JPS5884390A - Alarm signal transmission system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (1) Technical field of the invention The present invention relates to an alarm signal transmission method to 1%.

The present invention relates to an alarm signal transmission method for transmitting the status of a plurality of alarm detection circuit units in common to an alarm monitoring processor 1111K.

(Shuku technology background In data processing systems such as electronic computers.

There is a high possibility that this will lead to malfunction of the fault line in the cooling system, etc., so it is necessary to promptly detect this and take appropriate measures. Conventionally, temperature detectors that detect temperature increases and F'AN rotation detectors that detect decreases in fan (FAN) rotation speed have been widely used, for example, to monitor abnormalities in cooling systems. When the device detects an abnormality, it outputs a contact signal that closes or opens the alarm detection contact.

When these detectors detect an abnormality, the output of the detectors is sent to the alarm monitoring processing section in order to cut off the power, display the location of the abnormality, or perform the necessary processing. ◎(3) Prior art and problems Conventionally, the connection between the alarm detection circuit section and the alarm monitoring processing section is as shown in Figure 1, for example, IN1. 81 is an alarm monitoring processing section, and 81 to BrU alarm detection circuit section. As shown in the figure, one individual alarm detection circuit section S, ~S
As the number of alarm detection circuits increases, the number of cables connected to the alarm monitoring processing unit P increases, making cable processing complicated when manufacturing the device. Not only was this a problem, but it also resulted in an increase in costs. In order to avoid this, as shown in FIG. 52, the alarm detection circuit section 8. There is also a method in which the output of ~8n is connected in a fixed manner, but in the above case, there is a drawback that it is not possible to tell which alarm detection circuit unit has detected the abnormal sound.0 (4) Purpose of the Invention The present invention solves the above problem. (5) Structure of the Invention In order to achieve the above object, the present invention provides an alarm signal transmission system that transmits the states of a plurality of alarm detection circuit sections to a commonly provided alarm monitoring sensitive layer 11, in which an impedance measuring circuit is provided in the alarm monitoring processing section. In addition to making a profit, each of the plurality of alarm detection circuit sections described above,
An alarm detection contact is provided that is closed during normal operation and opened when an alarm is detected, and one measurement terminal te of the impedance measurement circuit is connected to one terminal of the alarm detection contact in the first alarm detection circuit section; Connect the other terminal of the alarm detection contact to one terminal of the alarm detection contact in the second succeeding alarm detection circuit section, and then connect each terminal to the alarm detection contact in the n-th alarm detection circuit section in this order. The alarm detection contacts of the above are connected in series, and further, in each of the plurality of alarm detection circuit sections, one terminal of the resistor is connected to the other terminal of the alarm detection contact in the circuit section, and the above-mentioned The other terminal of the resistor in each alarm detection circuit section is all connected in common to II! and then connect it to the other measurement terminal of the impedance measurement circuit in the alarm monitoring processing section am, and when the alarm detection contact is opened, the alarm monitoring processing section detects a different resistance value for each corresponding alarm detection circuit section. It is characterized by transmitting an alarm signal by causing

(6) Embodiments of the Invention The present invention will be explained below with reference to the drawings. ◎Figure IK3 is a block diagram of an embodiment of the present invention.

P is an alarm monitoring processing section, s1 to 8n are alarm detection circuit sections, RFi resistors, and r11 to rln are alarm detection contacts. As shown in the figure, the alarm monitoring processing section P includes:
Contains an impedance measurement circuit and a fault location indication circuit.

The working butterfly of the example is the following 9. Alarm monitoring section
1st part P? Is the impedance measurement circuit of i a measurement terminal? ,
-T and has the function of measuring the resistance value between them and sending the result to the fault location display circuit. The fault location display circuit determines the fault location based on the resistance value information sent from the impedance measurement circuit, and displays the fault location t-.
It has a display function.

