JPH0720166B2 - Control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for a control device for controlling a controlled device.
In particular, the present invention relates to a control device that is connected by communication means or the like and is divided into upper and lower parts.

〔Overview〕

The present invention is divided into an upper means and a lower means, and in a control device in which the two are connected by a communication line, the memory contents of the upper means when a failure occurred in the upper means, the lower means and the communication line is recovered. By automatically downloading to the lower means, the malfunction of the control device can be prevented and the time required for resetting the state after restoration can be shortened.

[Conventional technology]

In the conventional control device divided into upper and lower levels, there is a means for matching the states of the upper and lower sides among the control means of the individual commands for changing the state, and there is no fault in the control device or there is a fault. If there is no change in the state, there will be no inconsistency.

[Problems to be Solved by the Invention]

In such a conventional example device, it is possible to deal with a case where another fault occurs twice during a fault and a state change occurs, or a fault in which a countermeasure is incorporated in advance in each instruction. In the event of an unexpected failure, a state mismatch may occur.

As a result, (a) the control device may malfunction before the human recognizes and copes with the state inconsistency. (B) In order to make the state coincide, the lower-order control device is set once. Since it is necessary to stop and manually reset the status from the host controller, there was a problem that it took time and effort.

[Means for Solving the Problems]

The present invention comprises a state setting means connected to a controlled device for changing the state of the controlled device, and a first state memory for storing the state data of the controlled device referred to by the state setting means. A lower-level control device, a second state memory connected to the lower-level control device via a communication line, for storing state data relating to the controlled device, and the contents stored in the second state memory for the communication line. In a control device having a host control device having a state download means for transferring to the first state memory via the above, the host control device detects whether the fault of the host device has been recovered. Upper state detecting means and communication restoration detecting means for detecting the transmission possible state of the communication line, and the state downloading means has recovered from the failure of its own device and the transmission possible state of the communication line. Characterized in that it comprises a means for activating the self means on condition that the detected.

Further, the lower-level control device includes a start-up detection / notification means for detecting that the failure of the own device has been recovered and notifying the higher-order control device of the detection result. It is preferable to include means for activating its own means in response to the notification from the detection / notification means.

Further, the state downloading means is a means that finally detects when a plurality of means among the start detecting means, the communication restoration detecting means, and the start detecting / notifying means continue to detect. Accordingly, it is preferable to include means for activating its own means.

[Action]

When a mismatch occurs between the status data of the higher-order means and the lower-order means and the status of the controlled device, and when the cause of this inconsistency is removed, the status data held in the higher-order means is downloaded and held in the lower-order means. Change the state of the controlled device based on the data. As a result, it is possible to prevent a malfunction of the control device due to the state mismatch, and to omit the manual work required for the state match.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment. As shown in FIG. 1, this embodiment is composed of an upper control device 1, a lower control device 3, a communication line 2 for controlling the communication between the upper control device 1 and the lower control device 3, and a controlled device 4. To be done.

That is, this embodiment is provided with a state setting means connected to the controlled device for changing the state of the controlled device, and a first state memory for storing the state data of the controlled device referred to by the state setting means. A lower-level control device having
A second state memory that is connected to the lower-level control device via a communication line and stores state data related to the controlled device, and the contents stored in the second state memory to the second state memory via the communication line. A host controller including a status download means for transferring to the first status memory, and as a feature of the present invention, the host controller comprises:
The state detecting means includes a start-up detecting means for detecting that the failure of the own apparatus has been recovered, and a communication recovery detecting means for detecting the transmission possible state of the communication line, and the status downloading means has recovered the failure of the own apparatus. And a means for activating its own means on the condition that the transmission enabled state of the communication line is detected, the lower-level control device detects that the failure of the own device has been recovered, and the detection result is The state detection means includes a startup detection / notification means for notifying the host controller, and the state download means includes means for activating its own means in response to the notification from the startup detection / notification means. When a plurality of the start-up detecting means, the communication recovery detecting means, and the start-up detecting / notifying means continue to detect, a means for activating its own means in accordance with the last detected means Including.

Here, there is a possibility that a discrepancy may occur between the state memory 11 in the upper control device 1, the state memory 31 in the lower control device 3, and the actual state of the controlled device 4. In this embodiment, a state download means 12 is provided as means for matching these states, and a rise detection means 13, a communication restoration detection means 14, and a lower order detection means of the host controller 1 are provided as means for detecting a factor that has to execute the state download. The start-up detection / notification means 33 of the control device 3 is used.

The state inconsistency is caused when one of the upper control device 1 and the lower control device 3 operates independently in a situation in which both the control device 1 and the lower control device 3 cannot perform the same operation. Occur. The causes of such a situation include (a) failure of the upper control device 1, (b) communication failure between the upper control device 1 and the lower control device 3, and (c) failure of the lower control device 3. Therefore, in order to repair the inconsistency of the states, it is sufficient to bring the states into agreement when (a) restoration of the upper control device (b) communication restoration (c) restoration of the lower control device occurs.

FIG. 2 is a flow chart showing the operation for matching the states when the upper control device 1 in (a) is restored. The recovery of the control device 1 is detected by the startup detection means 13, and the startup of the host control device 1 is started (step S1). First, it is determined whether communication is possible (step S2), and if communication is not possible, the process proceeds to the communication recovery process (b) (step S3). If communication is possible, the contents of the state memory 11 storing the state of the controlled device 4 are read (step S4), and the state is downloaded to the lower-level control device 3 via the state download means 12 (message communication). (Step S5). The lower-level control device 3 writes the downloaded message to the state memory 31 (step S6), and sets the state of the controlled device 4 via the state setting means 32 (step S6).
7) Then, the state matching is completed (step S8).

FIG. 3 is a flowchart showing the operation when the communication of (b) is restored. The restoration of communication is detected by the communication restoration detecting means 14 in the host controller 1, and the execution is started (step S9). Subsequently, the same processing as the processing after step S4 in FIG. 2 is performed (step S10).

FIG. 4 is a flowchart showing the operation when the lower-level control device 3 in (c) is restored. The start-up detection / notification means 33 of the lower-order control device 3 detects the start-up of the lower-order control device 3 and starts execution (step S11), and executes a start-up notification (message communication) to the higher-order control device 1 (step). S1
2). In response to the start-up notification from the lower-level control device 3, the control device 1 executes the same download processing as that of step S4 and subsequent steps in FIG. 2 (step S13).

When the factors (a), (b), and (c) are combined, the one that was restored last becomes the factor of the state download, and the state matching process is executed.

〔The invention's effect〕

As described above, according to the present invention, when a factor that may cause a state mismatch occurs, a state download is executed at the time of restoration of the factor to automatically match the states. Eliminates the malfunction of the control device due to
This has the effect of eliminating the need for manual work for status matching.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention. FIG. 2 is a flow chart for explaining the operation at the time of restoration of the host controller. FIG. 3 is a flow chart for explaining the operation when the communication line is restored. FIG. 4 is a flow chart for explaining the operation when the lower control device is restored. 1 ... High-order control device, 2 ... communication line, 3 ... low-order control device, 4 ... controlled device, 11, 31 ... state memory, 12 ...
Status download means, 13 ... rise detection means, 14 ... communication restoration detection means, 32 ... state setting means, 33 ... rise detection / notification means.

Claims (3)

[Claims] 1. A state setting means connected to a controlled device for changing the state of the controlled device, and a first state memory for storing the state data of the controlled device referred to by the state setting means. A lower state control device, a second state memory connected to the lower side control device via a communication line and storing state data relating to the controlled device, and the contents stored in the second state memory A higher-order control device having a state download means for transferring to the first state memory via a line, the higher-order control device detects that the fault of its own device has been recovered. The state detecting means includes a start-up detecting means and a communication restoration detecting means for detecting a transmission possible state of the communication line, and the state downloading means has recovered from the failure of its own device and the transmission of the communication line Control apparatus characterized by state is in the condition that has been detected comprises means for starting the self-unit. 2. The lower-level control device includes a start-up detection / notification means for detecting that the failure of the own device has been recovered and notifying the higher-order control device of the detection result, and the state downloading means The control device according to claim 1, further comprising means for activating its own means in response to the notification from the startup detection / notification means. 3. The state downloading means performs the detection last when a plurality of means among the start-up detecting means, the communication restoration detecting means and the start-up detecting / notifying means continue to detect. 3. The control device according to claim 1, further comprising means for activating its own means in accordance with the means.