JPH0431318B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention accurately controls the stop operation of power supply to the inside of the line printer device by detecting the ambient temperature and fan abnormality inside the line printer device. , relates to an alarm detection processing circuit that reports a power supply stop state of the line printer device to a host device.

In information processing systems, line printer devices print out data at high speed.
In order to operate the line printer device normally,
It has a built-in power supply that supplies DC power such as +5V, +12V, and +24V.

In addition to supplying various types of DC power to the inside of the line printer as described above, this power supply is capable of handling abnormalities within the power supply, abnormal rises in the ambient temperature within the line printer, and raising the ambient temperature to a specified temperature. If an abnormal situation occurs, such as stopping the fan motor to keep the temperature below 80°C (normally set at 80°C), a switch etc. will be activated to stop the supply of DC power.

However, since the line printer device is a device that processes important data, it is necessary to accurately control such a power supply stop operation, and furthermore, it is necessary to accurately report the abnormal state to the host device.

[Problems to be solved by conventional technology and invention]

FIG. 2 shows an alarm detection circuit diagram of a conventional line printer device.

The line printer device 1 of this example is connected to a host computer (not shown), and the ambient temperature of the device 1 is detected to be abnormal or not within a specified temperature (80°C or less).
We constantly monitor abnormalities in the fans that are installed to prevent
Operate (close) 2.

Further, the switch SW1 similarly operates (closes) when there is an abnormality in the power supply device 3 (for example, an abnormal rise in ambient temperature). When the switches SW1 and SW2 are operated (closed), the relay RL is operated, and when the relay RL is operated, an alarm signal is sent to a power supply monitoring device (not shown) or the like.

The power supply monitoring device (not shown) monitors the power supply devices 3 of multiple line printer devices 1, and detects the occurrence of an alarm using an alarm signal. Since this function is not provided, it is not possible to identify from which device 1 the alarm signal is generated.

Further, there are cases in which a power supply monitoring device (not shown) is not connected, and there are also systems that do not have a form for connecting a power supply monitoring device (not shown).

Next, when relay RL operates, power supply 3
At the same time, the breaker 2 is tripped, the AC 100V input to the power supply 3 is reduced to zero, and the +5V, +12V,
Stop the supply of power such as +24V.

Furthermore, when the supply of power such as +5V, +12V, +24V, etc. is stopped, if the device 1 is communicating with the host computer (not shown) under the control of the control circuit 4, the cause of the problem is unknown. There was a problem in that it took a lot of time to investigate the cause and recover the device 1.

[Means for solving problems]

An object of the present invention is to realize a novel alarm detection processing circuit that solves the above-mentioned problems. an alarm detecting means for detecting that the power is off and transmitting an alarm detection signal and a power-off control signal; a switch means for turning on and off in response to the power-off control signal; A relay that is connected in series and that cuts off the power supply to the power supply device during operation to stop the power supply from the power supply device, and a gate means that sends the alarm detection signal to the host device when the relay is energized. This problem is solved by the alarm detection processing circuit according to the present invention, which stops the power supply when a switch that operates when an abnormality occurs in the device operates, and reports the power supply stop state of the line printer device to the host device.

[Effect]

When an abnormality occurs in the line printer device and a switch that operates when the device abnormality operates, the alarm detection means detects the operation of the switch and sends out an alarm detection signal and a power-off control signal. When the switch means is turned on in response to this power-off control signal, current flows through the relay connected in series with the switch means and the switch that operates in the event of an abnormality in the device, and the relay operates to stop the power supply from the power supply device. do. At this time, current flows through the relay to open the gate of the gate means, and sends the alarm detection signal sent from the alarm detection means to the host device.

In the above, since the relay is connected in series with the switch that operates when a device abnormality occurs, even if the power-off control signal is sent through the alarm detection means due to the influence of noise etc. when the switch is not operating, the relay is not energized, therefore, the power supply is not stopped and no alarm detection signal is sent to the host device. That is, in the present invention, by accurately controlling the power supply stop operation and reporting the power-off state to the host device, the host device can perform accurate processing.

