JPS6367616A - Electronic equipment - Google Patents

Abstract

PURPOSE:To shorten the system recovery time after a power supply is suddenly cut off by holding the cut-off of the power supply in an off-line state despite occurrence of abnormality as long as a logical connection is secured with another equipment. CONSTITUTION:An on-line/off-line setting means 9 is kept away from an off-line state until the end of connection despite occurrence of abnormality as long the means 9 is connected logically to another equipment. A power supply control part 5 cuts off a power supply after an off-line state is set by the means 9. In other words, the off-line state is inhibited while the logical connection is secured with another equipment and an under-communication mode is shown. Then the off-line state is set after the end of communication and said logical connection. Thus it is possible to avoid an abnormal separation from another equipment in a communication mode and therefore to ensure the quick recovery of troubles for the entire system including software.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electronic device such as a peripheral device in a computer system, especially an emergency power shutoff when an abnormality occurs in the power supply, cooling fan, or internal temperature of the device. It is related to the method.

[Conventional technology]

In recent years, electronic devices, such as computer systems, have become increasingly complex both as devices themselves and as systems, and have come to play a central role in society. Along with this, not only is there a demand for higher reliability of electronic devices, but also consideration is required from the design stage to enable prompt recovery even if the electronic device once breaks down.

On the other hand, on the electronic device side, the pure electronic circuit portion of the electronic device is responding to social demands by reducing the number of parts and improving the reliability of each component due to advances in integrated circuit technology and packaging technology. Part 2 mechanical parts that handle electric power, such as power supply circuits and cooling fans, have not achieved significant improvements in reliability due to their nature. However, failure of these parts
This will immediately cause the entire device to stop, and there is also a great danger of heat generation.

For this reason, in electronic devices larger than a certain scale, as shown in FIG. 1, a main power source 2a and a sub power source 2b are used in a communication section such as a logic circuit section 1.

2C, the operating status of the cooling fan 3, etc., and the temperature inside the device using the temperature detector 4, and if an abnormality is detected, the power supply to the power supplies 2a to 2C and the fan 3 is immediately stopped. A power supply control unit 5 has been provided. In the figure, 6 is a receiving element, 7 is a transmitting element, and 8 is a select signal bypass circuit.

In this case, in order to minimize the impact on the entire system even if an individual device suffers from an emergency power cut-off, the system equipment that makes up a large computer system must be connected to other devices (computer and its peripheral devices, it suppresses the output of the transmitting element 7 to prevent other devices from malfunctioning by emitting noise (usually called a channel), or operates by bypassing the select signal from other devices after the power is turned off. Considerations were taken to notify the system of its inability to operate, and to logically disconnect it from the entire system (generally referred to as an offline state).

[Problem that the invention seeks to solve]

However, in this type of system, if an abnormality in the power supply, etc. is detected while the device is logically connected and communicating with another device, the device will go offline and suddenly disconnect during communication. You will end up being rejected. If such a situation occurs, unlike the case where communications are properly terminated and then logically disconnected, there is a strong possibility that other devices will be affected and become inoperable. , there is a high risk that the software logic will not close correctly and the entire system will become inoperable.

If such a situation occurs, even if hardware repair of the failed device is completed immediately, software recovery and file repair will take a lot of time, resulting in downtime for the entire system. This means that it will be extended.

[Means for solving problems]

In order to avoid such a situation, the present invention prevents the device from going offline while the device is logically connected to another device and indicates that it is in the middle of communication, and prevents the device from going offline when the communication is completed. By providing an online/offline setting means 9 that sets the offline state to prevent a new logical connection from occurring after the connection state is broken, and a power supply control unit 5 that shuts off the power supply after the offline state, it is possible to connect with other devices. This avoids abnormal disconnections during communication and enables prompt failure recovery of the entire system, including software.

Further, in another invention, a light failure determination means 5A is provided for determining when the failure or abnormality is light, and this light failure determination means 5A is provided.
The above control is performed using the output of , and the others are immediately offline.
This is to set the power off state.

[Effect]

If the online/offline setting means 9 is logically connected to another device, even if an abnormality occurs, the power supply control unit 5 waits until the above connection is completed to be in the offline state, and the power supply control unit 5 is set to the offline state by the same setting means. After that, turn off the power.

In another invention, the above operation is performed only when the failure or abnormality is minor, and when the failure or abnormality is not minor, the device goes offline and the power is cut off even if the logical connection is made.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, numbers 1 to 8 are the same as in FIG. In this case, the logic circuit section 1 serving as the communication section has a connection state display signal output means IA that detects when the logic circuit section 1 is in a logical connection state and communicating with another device. In addition, when the accident is small-scale, such as failure of the auxiliary power supplies 2b, 2c+ fan 3, or abnormal temperature detection of the temperature detector 4, and there is no need to immediately interrupt the logical connection with other devices, the power supply control unit 5 It has a light failure determination means 5A that detects this and outputs an offline request signal Q. Reference numeral 9 denotes an online/on-line device including a state memory element that can indicate whether or not it is in a logical connection state with another device based on a signal from the logic circuit section of this electronic device.
This is an offline control circuit.

An example of this part is shown in FIG. In FIG. 3, F/Fl (10) is set to logic "1" when it is in a logical connection state with another device by the connection state display signal M from the output means IA of the logic circuit section 1; It is a state storage element that is reset to logic "0" when the connection state is broken. F/F2 (11) indicates that logical connection with other devices is possible when the logic is ``1'' (known as online status), and indicates that connection is not possible when the logic is ``0'' (offline status). state) is a state memory element. The negative logic output of this F/F2 (11) is sent as a bypass request signal to the select signal bypass circuit 8 shown in FIG. bypasses the select signal, which is the connection request signal, and rejects the connection request.

In Fig. 3, the online signal and the offline signal are usually provided on the operation panel of the device.
A signal that comes from an offline switch. When the device is operating, the online signal is logic "1" and the offline signal is logic "0."
It is Ko. As a result, F/F2 (11) becomes logic “1”
” to indicate that this device is online. Note that 12 and 13 are AND gate circuits, and 14 is an inversion circuit.

In this device, when the power supply control section 5 in FIG. While transmitting the bypass request signal N to each power source 2a to 2c, the output of the transmitting element 7 is suppressed.

The power supply to the cooling fan 3 and the like is stopped. In this case, the operation is no different from the conventional device shown in FIG.

However, if the detected abnormality is in the sub power supplies 2b, 2c, the cooling fan 3, or the temperature detector 4, which does not immediately affect the logic operation, the minor failure determination means 5A of the power supply control section 5 After determining this, first, an offline request signal Q is issued to the online/offline control circuit 9. At this time, if there is no logical connection with another device, F/Fl (10) is reset to logic "0", and the offline request signal Q is immediately transmitted to F/F 2 (11).
) to logic "0" and the device goes offline. However, if the F/F 1 (10) is logically connected to another device at this time, the offline request signal Q is suppressed and the F/F 1 (10) is set to logic "1".
F2 (11) is not reset. Therefore, the offline state is awaited. After that, when the communication with other devices is finished and the logical connection is broken, F/Fl (10) is reset and the offline request signal Q is changed to F/F2 (
11), F/F2 (11) is reset and the device is prohibited from receiving new connection requests from other devices and goes into an offline state. After that, after a certain period of time has passed, the power supply control unit 5
After suppressing the output of the transmitting element 7, the power supply to each of the power supplies 2a to 2c and the cooling fan 3 is stopped to complete the emergency power cutoff operation. At this point, even if the logical connection state with other devices continues, the off-line request signal N is also sent directly to the select signal bypass circuit 8 to prevent dangers such as overheating. However, except for special situations such as a hung amplifier in the system, the logical connection relationship with other devices will be temporarily resolved within this certain period of time, so there is almost no possibility that the device will go offline while still connected.

Additionally, even if this device loses its logical connection with another device, it will be difficult to restore the system if the device is taken offline unless it is reconnected and communicated again. In some cases (for example, when a magnetic disk device is temporarily disconnected from a computer channel during a head movement operation), even after the logical connection is resolved, the F/ Fl (1
0), reconnect, and then reset F/Fl (10) after the post-processing is completely completed.

〔Effect of the invention〕

As described above, according to the present invention, even if an abnormality occurs, if there is a logical connection with other devices, the system can be restored after an emergency power shutdown because it waits for the power to be shut off as an offline state. This has the effect of significantly reducing time.

Further, according to another invention, the above operation is performed at the time of a minor failure,
In the event of another serious failure, the system is set to an offline state and power cutoff state regardless of logical connections, so reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional device, FIG. 2 is a block diagram of an electronic device according to an embodiment of the present invention, and FIG. 3 is a detailed view of a part thereof. ■ is a logic circuit section as a communication section, IA is a connection status display signal output means, 2a to 2C are power supplies, 3 is a cooling fan, 4
is a temperature detector, 5 is a power supply control unit, 5A is a light failure determination means, 8 is a select signal NO, ? 9 is an online/non-offline setting means, and 10 is a state memory element indicating the logical connection state with other devices. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa (and 2 others) Procedural amendment (addressed to himself)

Claims (2)

[Claims] (1) A select signal bypass circuit that sets online or offline for other devices, a communication section such as a logic circuit section that is logically connected to and communicates with the other devices, and detects a failure within the device. An electronic device comprising a power supply control section for controlling opening/closing of a power supply, a connection state determination means for determining a logical connection state between the other device and the communication section, and an output of the connection state determination means and the above. An online/offline setting means is provided for controlling the select signal bypass circuit based on the output of the power supply control section, and the online/offline setting means is configured to detect a failure when the power supply control section is in a logically connected state with another device. In this case, after waiting for this logical connection to be released, the select signal bypass circuit is controlled to set the offline state, and the power supply control section cuts off the power after setting the offline state. (2) A select signal bypass circuit that sets online or offline with respect to other devices, a communication section such as a logic circuit section that is logically connected to and communicates with the other devices, and detects a failure within the device. In an electronic device comprising a power supply control unit that controls the select signal bypass circuit to bring it into an offline state and shuts off the power supply, a light failure determination means detects when a failure in the device is a minor failure, and the above-mentioned others. connection state determination means for determining a logical connection state between the device and the communication section; and an online circuit for controlling the select signal bypass circuit based on the output of the connection state determination means and the output of the light failure determination means. An offline setting means is provided, and the online/offline setting means waits for the logical connection to be released when the minor failure determination means detects a minor failure while in a logically connected state with another device. and then controlling the select signal bypass circuit to set the offline state, and the power supply control section cutting off the power after setting the offline state.