For example, when the alarm detection circuit section 8.0 alarm detection contact rlB opens, the measurement terminal of the impedance measurement circuit! , --the impedance of the barrier is infinite.9. The impedance measurement circuit detects this infinity and notifies the fault location display circuit.

As a result, the failure location display circuit identifies that the alarm detection contact r14 of the alarm detection circuit section S1 is in the open state, and displays an alarm to that effect.

For example, the primary alarm detection circuit section 8. When the alarm detection contact rll opens, the measurement terminals T, -T! of the impedance measurement circuit open. A resistance value R is connected between them, and the impedance side leg circuit detects the resistance value R and notifies the fault location display circuit. As a result, the failure location display circuit identifies that the alarm detection contact rll of the alarm detection circuit section S is in an open state, and displays an alarm to that effect. Similarly, the alarm detection contact rli of the alarm detection circuit section S1 is in the open state 111.
To become and.

Measurement terminal of impedance side leg circuit? , -T, in between.

The resistance value R is (1-1) connected in parallel.

"death The impedance measurement circuit detects the resistance value -1 and notifies the fault location display circuit. Due to this.

The fault location display circuit identifies that the alarm detection contact rli of the alarm detection circuit section 81 is in an open state,
An alarm will be displayed to that effect.

As described above, different resistance values are detected by the impedance measurement circuit each time the alarm detection contacts r11 to rlnf:) of the alarm detection circuit units 81 to an are opened. It is possible to identify in which alarm detection circuit unit the alarm detection contact is opened. That is, an alarm signal is transmitted.

In the above embodiment, each alarm detection circuit section 81 to B
Although all the resistances in n are assumed to have equal values, it is clear that they do not necessarily have to be the same.

Note that in the KsP of the present invention, if multiple contacts are open at the same time, only the foremost alarm detection circuit will be identified, and the subsequent alarm detection circuits will not be identified. However, the method of the present invention can be effectively applied to systems in which the possibility of multiple alarms occurring simultaneously is low.

(1) As described in detail, according to the present invention, it is possible to connect the alarm monitoring processing unit and the plurality of alarm detection circuit units in a seamless manner, and also to connect the alarm monitoring processing unit and the plurality of alarm detection circuit units, and to It can distinguish and identify alarm signals, and has the advantage of being able to accurately detect alarm signals with an economical configuration.

[Brief explanation of the drawing]

1 and 2 are diagrams showing a conventional example, and FIG. 3 is a block diagram of an embodiment according to the present invention. In FIGS. 1 and 3, P is an alarm monitoring processing section; 8. ~h is the alarm detection circuit section,
rl□ to ran are alarm detection circuit units, and R is a resistor.

Claims (1)

[Scope of Claims] In an alarm signal transmission method for transmitting the state m of a plurality of alarm detection circuit sections to a common alarm monitoring processing section, the alarm monitoring processing section is provided with an impedance measuring circuit. Each of the plurality of alarm detection circuit sections is provided with an alarm detection contact that is closed under normal conditions and opened when an alarm is detected, and one measurement terminal of the impedance measurement circuit is connected to the first alarm detection circuit section. Connecting to one terminal of an alarm detection contact, and connecting the other terminal of the alarm detection contact to one terminal of an alarm detection point in a subsequent second alarm detection circuit section,
Thereafter, each alarm detection contact is connected in series up to the alarm detection contact in the nlIth alarm detection circuit section, and further, in each of the plurality of alarm detection circuit sections, the alarm detection contact in the circuit section is connected in series. One terminal of the resistor is connected to the other terminal of the resistor, and the other terminal of the resistor in each of the alarm detection circuit sections is connected to the other terminal of the impedance measuring circuit in the alarm monitoring processing section. Connecting to the measurement terminal of K and causing the alarm monitoring processing section to detect a different resistance value for each corresponding alarm detection circuit section when the alarm detection contact is opened; and transmitting an alarm signal from K. Signal transmission method O