〔Example〕

The gist of the present invention will be specifically explained below with reference to an embodiment shown in FIG.

FIG. 1 shows a block diagram of an alarm detection processing circuit according to an embodiment of the present invention. The same reference numerals indicate the same objects throughout the figures, 5 and 6 are parts constituting the alarm detection means, 5 is the power-off control signal generation section, 6 is the alarm signal detection section, and 7
Tr1 is an AND circuit that constitutes a gate means, and Tr1 is a transistor that is provided in the power supply device 3 and constitutes a switch means that is turned on and off by a power-off control signal from a power-off control signal generating section 6.

Next, the operation of this embodiment will be explained.

When the switch SW1 is operated (closed), the transistor Tr3 is turned on and sends an alarm signal' to the alarm signal detection section 6 in the control circuit 4. or,
Similarly, when the switch SW2 is operated (closed), the transistor Tr2 is turned on, and an alarm signal is sent to the alarm signal detection section 6 in the control circuit 4.

When the alarm signal detection section 6 detects the alarm signal or the signal ', it sends an alarm detection signal to the AND circuit 7, and also starts the power-off control signal generation section 5, so that the power-off control signal generation section 5 outputs the power supply device. 3 to output a power-off control signal.

When the power-off control signal from the signal generator 5 is turned on (the signal becomes "1"), the transistor Tr1 is turned on, an operating circuit for the relay RL is formed, and a current sufficient to operate the relay RL flows. Note that the signal is extracted at this time.

By outputting this signal, the AND circuit 7 satisfies the AND condition, and sends an alarm detection signal sent from the alarm signal detection section 6 to the host computer (not shown), and outputs the alarm detection signal to the power supply device 3 of the line printer device 1. Notifies that the device has started an operation to stop power supply. Then the current causes the relay to
When RL operates, breaker 2 trips and various DC power supplies (+5V, +
(12V, +24V, etc.) supply stops.

Based on the alarm detection signal from the control circuit 4, the host computer (not shown) displays the power-off state of the line printer device 1, prompts appropriate measures, and maintains the online state with the line printer device 1. Go offline.

Note that when the alarm signal or signal ' is turned on due to noise etc., the transistor is
Even if Tr1 is turned on, relay RL will not operate unless switches SW1 and SW2 are activated (closed), so breaker 2 will not stop due to malfunction.

〔Effect of the invention〕

As explained above, according to the present invention, when an abnormality occurs in a line printer device, the power supply stop operation is accurately controlled, and when the power supply device stops the power supply, power is supplied to the host device. By reporting the supply stop state, it is possible to take prompt and accurate processing in the host device, which has a significant effect on improving the efficiency of processing when the power supply is stopped in the line printer device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an alarm detection processing circuit according to an embodiment of the present invention, and FIG. 2 is a diagram of an alarm detection circuit of a conventional line printer device. In the figure, 1 is a line printer device, 2 is a breaker, 3 is a power supply device, 4 is a control circuit, 5 is a power-off control signal generation circuit, 6 is an alarm signal detection section, and 7 is an AND circuit.

Claims (1)

[Scope of Claims] 1. In a line printer device 1 comprising a power supply device 3 that stops power supply in the event of an abnormality in the device, one or more switches are activated in the event of an abnormality in the device.
SW1, SW2; alarm detection means 5, 6 for detecting the operation of the switch and transmitting an alarm detection signal and a power-off control signal; and switch means Tr1 for turning on/off in response to the power-off control signal. and the switches SW1 and SW with respect to the operating power supply VD.
a relay RL which is connected in series with the switch means Tr1 and the switch means Tr1 and which cuts off the power supply to the power supply device 3 during operation to stop the power supply from the power supply device 3; It is characterized by comprising a gate means 7 for sending a detection signal to a higher-level device, which stops the power supply when a switch that operates when an abnormality occurs in the device is activated, and reports the power supply stop state of the line printer device to the higher-level device. alarm detection processing circuit.