JPH0666151U - Communication control device - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to understand the cause of power failure without increasing communication load. [Composition] In a communication control device provided in various devices connected to a local area network, a power-on message transmission unit that starts up when the power of the device is turned on and creates a message indicating the power-on , An exception processing unit that causes a delay from the power switch cut of the device to the actual power cut, and when the power switch is cut, the cause of this power cut is determined and a message showing the cause is displayed together with a message indicating the power cut. A power-off message transmitting unit to be created, and a communication control unit that broadcasts the message to the local area network when a message from the power-on message transmitting unit and a message from the power-off message transmitting unit are given. Message holding a message broadcast from another device. A communication control device comprising a sage holding unit. [Effect] The required communication may be performed twice when the power is turned on and when the power is turned off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a communication control device that is installed inside various devices connected to a local area network, a computer device, etc., and supports communication operations. It will improve.

[0002]

[Prior art]

 Local area networks have been adopted in various fields, and it is becoming more common to connect computers and other devices to this network and operate them as one logical system. In such a system, it is indispensable to recognize the operating state of the devices in the system, particularly the power-on state of the power supply of other devices in a certain device. Conventionally, the following method has been adopted as a method for mutually knowing the energization states of the devices connected to such a local area network. (1) A device sends a communication request to another device that wants to know the energization state, detects the presence of response communication, and if there is response communication, the device is in the operating state, and if there is no response communication, the power is cut off. It is in a state. (2) A device that is energized continuously performs communication that indicates its own existence at regular time intervals, and the device that receives this communication shuts down the power of other devices due to the interruption of communication. Know the condition.

[0003]

[Problems to be solved by the device]

 Although the above two methods are known, these methods have the following problems. In other words, the common points of the two methods are that the operator intentionally turned off the power by the correct procedure when there was no response communication from the device that inquired about the energized state, or an abnormal state during operation of the device. It is unknown whether or not the power has been cut off, and it may not be possible to know the cause of the power cut to other devices, and it may take some time before the power status of other devices can be clearly confirmed. There was an inconvenience. In particular, it is fatal when operating a dynamically coupled system that it is impossible to know the cause of the power failure of other devices. In addition, the time until the energized state of another device is known is the waiting time until the response communication is returned from the device inquiring about the energized state in the method of (1) and the method of (2). , Which corresponds to a time equal to the time interval of communication representing the existence of oneself. However, the method (2) can solve this problem by shortening the time interval, but it is not preferable because it increases the communication load of the network.

The present invention solves such a problem as a problem, and promptly knows the cause of whether the power supply to the device connected to the local area network is intentionally shut down or due to an abnormality. The objective is to realize a communication control device that is capable of doing so.

[0005]

[Means for Solving the Problems]

 The present invention that achieves such an object provides a communication control device provided in various devices connected to a local area network, which is activated when the power of the device is turned on, and a message indicating that the device is turned on is displayed. A power-on message transmission unit to be created, an external processing unit that causes a delay from the power switch cutoff of the device to the actual power cutoff, and the cause of this power cutoff when the power switch is turned off. When a message is sent when the power is turned off and a message is sent from the message sending unit when the power is turned on and a message is sent from the message sending unit when the power is turned off. The communication control unit that broadcasts the message to the local area network and other devices. A communication control apparatus characterized by comprising a message holding unit for holding a broadcast communication message from a.

[0006]

The communication control device of the present invention broadcasts a power-on message to another device when the power of the device to be connected is turned on, and powers off the other device when the power switch is turned off. Broadcast communication of the disconnection message and the message indicating the cause. Messages from other devices are received and evaluated by the message holding unit.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual block diagram showing a communication control device of the present invention, and this device is built in various devices such as computer devices installed in a local area network. In this figure, the power-on message transmitting unit 1 is a block that creates a message indicating power-on when the power supply for this communication control device is turned on. In the CPU exception generating circuit 2, the power switch SW is turned off (off). Block that generates an exception interrupt signal to the CPU (not shown) when the power is turned off, the exception processing unit 3 receives the exception interrupt signal and delays from the power switch SW disconnection to the actual power disconnection. The message transmission unit 4 receives the signal from the exception processing unit 3 and creates a message indicating the power failure and its cause (power failure due to normal procedure, power failure due to device error). The message from the power-on message transmitter 1 and the message from the power-off message transmitter 4 are broadcast to the network (not shown). Block (simultaneous communication to all devices), the message storage unit 6 is a block for holding a message from another device received by the communication control unit 5.

Next, the operation of the device of the present invention thus constructed will be described. When the power of the communication control device is turned on, the power-on message transmission unit 1 creates a power-on message indicating that the power is turned on. Then, the communication control unit 5 receiving this message broadcast-transmits this power-on message to other devices connected to the network.

When the power switch SW of the device is turned off (disconnected), the CPU exception generation circuit 2 detects this and sends an exception interrupt signal to the CPU and the exception processing unit 3. The exception processing unit 3 receives this exception interrupt signal and causes a certain delay from the power switch SW disconnection to the actual power supply disconnection, and also transmits the power supply disconnection signal to the power-off message transmission unit 4. The power-off message transmitting unit 4 determines the cause of the power-off due to the operator's normal procedure or the power-off due to an abnormality inside the device, and indicates the power-off and its cause. Create a message. The cause can be determined by, for example, setting a flag for normal power failure or abnormal power failure in the power-off message transmitter 4, or obtaining information determined by the CPU. Then, the communication control unit 5 receiving this message broadcast-transmits this message to other devices connected to the network.

On the other hand, when the power-on message and the power-off message as described above are broadcasted from another device, the communication control unit 5 receives these messages, and the message holding unit 6 receives these messages. Hold. By reading out the message held in the message holding unit 6 and evaluating it, the CPU can grasp the power-on state or power-off state of other devices and the cause thereof. Further, it is preferable that the message holding unit 6 has a table format corresponding to each device installed in the system so that the energization state of each device can be recognized.

In the device of the present invention configured as described above, each block of the power-on message transmission unit 1, the power-off message transmission unit 4, the communication control unit 5, and the message holding unit 6 is actually It is better implemented by a software program.

[0012]

[Effect of device]

 As described above, according to the communication control device of the present invention, when grasping the energization state of another device, the message holding unit can be referred to when necessary, so that the network can be accessed almost in real time. You can check the status of other devices without doing so. Therefore, an advanced application program can be built in a local area network in which the configuration of connected devices is dynamic. Also, the communication required is only required when the power is turned on and when the power is turned off, and there is almost no load on the network.

[Brief description of drawings]

FIG. 1 is a conceptual block diagram showing a communication control device of the present invention.

[Explanation of symbols]

 1 Power-on message transmission unit 2 CPU exception generation circuit 3 Exception processing unit 4 Power-off message transmission unit 5 Communication control unit 6 Message holding unit

Claims (1)

[Scope of utility model registration request] 1. A communication control device provided in various devices connected to a local area network,
A power-on message transmitting unit that starts up when the power of the device is turned on and creates a message indicating power-on; an exception processing unit that causes a delay from power-off of the device to actual power-off; When the power switch is turned off, the cause of the power cut is determined, and a message indicating the power cut and a message indicating the cause are created, and a message from the power on message transmission unit and a message from the power-on message transmission unit. A communication control unit that broadcasts the message to the local area network when the message from the power off message transmission unit is given, and a message holding unit that holds the message broadcast-transmitted from another device. A communication control device comprising: