JPS60207902A - Backup device of process controller - Google Patents

Abstract

PURPOSE:To switch a defective process controller automatically to a backup unit by detecting a process controller to be used as the backup unit on the basis of a backup designating signal. CONSTITUTION:Detecting the trouble of a process controller 4, a state monitoring device 31 outputs a backup designating signal B to a constitution control device 32. The control device 32 searches a controller 4 waiting as a backup and makes a transmission control device 34 load a program image or data image F of a function of the failed controller to the searched controller 4. Then, the control device 32 designates to start the backup controller 4 and resets a constitutional state memory 33 to a new state. Thus, backup switching can be automatically executed at the trouble of a process controller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a backup device in the event of a failure of a Zorose controller (sequence controller).

[Technical background of the invention and its problems]

In recent years, with the expansion of the processing capacity of Zorothes controllers and the expansion of the fields of application, there are many systems in which several dozen Zorothes controllers are used in one system, and their functions have also changed. The conventional simple sequence control is being expanded to extremely advanced sequence control.

With this expansion of process controller functionality,
The valid period of the data handled by the Zorocess controller is also significantly longer than in the past. That is, in the conventional process controller of this type, since the valid period of data is short, there is no need to restore the r-data, and there is no particular problem if the controller is initialized and restarted. However, in recent years, as the validity period of data has become longer, if the data had to be recovered by humans when a failure is restored, the plant would have to be stopped for a long time, resulting in extremely large losses.

Furthermore, as the scope of application expands and a large number of process controllers are used, it is costly to prepare backup devices on a one-to-one basis (N=n(N)n)
However, in this case, even if the backup machine was loaded with a nologram, it was necessary to shorten the plant stoppage time, so prompt decision-making was required.

In addition, a very reasonable type of backup device is called the cyclic backup method.If one Norocess controller is damaged, the process controller that has been on standby will be used as a backup machine, and the If the process controller is used as a backup machine after the controller is restored, if the backup machine is switched over one by one by a human, the human system will have to load the noogram for each o-ra, and the process controller will become the backup machine. There was an opening that meant it would take a long time to restart, rather than being extremely troublesome.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and is a backup process controller that can automatically perform backup switching at 11 o'clock because of the process controller, and can quickly perform plant control after switching. The purpose is to provide equipment.

[Summary of the invention]

In order to achieve the above object, the present invention includes a condition monitoring device that monitors the condition of each Zorothes controller and outputs a backup instruction signal when an abnormality is detected, and a condition monitoring device that outputs a backup instruction signal from the condition monitoring device. It is equipped with a configuration control device that determines the function of the Zorothes controller in which an abnormality has occurred and a process controller that can be used as a backup device, and stores the program rota of this function and the latest data image on the storage device. This is a backup device for the Zorothes controller that allows it to be restored and restarted, thereby shortening the period during which the Zorothes is stopped.

[Embodiments of the invention]

The present invention will be described below with reference to the drawings, but first a schematic configuration of an apparatus to which the invention is applied will be described with reference to FIG. Reference numeral 1 denotes a loop-shaped data way (data transmission path), and a plurality of data transmission control devices 2 are installed on this data way 1 at a predetermined distance.

A backup device 3, which is a device of the present invention, is connected to one of the data transmission control devices 2, and a Zorose controller 4 is connected to each of the other data transmission control devices f2. .

A storage device 5 is connected to the backup device 3 for storing program logs or data images for each of the process controllers 4, which will be described later.

FIG. 2 is a block diagram showing an embodiment of the backup device 3 shown in FIG. It consists of

The condition monitoring device 3 inputs the status signal A of the process controller 4 from the r-transmission control device 2, constantly monitors the operating condition of the process controller 4, and sends a backup instruction signal B when a failure condition of the process controller 4 is detected. This outputs the following.

The configuration control device f132 controls the start, stop, and program load of the process controller, and when receiving a backup instruction signal B from the status monitoring device 31, outputs a configuration status signal E to a configuration status memory 33, which will be described later.
It searches for a process controller 4 that is on standby as a backup, and outputs a start signal C to this Zorose controller 4 via the city data transmission control device 2, and also sends a Zorogram data transmission approval signal to the transmission control device 74. It outputs the following. Note that a console (not shown) is connected to the configuration control device 32.

The configuration state memory 33 stores the correspondence between the physical process controller and the actual function when the program for each function is loaded into each Zorocess controller 4, that is, it receives the configuration state signal E from the configuration control device 32. This configuration status signal E is stored in a sending control device 34, which will be described later.
and is output to the data storage device 35.

The transmission control device I\34 manually receives the data transmission request signal from the configuration control device 32, extracts the program image or r-timer stored in the storage device 5, and sends it to the transmission control device 2. When the loading of the program image or data image to the process controller is completed, the configuration control device 32 is notified of the completion of the transmission.

The data storage device 35 receives data and image storage requests from each of the process controllers, stores the data images in the storage device 5, and stores the data images in the configuration state memory 3.
The configuration status signal E from the storage device 5 is read out or determined and the data is stored in a storage area in the storage device 5.

The storage device 5 inputs the data image G from the data storage device 35 and outputs the program image or data image of each Zorose controller to the transmission control device 34.

Next is the back ara configured as above! The operation of the device will be explained. The initial activation of each sequence controller 4 is instructed from outside by an operator, and according to the instruction (the n-formation control device 32 loads a program for each function to each process controller 4 via the transmission control device 34. The status of the allocation of the process controller 4 and the functions is set in the configuration status memory 33.

When each process controller 4 starts control in this way, each Zorocess controller 4 performs maintenance as necessary.
l! The data image G that requires
It will be sent on 5th.

Data image G transmitted to data storage device 35
The sender's process controller)o-24t7) configures the functions of the process controller 4 from NO3 to the configuration state memory 33.
The configuration status signal E from the memory device 5 is sequentially indexed and the data is stored in the memory area of the function in the memory device 5. This operation can be performed as long as each Zorothes controller 4 is operating normally.
Continues repeatedly. Furthermore, if the Zorose controller 4 fails, this operation is stopped, and therefore, the most v'' data is retained in the storage device 5.

The volatile state of each process controller 4 is determined by the state signal A of the process controller 4 obtained via the data transmission control device 2. When a failure is detected, a buffer instruction signal B is output to the configuration control device 32. configuration control device gt
32 is a backup instruction signal Bf: upon receiving it, it checks the configuration state memory 33, searches for a standby process controller 4 as a backup, and sends the program image or data image F of the function of the failed machine to the transmission control device 33 for the process controller 4. Load. When this loading is completed, the feed (g control device 3
4 notifies the configuration control device 32 of the completion of the transmission, and the configuration control device 32 instructs the backup machine Zorocess controller 4 to start &lI, and also writes the configuration state memory 33
From the above, (1)
There is no need to run the backup machine in the Noroses controller 4, making it possible to have a flexible backup configuration. Since the zone of 3-failure = rj is recovered, there is an effect that the recovery of function becomes faster.

There are systems in which it may be dangerous if the process controller 4 of the Quag machine immediately enters control after switching to the Quag machine.
A restart condition determination device may be added. This restart condition determination device inputs the ground state and determines whether restart is possible. By adding this, when starting the process controller of the backup machine, τ determines whether startup is possible based on the ground state at that time. You can decide whether to actually start it or not. An example of this is when an operator makes an emergency shutdown of a plant as a result of a failure; in this case, the state of the plant may be unpredictable, and it is often safer not to start it up.

〔Effect of the invention〕

According to the present invention described above, a backup of process controller=2 can be automatically switched to a backup when a process controller fails, and can quickly perform ground control after switching! equipment can be provided.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a schematic configuration of a device to which the present invention is applied, and FIG. 2 is a block diagram showing an embodiment of a backup device for a process controller according to the present invention. DESCRIPTION OF SYMBOLS 1... Data way (data transmission path), 2... Data transmission control device, 31... Status monitoring device, 32...
Configuration control device, 33... Configuration state memory, 34...
Transmission control device, 35... Data storage device, 4... Process controller, 5... Storage device.

Claims (1)

[Claims] In a system that backs up a plurality of process controllers connected to a current data way by N-m (N)m), the status of each process controller is monitored and a backup instruction signal is sent when an abnormality in a process controller is detected. a configuration control device that determines the function of the process controller in which the abnormality has occurred and a process controller that can be used as a backup device when a backup instruction signal from the condition monitoring device is manually input; , a storage device for storing a gramogram image of each function of the process controller or a data image sent by the process controller during production, and the condition monitoring device detects an abnormality in the process controller and detects the abnormality. The configuration control device determines the function of the Zorothes controller that has occurred and the location of the Zorothes controller of the Barafatsuji machine, thereby restoring the program image and the latest data image of that function on the storage device, and restarting. A process controller pack-a-de device featuring the following features: