JPS5844547A - Transmitting system of alarm signal - Google Patents

Abstract

PURPOSE:To realize the accurate detection of an alarm signal with an economical constitution, by securing a consecutive connection between an alarm monitor processing part and plural alarm detecting circuit parts. CONSTITUTION:A pulse oscillator OSC provided in an alarm monitor processing part P is constituted so that its oscillating frequency is varied by an external capacitor C and a resistance R. For instance, if an alarm detecting contact rl1 of an alarm detecting circuit S1 closes, the capacitor C and the resistance R are connected in parallel for the oscillator OSC. Thus the OSC has oscillations with frequency f1. When an alarm detecting contact rl2 of the next alarm detecting circuit part S2 closes, the capacitor and a resistance 2R are connected in parallel to the OSC to decide the frequency f2. The OSC has oscillations with the frequency f2. In the same way, the capacitor C and a resistance iR are connected in parallel to the OSC when an alarm detecting contact rli of an alarm detecting circuit part Si closes. Thus the frequency fi is decided, and the OSC has oscillations with the frequency fi.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm signal transmission method, and relates to an alarm signal transmission method for transmitting the status of a plurality of alarm detection circuits to a common alarm monitoring processing section. In the data control system, failures in the cooling system, etc. may lead to malfunctions, so it is necessary to promptly detect this and take appropriate measures.

Conventionally, for example, to monitor abnormalities in the cooling system, there is an 8If detector that detects temperature rise.
FAN wheel rollover detectors for detecting rollback reduction are widely used, and when an abnormality is detected, these detectors close an alarm detection contact and output a contact signal. If these detectors detect an abnormality, the power is turned off or the system is turned off.

Conventionally, the Wc connection between the alarm detection circuit section and the alarm monitoring geographical section was connected, for example, in the form shown in Figure 11g1. is the alarm detection circuit section. As shown in the figure, one individual alarm detection circuit section 8. ~8o is independently connected to the alarm monitoring processing unit PK.
As the number of alarm detection circuits increases, alarm monitoring processing
The number of cables connected to lflP has increased, which not only complicates the cable handling during I & wax production, but also leads to an increase in cost.In order to avoid this, Fig. As shown,
Alarm detection times% @8. There is also a method of connecting the output of -8n in a fixed manner, but in this case, there is a drawback that it is not possible to know which alarm detection 1gl path S detected the abnormality.

The present invention eliminates the above problems and provides an economical Imozuru W!
It is an object of the present invention to enable the alarm detection circuit section of l In the second alarm transmission method for transmitting the state of the alarm to a commonly provided alarm monitoring processing unit, the alarm monitoring processing unit is provided with an oscillator and a capacitor for determining the oscillation frequency of the oscillator, and a second alarm detection circuit is provided. The resistor for determining the oscillation frequency of the above oscillator is divided and provided in each of the above capacitors, and one terminal of the above capacitor is connected to #I.
The first alarm detection 1g is connected to one terminal of the resistor in the J road, and the other terminal 1i of the resistor - the subsequent Iss is connected to one terminal of the resistor in the road part Km,
Hereinafter, the resistance FL of the 72-me detection circuit S circle for the Win check sequentially,
The respective resistors of t-t' are connected in series, and furthermore, this #! 11! ] One terminal of the image point for alarm detection is connected to the other terminal of the resistor of the M part circle, and each arm detection IIl! The other terminal of the alarm detection contact of the IwIs circle is all common. ! After connecting the other terminal of the capacitor in the upper IIaη2-me monitoring processing section, Ij! ! Next, the oscillator is caused to oscillate at a different frequency for each alarm detection 1g circuit section corresponding to the closing or closing of the alarm detection contact.The present invention will be explained below with reference to the drawings.

FIG. 8 shows the block failure of the embodiment according to the present invention, in which P is the alarm monitoring processing section, 8□~S1) is the alarm detection circuit M6 section, OSa is the pulse oscillator, 0 is the capacitor,
R is a resistance %rLh to rtn are alarm detection contacts.

