SU1087962A1 - Device for checking parameters - Google Patents

Abstract

PARAMETER CONTROL DEVICE, containing the first register connected by the outputs to the first inputs of the block of elements AND, connected by the outputs to the information outputs of the device, characterized in that, in order to improve the speed and reliability of the device, a comparison block, element OR, trigger, the first is entered into it and the second elements NOT, the pulse distributor and the second register connected by the outputs to the corresponding information inputs of the first register and to the first inputs of the comparison unit connected by the second inputs with the corresponding first outputs of the first register, and outputs with the inputs of the OR element connected by the output to the single input of the trigger connected by the inverse output through the first element NOT to the control output of the device, the direct output through the second element NOT to the input of the zeroing of the second register, the first The second and third outputs of the pulse distributor are connected respectively to the control input of the first perncriia, to the second input of the block of elements I and to a about the zero input of the trigger, and the first and second inputs of the pulse distributor soy (L d Inen respectively with the control and clock inputs of the device.

Description

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with joint venture

The invention relates to the field of automation, telemechanics and computer technology and can be used to monitor state sensors of objects.

A device for monitoring discrete objects is known, comprising sensors, input registers, an OR element, two triggers, two keys, a pulse generator, two switches and output registers.

However, this device is characterized by low speed, since it interrogates the sensors sequentially in time.

The closest technical solution to the invention is a switching device for state sensors of objects, containing a register connected by outputs to inputs, consisting of flip-flops, a decoder (AND circuit), a switching unit consisting of AND and OR circuits, with information inputs device inputs, and outputs with the corresponding register inputs. The operation of the device is based on the principle of switching signals arriving at its inputs from the sensors of the state of objects to the corresponding outputs 2.

A disadvantage of the known device is its low speed, since when signals from sensors are simultaneously received, its speed is T n-t, where n is the number of sensors, t is the service time of one sensor; as well as lack of reliability, since if signals from several sensors occur simultaneously due to the presence of races in the circuits of the switching unit, false triggering of the triggers may occur, which will result in false output of the state of the control objects.

The purpose of the invention is to increase the speed and reliability of the device.

The goal is achieved by the fact that the comparison unit, the first register connected by the outputs to the first inputs of the AND block connected to the information outputs of the device, is entered into the comparison unit, the OR element, the trigger, the first and second elements NOT, the pulse distributor and the second register connected by the outputs to the corresponding information inputs of the first register and to the first inputs of the comparison unit connected by the second inputs to the corresponding outputs of the first register and the outputs to the inputs of the OR element connected to the output to a single trigger input connected by an inverted output through the first element NOT to the control output of the device, a direct output through the second element NOT to the zeroing input of the second register, the first, second and third outputs of the pulse distributor connected respectively to the control input of the first register, to the second input of the AND block and to the zero input of the trigger, and the first and second inputs of the pulse distributor are connected respectively to the control and clock inputs devices.

The drawing is given a functional diagram of the device.

The device contains sensor outputs

0 objects state 1, second register 2 consisting of RS-flip-flops 3, first register 4 consisting of D-flip-flops 5, block of elements AND 6, information outputs 7 of the device, block 8 of comparison, consisting of elements EXCLUSIVE OR 9, the element OR 10, the RS flip-flop 11, the first element NOT 12, the second element NOT 13, the distributor 14 pulses, the control output 15 of the device, the control input 16 of the device and the clock input 17 of the device.

0 The device operates as follows.

In the initial state, all the device memory elements are in the zero state, and on all inputs, except for the clock input 17 and the device outputs, there are

5 zero signals. At the clock input 17 of the device, the clock pulses, which are applied to the second input of the distributor 14 pulses, continuously operate, confirm its zero state.

Register 4 is intended for the storage of the output information (storage of the previous state of the sensors).

Register 2 is used to receive the current input information, the signals of which can be of various durations and arrive at any time, including during the issuance of the previous information. This allows you to save any information that goes to the inputs of the device.

The block of elements And 6 represents the two-input elements And, the second inputs of which are connected to each other and the second output of the distributor 14 pulses.

