JPH07255093A - Monitor and control equipment - Google Patents

Abstract

PURPOSE:To eliminate that frequent transmission even in a large-scale system, to correctly grasp the state of a measured object, and to improve the system speed. CONSTITUTION:The monitor and control equipment connects plural input/-output devices RIO, which inputs process measured quantities to plural control units 161, 162... connected to a man-machine device 15 through an ethernet transmission line 11; and each input/-output device RIO has an instantaneous informing means which immediately informs the man-machine device of a process measured quantity when the process measured quantity exceeds a specific variation rate, and a periodic informing means which reports the process measured quantity periodically when the process measured quantity is less than the specific variation rate, and the man-machine device has a storage means 21 which stores and holds the process measured quantity sent from the informing means and a display output means 23 which reads the latest process measured quantity on the object of measurement out of the storage means 21 and displays it at an external display request.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a supervisory control device for monitoring the operating conditions of buildings and factories.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional building supervisory control apparatus has a large number of controls in addition to a man-machine apparatus 5 which is a higher-level device having a CPU 2, a CRT apparatus 3, a printer apparatus 4, etc. on a LAN 1. The devices 6 ₁ , 6 ₂ , ... Are connected, and a plurality of input / output devices I / O are connected to the respective control devices 6 ₁ , 6 ₂ ,. A process measurement amount from a measurement target (not shown) is taken in through and transmitted to the man-machine device 5, which is a higher-level device.

At this time, a so-called scan transmission system is adopted in which the transmission right is sequentially transferred at preset time intervals among a large number of control devices 6 ₁ , 6 ₂ , ... Connected on the LAN ₁ . There is. That is, the transmission right control device for example ₆₁ won is transmitted to the man-machine unit 5 takes in the process measurement quantity from the measurement target transmitted from a number of input and output devices I / O within a predetermined time to transfer the transmission right to the next control device 6 _2. Such a series of processing is sequentially repeated.

Therefore, the man-machine device 5 which is a higher-level device
The CPU 2 of FIG. 6 has a memory 11 having an area necessary to capture and store the process measurement amounts transmitted from the control devices, for example, 6 ₁ and 6 ₂ within a predetermined time as shown in FIG. 6A. And each control device 6
_As shown in FIGS. 6 (b) and 6 (c), ₁ and 6 ₂ each have an area required to store the process measurement amount sent from a large number of I / O devices within the transmission right acquisition time. Further memories 12 ₁ and 12 ₂ are provided.

[0005]

By the way, in the supervisory control device as described above, a plurality of control devices 6 ₁ , 6 ₂ , ... Having a transmission function are connected on the main LAN ₁ and are sequentially transmitted at predetermined time intervals. Since the scan transmission method of transferring the right is adopted, when the system scale becomes large due to the increase of the input / output device I / O, each control device 6 ₁ , 6
₂ , ... or the system speed when viewed from each I / O device becomes slow. The reason is that the control devices 6 ₁ , 6 ₂ , ..., LAN ₁ , CPU of the man-machine device 5
This is because the data to be handled by 2 and the like will increase, and the scan time will increase accordingly, and the response will become slower as the number of measurement points increases.

Therefore, until recently, the development technology for the processing speed of the CPU 2 and the control devices 6 ₁ , 6 ₂ , ... Has been used, but in the case of large-scale systems in recent years, the processing speed alone is sufficient. I can't get it.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a supervisory control apparatus capable of transmitting data to a host device without reducing the processing speed even in a large-scale system.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a plurality of control devices are connected to a man-machine device which is a host device via a transmission line.
In each of these control devices, an input / output device for fetching a process measurement amount measured from a required measurement target is connected, and in each of the input / output devices, a predetermined change rate is set in advance, and the process When the measured amount exceeds the predetermined rate of change, an immediate reporting means for immediately issuing a process measured amount to the man-machine device via the corresponding control device, and the process measured amount to the predetermined rate of change. When less than, the periodical reporting means for reporting the process measurement amount to the man-machine device via the corresponding control device at predetermined time intervals, and the man-machine device, the immediate reporting means and the periodical Storage means for storing and holding the process measurement amount sent by the reporting means while specifying the process measurement amount for each of the input / output devices, and the storage means from the storage means based on a display request from the outside. A monitoring controller and a display output means for displaying the latest process measurement of measured object is read.