'II! The operation of the example is as follows. 08C installed in the O alarm monitoring unit IM section P circle is set wMt so that the oscillation frequency is reduced by the external capacitor 0 and the rinsing resistor RΦ wax. It is an oscillator. Therefore, for example, the alarm detection contact rt of the alarm detection circuit section 81
When l is closed, capacitor to and resistor R are connected in parallel to O80. ! k, which determines the frequency a
Oscillation operation is performed at ll.

Further, for example, when the alarm detection contact rlfl of the next alarm detection circuit sS is closed, capacitor 0 and resistor 11B are connected in parallel to 08C, and oscillation operation is performed at the frequency f determined by this. . below,
Similarly, when the alarm detection contact r l 1 of the alarm detection circuit tm81 closes, 080; C and resistance iR are parallel IjI! Therefore, the oscillation operation is performed at the frequency fl determined by this k.6 As described above, the OSO performs the oscillation operation at a different frequency for each of the % alarm detection circuit sections 81 to Sn.
By measuring the oscillation station aa of the SO at the indicated frequency, it is possible to identify in which alarm detection circuit section the alarm detection contact is closed. In other words, the fifth signal of ARA is delivered.

In the Yokisho example, each alarm output circuit section 81~
It is not necessary to make all the resistances of the 8° circle the same value! It is clear that there is no '. Furthermore, in the embodiment, the frequency is identified by a frequency counter, but if the number of alarm detection circuits is small, an audible sound can be generated by connecting a speaker or the like to the output of the oscillator. It is possible to identify the alarm detection circuitry.

Note that in the present invention, if a plurality of contacts close at the same time, only the foremost Agum Yokode circuit will be identified, and the rear alarm detection circuit section will not be identified. However, in systems where the possibility of multiple alarms occurring at the same time is low, it is difficult to effectively apply the method of the present invention. It is possible to connect the thresholds with the alarm detection circuit section of the 7215 in an easy-to-understand manner, and also to distinguish and identify the alarm signals from each 7215 detection circuit section. You can also have the good friend effect of being able to do this.

[Brief explanation of drawings]

1 and S are diagrams showing a conventional example, and FIG. 8 is a block diagram of an embodiment according to the present invention. In FIG. 8, P is an alarm monitoring processing section. 80 to S0 are alarm detection times W&, OSO is a Norse oscillator, 0 is a capacitor, R is a resistance %, and rt1wr4n is an alarm detection contact.

Claims (1)

[Claims] In the second alarm signal transmission method for transmitting the state 1111M of a plurality of alarm detection circuit sections to a common alarm monitoring processing section, an oscillator and a capacitor for determining the oscillation station of the oscillator are installed in the alarm monitoring escape section. In addition to making a profit, alarm detection 1 of the above 4Ia! l! A resistor for determining the frequency of the oscillator is divided and provided in each of the circuit sections, and one terminal of the capacitor is connected to one terminal of the resistor in the first alarm detection circuit section. 2nd alarm detection following the other terminal of @
Connect one end tK of the resistor of the Rozheng circle, and then connect Jig in sequence.
Connect each resistor in series up to the 41st resistor in the alarm detection circuit, and furthermore, connect the other resistor of the 6th resistor in each of the plurality of alarm detection circuits to the resistor in the 41st alarm detection circuit. Connect one terminal t of the contact for the alarm side to the terminal.
- Withdraw and detect each of the above alarms 1gIwks
The other terminal of the one point for alarm detection in the device is all connected to Imozuru 2 in common, and then connected to the other terminal of the capacitor in the alarm monitoring processing section, and the corresponding alarm 5 is connected when the alarm detection device is closed. An alarm signal transmission system characterized in that an alarm signal g is transmitted by causing the oscillator to oscillate with m*a of KJ% per detection circuit section.