SU427369A1 - DEVICE FOR ACCEPTANCE OF FREQUENCY AND FREQUENCY-PULSE TELECOMECHANICAL INFORMATION - Google Patents

Description

one

The invention relates to telemechanics and can be used in devices for measuring alternating magnitudes, signaling transmissions, deviations of the parameter of the measured value from the nominal value and in a number of other cases when the received information arrives in the form of frequency and pulse frequency signals.

Devices are known for receiving frequency and frequency-pulse telemechanical information containing a driver connected via logic to a counter, the outputs of which are connected to a digital recorder via a decoder.

However, such devices convert the frequency or pulses of a signal into an analog value, and then with the help of the device “aialog code into a digital value. This reduces the accuracy and complexity of the device. To obtain additional information about the measured value (for example, a change in direction, sign) on the transmitting side, the nature and duration of the pulses are changed with the help of signal sensors or blocks, or an additional signal-code is transmitted over the communication channel, which also complicates the transmitting side of the device. .

In the proposed ye: operation, these disadvantages are eliminated by the introduction of a control unit and an additional information selection unit. Moreover, one input of the additional information allocation unit is connected to the last output of the counter, its outputs are connected to other inputs of the counter and the digital register, respectively, and the other input is connected to the first output of the control unit, the second and third outputs of which are connected respectively to the control inputs of the descrambler and counter, and the input of the control unit is connected to the output of the time sensor.

In the proposed device for receiving frequency telemechanical information of an absolute value and additional signaling about its features, a control number is functionally recorded in the counting device, functionally related to the minimum frequency value, measurement time and frequency deviation. The received frequency frequency, the formation converted into pulses, or the received i.pulses and pauses are received for a fixed intermediate time in the counting device, where the control number is dragged by the incoming pulses. The difference (the remainder of the control number) expresses in decimal code the absolute value of the parameter being measured and at the transmitting end of the telemetry. Depending on the sign of the rest of the control number in the trigger of the allocation block for additional ...:

. J ..,; -. The signal is received, which characterizes the additionally telemeasurable parameter. In order to significantly simplify the device, HeiM used a non-reversible counter operating in 1-2-4-2 code (Aiken code), in excess-3 code or another code with symmetrical inversion. The use of such codes allows us not to change the nature of the counter operation, but only by simply switching the storage elements to the counter in the decoder, to get both subtraction and addition, with the addition of one pulse, which corresponds to the passage of the counter through the zero value. The block diagram of the device is given in the drawing. The device receives frequency telemechanical information that has two qualitative values of the measured parameter that must be reproduced as an alarm at the receiving end, without any additional devices and without signaling on the transmitting side and without directly transmitting these values to the communication channel. The device contains a driver named after them, pulses /, a logic circuit "NOT 2, a pulse counter 3, operating in a code with a symmetrical inversion. The number of bits of the counter is determined by the reference number that is written to it, and the minimum value of the parameter being measured. A decoder using memory elements (relays, trigger, etc.) records the result of the counter operation and provides the decimal code to the digital indicator 5, a digital printing machine or a computer. The additional information allocation unit reveals additional information about the absolute value of the parameter being measured (for example, a sign) at the moment all the trigger cells of counter 3 are in the zero state with the control number L completely counted for the frequency of the parameter being measured. The device also contains a control unit 7 and a time sensor 5. To clarify the operation of the proposed receiving device of the frequency telemetry information, consider a formula expressing the dependence of the measured value on the frequency DL P {- fmin Pj + / gill -, where Pmax is the maximum value measured value; the current value of measurements of magnitude and frequency; minimum frequency of telemetry; frequency deviation (in Hz); frequency deviation region, where the measured parameter has one qualitative value, and may take

427369. A concept is introduced — the measurement time of the teleP K of the measured parameter (in sec.) T,., T-n-F, from where Rtam, where / s is the scale factor equal to 1 X X W with q equal to an integer or zero. Replacing the value of P in the general formula, we obtain the expression for PI-PI K + {7 - IP.nin n FI-TF ,. The expression for the current value of the measured parameter P K allows us to conclude that, by setting the frequency deviation region on the non-detrimental side of the telemetry, where the telemeasurable parameter has one qualitative value, this region can be deduced without any irregularities through the channel communication of additional information about this area by counting the periods of the received frequency. For this purpose, the control number N 1P, pgp + P / P1 is entered into the counter 3. In this case, the expression for the current value of the parameter being measured can be written Pi K ± / N-FiTI. Thus, to obtain the absolute value of the measured parameter, it is sufficient from the control number N recorded in the counter to subtract the periods or telemetry received during the measurement cycle T. The transition of the counter 3 through a zero value triggers the operation of block 6, which gives a signal on the signal board in digital indicator 5 about a change in the quality of the telemetric parameter. The proposed device works as follows. Frequency or pulse telemechanical information is continuously input to the pulse generator. However, the input of the counter 3 is closed by the circuit “NOT 2, and the counter 3, the control unit 7, sets the control number ttAf / T.L / f“ At the beginning of the cycle T, the input of the control unit 7 and the circuit “HE 2 from the time sensor 8 receive a positive potential, the circuit “NOT 2 opens the input of the counter 3, and the pulse maker 1 receives the pulses of the telemetry parameter. The control unit 7 is in standby mode, supplying power to the blocking of the noiseless elements (relays), and the emitters of the respective transistors.

each counting trigger trigger 3 and power to block 6.

Counter 3 operates for a time T until the time sensor 8 removes a positive potential and gives a negative one.

If during the time G in the counter 3 received Fi T pulses, which is less than the control number N, the result will be recorded in the counter 3.

N - Fi.T PK,

numerically equal to the absolute value of the measured parameter multiplied by the scale factor.

If, during time T, the number of incoming pulses in the counter 3 - fi-T is greater than the control number N, then at the moment when the counter 3 passes through the zero position, block 6 receives a pulse and block 6 uses the memory element to fix the telemetry parameter to a new quality condition.

In this case, the block switches the decoder 4 to the output of the result of the operation of the counter 3 in the inverse code; gives the signal board 5 additional information about the measured parameter or this signal is used for other purposes (remote control), and to compensate for the loss of impulse in counter 3 when the decoder 4 is switched to inverse code operation, it introduces an additional impulse into counter 3.

When applying to the input of the control unit 7 and the circuit "NOT 2 from the time sensor 8 negative potential, the circuit" NOT 2 stops the supply of pulses to the input of the counter 3, and the counter 3 stops.

The control unit in strict sequence de-energizes the locking circuits of all the storage elements of the decoder 4 and simultaneously connects to the counter 3 the operation chains of the storage elements of the decoder 4 to record the result of the operation of the counter 5. Depending on the position of the block 6 (worked or not) in the decoder 4, the result of the operation of counter 3 is recorded either in a forward or inverse code. With a time delay that ensures reliable operation of the storage elements of the decoder 4, the control unit connects the circuits of their blocking and then disconnects the operation circuits of the memorizing elements of the decoder 4 from the counter 3.

Simultaneously with the resetting of the result of the operation of the counter 3 for the frequency information measurement cycle, the control unit writes the control number N into this counter and returns (if it worked in the measurement cycle) the block 6, which in turn switches the memory elements of the decoder 4 for record the result of the operation of the counter 3 in the direct code. If the block

6 did not work in the measurement cycle, it remains in its original position and does not perform any actions.

The storage elements of the decoder 4, being already blocked, do not change their position until the end of the next measurement cycle.

So, if the difference

N-Fi. T

is greater than zero, then the storage elements of the decoder 4 by the block 6 are connected in each counting trigger of the meter 3, for example, to the collectors of the left transistors. The decoder 4 issues a direct decimal code. If the difference

N-Fi T

less than zero (negative), then block 6, receiving a pulse from counter 3, records the change in the nature of the measured parameter in comparison with the original one and switches the memory elements of the decoder 4 in each counting trigger of counter 3 from the left transistor collectors to the right. The decoder 4 issues an inverse decimal code. Block 6 also generates a signal about the change in the character of the measured parameter on the signal board 5 and introduces an additional pulse into counter 3.

The description of the operation of the device is given for the general case when Fmin is not zero. In the case when Fmin is zero, the device works in the same way.

Subject invention

A device for receiving frequency and frequency-pulse telemechanical information containing a driver, a NOT logic, a decoder, a digital indicator and a time sensor, the driver input is connected to the device input, and the output from one of the meter inputs via the first logic input NOT, the second input of which is connected to the output of the time sensor, all outputs of the counter, except the last, are connected to all relevant information inputs of the decoder, except the last, and the output of the decoder is connected to ne vym input digital indicator, characterized in that, in order to increase the accuracy of measurement nrinnmaemoy information entered into the machine control unit and extracting information dopolpitelnoy; moreover, one input of the additional information allocation unit is connected to the last output of the counter, the outputs are connected to the other inputs of the counter n of the digital recorder, and the other input is connected to the first output of the control unit. The second and third outputs of which are connected respectively to the control inputs of the decoder and counter, and the input of the control unit is connected to the output of the time sensor.