Next, in the invention according to claim 2, a plurality of control devices are connected to a man-machine device which is a higher-level device via a transmission line, and each of these control devices is measured from a required measurement object. In a supervisory control device to which an input / output device for taking in a process measurement amount is connected, each input / output device is preset with a predetermined rate of change, and when the process measurement amount exceeds the predetermined rate of change, immediately Immediate reporting means for reporting a process measurement amount to the man-machine device via the control device corresponding to the above, and a control device corresponding to every predetermined time when the process measurement amount is less than the predetermined change rate. Through the periodical reporting means for reporting the process measurement amount to the man-machine device through the above, the process measurement amount is compared with a predetermined limit value, and when the process measurement amount exceeds the limit value, that effect is given. Alarm data transmission means for transmitting alarm data to the man-machine device via a control device, wherein the man-machine device outputs the process measurement amount sent by the immediate reporting device and the periodic reporting device. First storage means for storing and holding each input / output device while specifying and storing the same, second storage means for storing the alarm data sent by the alarm data sending means, and the above-mentioned based on a display request from the outside. The monitor control device includes a display output unit that reads out and displays the latest process measurement amount of the measurement target from the first storage unit, and an alarm notification output unit that immediately outputs an alarm when the alarm data is received.

[0010]

Therefore, in the invention corresponding to claim 1, by taking the above-mentioned means, the process measurement amount is compared with the predetermined change rate in each input / output device, and the process measurement amount is set to the predetermined value. When the rate of change is exceeded, the process measurement amount is immediately issued, the input / output device is specified and stored in the storage means of the man-machine device, and when the process measurement amount is below a predetermined rate of change, the process measurement is periodically performed. Since the amount is reported and the input / output device is specified and stored in the storage means of the man-machine device, there is no fear of frequent notification, but the state of the measurement target can be accurately grasped and the transmission traffic is averaged. The system speed can be improved, and on the man-machine side, the display time of the CRT device can be increased by immediately reading out from the storage means and displaying the process measurement amount of the input / output device after requesting the operator to display. Rukoto is not.

Next, in addition to the operation of the invention according to claim 1, the invention according to claim 2 compares the process measurement amount with a predetermined limit value in the input / output device, and the process measurement amount is limited. When the value exceeds the value, alarm data to that effect is sent to the man-machine device via the control device and stored in a storage means different from the storage means for measuring the process measurement amount, and whether or not there is a display request by the operator. Regardless of CRT
Since an alarm is automatically output by the device or other means, it is possible to immediately know the abnormal state of the measurement target.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, the device of the present invention adopts the Ethernet as a system in order to be able to sufficiently cope with a large-scale system, and adopts an event driven system without adopting the conventional Sukiyan transmission system, In addition, immediate and periodic alerts are issued according to the rate of change of data.

That is, this apparatus adopts the event driven method instead of the scan transmission method. Here, the event driven method is a method in which a state change is detected at the end and an alarm is issued only when this state change occurs. The reason for adopting the event-driven method is that the operating rate of the CPU on the host device side can be significantly reduced by issuing an alarm only when the process measurement amount is equal to or higher than a preset change rate.

However, even if this event-driven method is adopted, the C on the man-machine device side by the operator is
If an RT device makes a data request to a lower I / O device at the time of a display request, the I / O device side will collect the process measurement amount after the data request, and the CRT
The display time of the device is rather increased.

Therefore, the apparatus of the present invention appropriately secures the process measurement amount issued by the event driven method regardless of the display request of the CRT apparatus, and when the operator issues a CRT display request on the man-machine apparatus side, If the latest process measurement amount of the lower I / O device can be displayed immediately, the display time of the CRT device and eventually the operating time of the man-machine device can be reduced.

By the way, on the lower equipment side, there is a problem of how much state change occurs in the process measurement amount, that is, setting of the change rate relating to the measurement amount. For example, if the set value of the rate of change is around 1%, it is a range that can occur due to normal fluctuations of the measurement target (temperature, electric energy, power factor, etc.), so there is a risk that it will be frequently reported.
The transmission traffic becomes large and the system speed becomes slow. On the other hand, if the set value of the rate of change is set to a large value, in this case, the sluggish fluctuation will be ignored, and the alarm will not be issued at all.

Therefore, in order to accurately grasp the fluctuation state of the process measurement amount, it is necessary to accurately grasp the state of the measurement target on the subordinate device side by issuing a periodic alarm every fixed time. Moreover, when there is a large change in state, it is necessary to immediately issue an alert.

The device of the present invention has been realized in consideration of the above demands, and an embodiment thereof will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the device of the present invention. To this device, a man-machine device 15 having a CPU 12 having a data processing function, a CRT device 13, a printer device 14 and the like is connected on an Ethernet transmission line 11. Further, a plurality of control devices 16 ₁ , 16 ₂ , ... Are connected to the transmission line 11 of the Ethernet, and a large number of remote input / output devices RIO, are connected to each control device 16 ₁ , 16 ₂ ,. ... is connected.

