SU841007A1 - Multichannel monitoring device - Google Patents

Description

one

The invention relates to a system for transmitting signals using a pulse code, is intended for use in telemechanics, and can perform functions of multipoint monitoring of sensors with approximately the same frequency of sensor signals.

A device for multichannel monitoring is known, which contains a setpoint adjuster, key circuits, a switchboard, comparison units, a random access memory unit, control elements for indications, and primary information sensors. The settings setpoint for each channel (or parameter) is preset in the setpoint adjuster and the corresponding setpoint 1 is connected when the sensor is connected.

However, the device does not allow to increase the accuracy of control under the conditions of destabilizing factors acting simultaneously on all sensors.

The closest to the proposed technical entity is a device for multi-channel control, which contains serially connected clock generator, distributor, switch, analyzer, information rejection unit, the second input of which is connected to the first output of the automatic control circuit, the second output of which is connected to the second input analyzer, and the second output of the distributor is connected to the input of the automatic control circuit.

The disadvantage of the device is that the threshold frequency is set

0 absolute value. The signals from the sensors have a different frequency, but under the influence of external disturbing factors acting on the frequency of the sensors, their value can vary, 5 remaining equal to each other. It is necessary to register a decrease in the frequency of one or several sensors relative to the frequency of the main mass of the sensors, while changing the frequency

0 the bulk of the sensors should not cause the registration of violation signals. In the known device, due to the simplicity of the hardware implementation, the frequency of the threshold is set by the absolute value and at such a level that changes in the frequency of the main mass of sensors under the influence of external disturbing factors do not reach the threshold frequency. This leads to

0 that under nominal conditions

The frequency of the main mass of the sensors is much higher than the threshold and therefore, in order to register a decrease in the frequency of one of the sensors, one must wait for this frequency not to fall below the absolute value of the threshold frequency, which may adversely affect the control of the equipment where the sensors are installed.

Thus, a drawback of the device is the low accuracy (or resolution) of monitoring or fixing the frequency deviation of one of the sensors relative to the frequency of the main mass of the sensors.

The purpose of the invention is to increase the accuracy of sensor monitoring.

The goal is achieved in that a device for multichannel control, containing a clock generator, the output of which is connected to the distributor input, the first photo input of which is connected via a serially connected switch and the analyzer is connected to the first input of the frequency deviation signal output unit, the second input of which is connected to the first output of the unit control, the second output of which is connected to the second input of the analyzer, the second output of the distributor is connected to the input of the control unit, comparison blocks, memory block and recording block are entered information, the input of which is connected to the first output of the first comparison unit, and the output to the first input of the memory unit, the second input of which is connected to the second output of the analyzer, which is connected to the first input of the second comparison unit, the second input of which is connected to the output of the memory unit, the first input The comparison unit is connected to the third output of the control unit, the second output of the first comparison unit is connected to the input of the second comparison unit, and the third output is connected to the third input of the analyzer.

Fig. 1 shows a block diagram of a device for multi-channel monitoring; in fig. 2 — absolute and relative frequency thresholds for one of the possible patterns of variation in the frequency of the main mass of the sensors.

The device for multichannel control contains a clock generator 1, a distributor 2, a switch 3, blocks 4 Outputting frequency deviation signals, a control unit 5, an analyzer 6, a first control unit 7, a second comparing unit 8, an information recording unit 9, a memory unit 10. In addition to FIG. 2, line 11 indicates the possible nature of the change in the frequency of the bulk sensors, 12 is the absolute frequency threshold, 13 is the relative frequency threshold for a given nature of the frequency variation of the main mass of the sensors,

The device works as follows.

The clock generator 1 sets the speed of operation of the distributor 2, the code of which determines the address of the sensor connected via switch 3 to the input of the analyzer 6. The analyzer 6 measures the sensor signal digitally and the measurement code goes to the second comparison unit 8 where it is compared with the code written register 10 memory on the previous sensor.

The result of the comparison is fed to the second comparison unit 8, where another comparison of the difference with the fixed setpoint for the difference

8In case, if the difference is less than the setpoint, a block permission is issued.

9 recording information and it gives a recording pulse to memory block 10 where the analyzer code on this sensor is recorded. If the resulting difference is greater than the specified setpoint for the difference, then the information recording block 9 is inhibited, and the memory is not written to the memory block 10, and the previously recorded value remains, while the analyzer 6 is given a signal that causes the first signal CB, Besides,

The analyzer 6 also preserves the absolute threshold in frequency, below which the first signal is output, even if the signal from the second comparison unit 7 is not received, this is done so that if all the sensors start decreasing the frequency at the same time, for example, by removing supply voltage from the sensors, the signal from the second block 7 of the comparison may not be received, but the signal from the analyzer 6 with an absolute threshold will arrive. If, during a single bypass of all the sensors, the first n signals are dialed, a second signal is output, which is checked in the second bypass cycle of all the sensors. The result of the first bypass is stored in the frequency deviation signal output unit 4, and if the second signal again comes out in the second bypass, it is output to external circuits. The output pulse from the distributor output goes to the control unit 5, which after the arrival of a certain number of such pulses performs an automatic monitoring the operability of the device, for this purpose, the input of the analyzer 6 receives signals simulating the deviations of the sensor signals. After all the signals have been dialed, the autocontrol is stopped, for which the distributor 2 is reset, and a signal is sent to the second comparison unit 7, where it is prohibited to output the first signal on this sensor and the analyzer code value is allowed to be written to the memory block.

what is the initial setting, threshold of operation.

The introduction of additional elements allows, while maintaining the absolute threshold in frequency, having low accuracy (or resolution), and relative control of the sensors (relative to each other), which achieves more early detection of sensors having a lower frequency, and this leads to acceleration of the alarm dangerous situation on the equipment where the sensors are installed,

Claims (2)

1. USSR Author's Certificate No. 450183, cl. G 06 M 15/46, 1974, 2. USSR author's certificate number 426236, cl. G 08 C 19/28 (proto5 type of) . d.2 //