SU1405082A1 - Device for remote monitoring of state of bi-positional objects - Google Patents

Abstract

The invention relates to automation and computer technology and can be used to connect two-position sensors with microprocessor-based control devices for remote, for example, mine objects. The device provides reliable control with checking the health of communication lines, the number of which is significantly less than the number of monitored sensors. The device contains at point 1 of the control source of alternating voltage source 21, a transformer 5, a source of direct voltage with pins 19, 20, resistors 6, 7, 14, 18, diodes 15, registers 8, 9, information reading unit 10, optocouplers 12, 13. At each monitored object 2, the device contains diodes 16 and contact sensors 17. The monitoring of the state of the sensors is carried out by passing one half-wave of current through an electrical circuit. Monitoring of communication lines is checked at another current wavelength. 1 il. SS

Description

About SP O 00

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The invention relates to automation and computer technology and can be used to connect on-off sensors with microprocessor-based control devices of a mine object, and can also be used in other areas where a solution of a similar problem is required.

I The purpose of the invention is to increase the reliability and density of information transmission over the communication lines of the device.

The drawing shows an electrical functional diagram of a device for remotely monitoring the state of two-position objects.

The device contains item 1 of the control, monitored objects 2.1-2n, lines 3.1 -3n and 4.1-4 tons of communication.

The control station contains a transformer 5 with the opening of the secondary winding, the second 6 and the third 7 resistors, the first 8 11 second 9 registers, the information reading unit 10, the EVLA communication line 11, the second and first optocouplers 12.1-12p and 13.1- 13t, respectively, the first resistors 14.1-14.m and diodes 15.1-15t.

On each actuating unit is installed; 1eny are diodes 16.1–16t and contactors / sensors 17.1–17t characterizing the state of the objects.

In addition, the control item contains the fourth) resistors 18.1-18.t, the source is constant about the voltage with the first 19 and the second 20 terminals and the source 21 of the alternating voltage.

The device works as follows. The controlled objects 2.1-2.p are selected by setting through block 10 and line 11 the corresponding bits of register 9, as a result of which the corresponding key 12.1-12 opens. A positive half-wave of current from the first half of the source 20 through the resistor 6, the public key and the corresponding communication line goes to the selected group of sensors. The passage through the diodes 16.1–16.m and the normally closed contacts of the sensors 17.1–17.t, the current enters the 4.1–4t connection lines and, through the resistors 14.1–14.m, lights the LEDs of the 13.1–13.t keys. From the output of these keys, the signals are removed by register 8 and transmitted through block 10 to trunk 11. When the state of any sensor contact is open, the current does not flow into the corresponding 4.1–4 line. The diode of the optocoupler key does not turn on, and a high potential is fed to the input of register 8 through resistors 18.1-18. The interrogation of the next groups of sensors is similar to that described and is performed by changing the control word in register 9. A full cycle of interrogation of all sensors occurs over N periods of the frequency of source 21.

The control of the presence of a short circuit in the sensor lines is made by a negative half-wave source 21. In the absence of a short-circuit, the current of the negative half-wave flows through a resistor 7, diodes 15.1 -15.t, resistors 14.1-14.ms and LEDs 13.1-13.sh LEDs light up. If there is a short circuit in any sensor circuit (for example, as shown by the dashed line), the series-connected resistor 7, diode 15.1, lines 4.1-3.1 of communication, the key 12.1 and resistor 6 are applied to the full voltage of source 21 (transformer 5 ), which leads to its division in proportion to the values of resistors 6 and 7 and the resistance of the wires of the communication lines. By adjusting the resistor 7, the potential of point a.1 is set relative to the midpoint of transformer 5 to zero. As a result, the LED of the key 13.1 does not light up and a high voltage level is applied to the first input of the register 8, since the output element of the key 13.1 is closed. Information about the presence of a short circuit in the sensor lines of the register 8 through block 10 is transmitted to the highway 11. The presence of a short circuit in the sensor lines is an emergency condition of these lines. In order to quickly detect it, the device allows you to perform a parallel survey on all lines in one half-cycle of the frequency of the transformer 5. In this mode, through the register 9 all switching switches 12.1-12 turn on and, if there is a short circuit in any circuit it is detected, but no group of sensors is detected, where a short circuit has been generated. This group is identified after working off the emergency mode by sequentially polling each individual group.

Claims (1)

Invention Formula A device for remotely monitoring the state of on-off objects, which contains a source of alternating voltage, diodes, first optocouplers and first resistors, the first output of each of which is connected to the cathode of the corresponding diode, and the contact sensor and diode on each controlled object connected to the first pin of the contact sensor, and the communication line, characterized in that, in order to increase the reliability and density of information transmission over the communication lines of the device, there vedeny second opto keys, registers the information reading unit, second, third and fourth resistors, a source of DC voltage and a transformer, the primary winding terminals of which are connected to a source of alternating pin HA3 14050824 yarn, the general output of the secondary winding-second register, the outputs of which through transformer ki through the LEDs of the first LEDs of the second optocouplers of the keys of the co-optocouplers are connected to the second with the second output of the source to the first resistors, the first output voltage, on each counter-secondary winding of the transformer, t-1 contact is entered through each 5 the second resistor is connected to the first output sensors and t-1 diodes, the cathodes of which the second of the optocouplers, the second you are connected to the first pins according to the secondary winding of the transformer of the chewing contact sensors, the second output rez third resistor connected to ano-every second optocoupler key item I will give diodes, the first output of the source is pos-.Q control through the appropriate line This voltage is connected to the anodes of the diodes through the fourth re- connection; the resistors are connected to the inputs of the first reactive monitored object, in the heater and through the first optocoupler switches of the same name contact datums the second output of the constant source source of all monitored voltage objects to the groups and through the corresponding connected to the inputs of the readout unit, 15 communication lines are connected to cathodes of which are connected to the inputs of the control point diodes.