As shown in FIG. 2, the CPU 12 includes a measurement amount holding memory 21 for holding a process measurement amount sent from the remote input / output device RIO in a normal state and at a rate equal to or higher than a set change rate, and also the remote input / output device. RIO
A state holding memory 22 for holding the state at the time of the alarm sent from is provided, and the latest process measurement amount of the measurement target is read from the measurement amount holding memory 21 and displayed based on the display request from the outside by the operator. Also, when receiving the alarm status data (alarm data), the output means 23 displays the status data and immediately notifies the user by voice or the like.
Is provided.

This measurement amount holding memory 21 is shown in FIG.
Each remote input / output device RIO11 ... RIO
1n, RIO21 ... RIO2n has an area for holding the process measurement amount at each measurement point, and the state holding memory 22 has the remote input / output devices RIO11 ... RIO1n, RIO21 ... RIO2n as shown in FIG. 3B.
The condition that caused the alarm at each measurement point, such as the upper limit,
It has an area for holding status data such as lower limit, upper limit, lower limit.

Next, each of the remote input / output devices RIO1
i (i = 1, 2, ...) is a program memory that stores program data, self-identification data, a memory that stores change rate data and upper limit, lower limit, upper upper limit, lower lower limit data necessary for issuing an alarm, An alarm determination unit that determines whether the process measurement amount is in a predetermined change rate range, for example, 1% to less than 5% (regular alarm) or a change rate of 5% or more (immediate alarm) according to the program data, and this determination. When the rate of change is within a predetermined range, the means for determining the time for issuing a periodical alarm at regular intervals, and whether the process measurement amount exceeds the upper limit, the lower limit, etc., and the process measurement amount exceeds the limit value. At this time, alarm data sending means for sending the status data to that effect are provided.

Next, the operation of the apparatus configured as described above will be described. Now, each control device 16 ₁ , 16 ₂ , ...
Each of the remote input / output devices RIO1i, which is a subordinate of the above, takes in the process measurement amount according to the program data, and the process measurement amount is within a predetermined change rate range of 1% to 5%
Determine if it is 5% or more. Here, when the process variable is within a predetermined change rate range of 1% to less than 5%, the process measurement amount data is added to the self-identification data at every predetermined time to issue a report.
The data is stored in the corresponding area of the measurement amount holding memory 21 of the CPU 12 via the corresponding control device. The reason for issuing an alarm when the process measurement amount is within the predetermined change rate range of 1% to less than 5% is that it is necessary to grasp the state of the subordinate device.

On the other hand, when the rate of change of the process measurement amount fetched by the remote input / output device RIO1i is 5% or more, it is judged that there is a state change, and the process measurement amount data is added to the self-identification data to immediately issue an alarm. , Is stored in the corresponding area of the measurement amount holding memory 21 of the CPU 12 via the corresponding control device. After the change rate of the process variable exceeds 5% or more, the notification is issued after a fixed time, so the notifications from the lower side at fixed intervals are averaged, the transmission traffic is also averaged, and the system speed Further improvement can be achieved.

Further, in the remote input / output device RIO1i, the captured process measurement amount is compared with preset upper limit, lower limit, upper upper limit and lower lower limit data, and when the process measurement amount exceeds, for example, the upper limit, measurement is performed. It is determined that the object is abnormal, and similarly, the self-identification data is added with the state data indicating that the upper limit is exceeded, and the data is transmitted to the man-machine device 15, which is a higher-level device. At this time, the output means 2 on the CPU 12 side
In No. 3, the data type transmitted from the lower order side is stored in the measurement amount holding memory 21 in the case of data relating to, for example, periodic notification and immediate notification, while it is stored in the state holding memory in the case of data relating to alarms. It stores in 22.

Here, the output means 23 on the CPU 12 side is
When the display request is received from the operator, the process measurement amount to be measured is already stored in the measurement amount holding memory 21, so the content of the holding memory 21 is read out and the CRT is read.
If it is displayed on the device 13, the latest state of the measurement target, for example, the state of change of the process as shown in FIG. 4, can be grasped, and the state change with a change rate of 5% or more can be grasped easily.

When an alarm is issued, the output means 23 on the CPU 12 side receives the status data from the lower side, stores it in the status holding memory 22, and automatically sets the CRT device 14 to the display status. The state indicating that the process variable exceeds the upper limit value is displayed or an alarm is issued.

Therefore, according to the configuration of the above embodiment, when the process measurement amount exceeds the predetermined change rate, the process measurement amount is immediately issued, the input / output device is specified, and the man-machine device 15 is specified. Of the measured amount holding memory 21 of the man-machine device 15 by specifying the input / output device. Since it is stored in, the state of the measurement target can be accurately grasped while there is no fear of frequent notification, and the system speed can be improved by averaging the transmission traffic. Further, on the man-machine device 15 side, immediately after the display request is made to the operator, the measurement amount holding memory 2
It suffices to read the process measurement amount from 1 and display it.
The display time of the T device 13 is not increased.

