wherein the reference time information is acquired from the outside via the network.

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