When the process measurement amount exceeds a predetermined limit value, alarm data to that effect is sent to the man-machine device 15 via the control device, and the state holding memory 22 is sent.
And whether or not there is a display request from the operator,
Since the alarm is automatically output by the CRT device 13 or other means, the abnormal state of the measurement target can be immediately known.

In the above embodiment, the process measurement amount is issued from the remote input / output device. However, for example, the change rate data of the process measurement amount is issued instead of the process measurement amount, or the process measurement amount is changed. And the change rate data of the process measurement amount may be simultaneously issued. In addition, the present invention can be modified in various ways without departing from the scope of the invention.

[0030]

As described above, according to the present invention, the following various effects are exhibited. According to the invention of claim 1, when the process measurement amount exceeds a predetermined change rate, an immediate alarm is issued, and when the process measurement amount is equal to or less than the predetermined change rate, a periodic alarm is issued, and a storage means of the man-machine device. Since it is stored in the memory, it is possible to accurately grasp the state of the measurement object without increasing the risk of frequent alarms, and to improve the system speed. Further, since the process measurement amount can be read out from the storage means and displayed immediately after the operator makes a display request, the display time of the CRT device is not increased.

Next, according to the invention of claim 2, when the process measurement amount exceeds the limit value, it is sent to the man-machine device and stored in the storage means, and the CRT device is irrespective of whether or not there is a display request from the operator. Since an alarm is automatically output to, etc., you can immediately know the abnormal state of the measurement target.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a supervisory control device according to the present invention.

FIG. 2 is a diagram showing functional blocks of a CPU that constitutes the man-machine device shown in FIG.

FIG. 3 is a diagram showing a data area of a holding memory shown in FIG.

FIG. 4 is a diagram showing a change state of a process measurement amount.

FIG. 5 is a diagram showing a system configuration of a conventional monitoring control device.

FIG. 6 is a diagram illustrating a relationship between occupied times of a CPU on a higher-level device side and a control device on a lower-level side.

[Explanation of symbols]

1 ... Ethernet transmission line, 12 ... CPU, 13 ... CRT
Device, 15 ... Man-machine device, 16 ₁ , 16 ₂ , ... Control device, RIO ... Remote input / output device, 21 ... Measurement amount holding memory, 22 ... State holding memory, 23 ... Output means.

Claims (2)

[Claims] 1. A plurality of control devices are connected to a man-machine device, which is a higher-level device, via a transmission path, and each of these control devices has an input / output device for capturing a process measurement amount measured from a required measurement target. In the connected monitoring control device, each input / output device is preset with a predetermined change rate, and when the process measurement amount exceeds the predetermined change rate, the manipulator is immediately notified through the corresponding control device. Immediate reporting means for reporting a process measurement amount to a machine device, and when the process measurement amount is less than the predetermined change rate, the process measurement amount is transmitted to the man-machine device via a corresponding control device at predetermined time intervals. The man-machine device has the process measurement amount sent by the immediate reporter and the periodical reporter for each of the input / output devices. A monitor and control device characterized by having storage means for storing and holding while setting and display output means for reading out and displaying the latest process measurement amount of the measurement target from the storage means based on a display request from the outside. . 2. A plurality of control devices are connected to a man-machine device, which is a higher-level device, via a transmission line, and each of these control devices has an input / output device for fetching a process measurement amount measured from a required measurement target. In the connected monitoring control device, each input / output device is preset with a predetermined change rate, and when the process measurement amount exceeds the predetermined change rate, the manipulator is immediately notified through the corresponding control device. Immediate reporting means for reporting a process measurement amount to a machine device, and when the process measurement amount is less than the predetermined change rate, the process measurement amount is transmitted to the man-machine device via a corresponding control device at predetermined time intervals. When the process measurement amount exceeds the limit value, the alarm data indicating that is issued through the control device when comparing the process measurement amount with a predetermined limit value. An alarm data sending unit for sending to the man-machine device, wherein the man-machine device specifies the process measurement amount sent by the immediate reporting unit and the periodic reporting unit for each of the input / output devices. While storing and holding the first storage means, the second storage means for storing the alarm data sent by the alarm data sending means, and the measurement from the first storage means based on a display request from the outside. A monitor and control apparatus comprising: a display output unit for reading and displaying the latest process measurement amount of an object; and an alarm notification output unit for immediately issuing an alarm when the alarm data is received.