The pulse distributor 14 is a controlled distributor and pulses on three outputs, made on the basis of a shift register. The cycle of his work is equal to the time of hours, the id of three clock pulses, after which it comes to its original state. TC 2T, where Tt is the period of the next clock pulses.

The device continuously monitors the state of the sensors of monitored parameters using the unit 8 of the comparison. When these sensors change the state, it generates a service request signal and sends it to control output 15. In response to a signal, a request from an external device, such as a computer, to control input 16 of this device receives a readiness signal (polling), which starts dispenser 14 pulses. Last

first produces a census of information from sensors stored in register 2 to register 4. Then the pulse distributor 14 reads information from register 4 through a block of elements And 6 to the outputs 7 of the device.

Let us consider in more detail the operation of the proposed device.

In the initial state, a zero signal acts on the zero inputs of the RS flip-flops 3 of register 2, which confirms their zero state. When single signals appear on the single inputs of the flip-flops 3 of the register 2, the single signal present at their zero inputs does not prevent the formation of the single triggers of the single signals on the single outputs. With the disappearance of single signals from single inputs of the triggers 3 of register 2 and the presence of a single signal at their zero inputs, the latter are set to the zero state.

Let the device's inputs from the outputs of the first and second sensors receive single signals that act on the single inputs of the corresponding triggers 3 of register 2. The outputs of these triggers are set to single signals that go to the corresponding information inputs of the register 4 and to the first inputs of the corresponding elements EXCLUSIVE OR 9 block 8 comparison. The information from register 2 will be overwritten into register 4 only after starting the distributor for 14 pulses. Therefore, the elements EXCLUSIVE OR 9, corresponding to the 1st and nth sensor, are triggered, since the first inputs receive single signals, and their second inputs receive zero signals from the outputs of the corresponding triggers 5 of register 4. At the outputs of the indicated elements of block 8 comparisons appear single signals, indicating a change in input information. These single signals through the element OR 10 affect the single input of the RS flip-flop 11. The latter is switched to the single state, as a result of which a single service request signal is output to the device output 15, and a zero signal appears at the output of the HE element 13. In response to a request signal, the external device, if it is ready, issues a pulse polling signal, which is fed to the control input 16 of this device. This signal triggers the pulse distributor 14, which at its first cycle of operation generates a single recording signal at its first output. This signal, arriving at the synchronization input of register 4, records information stored in register 2 into it. As a result, the corresponding triggers 5 of register 4 are switched to a single state and single signals appear at their outputs. Since thereafter, identical signals will act on all inputs of the comparison unit 8, single signals change to zero at its outputs. At the output of the element OR 10, the unit signal also changes to zero, but the trigger 10 still remains in the unit state. Further, on the second cycle of operation of the distributor 14 pulses on its second

0 output is allocated a single pulse signal, which is fed to the second input of the block of elements AND 6. As a result, single pulsed signals are formed at the corresponding outputs of this block, which arrive at the outputs 7 of the device. Thus, a parallel code is output to the device outputs 7, each position of which carries information from a respective sensor. In the case in question, this code has the form 100 ... 1, which corresponds to the availability of information from the 1st and nth sensors. The external device (computer) receives the specified data, determines the state in which the parameters of the object being monitored are located. In the third cycle of operation of the pulse distributor 14, a single pulse signal appears at its third output, which arrives at the zero input of the trigger 11. If by this time the input information has not changed, which corresponds to the presence of a zero signal at the single input of the trigger 11, the latter is reset to zero state. Therefore, a single request signal from output 15 is removed, and at the output of the element HE 13, the zero signal changes to unity. The latter confirms the zero state of all the triggers 3, except for the triggers 3, whose single inputs from the I-th and n-th sensors are single signals. In this case, none of the elements EXCLUSIVE OR 9 of block 8 of the comparison does not work, because

The 0 information of the previous state of the sensors, stored in register 4, corresponds to the current information contained in register 2. At the end of the signal at the third output of the distributor 14 pulses, the latter comes to its original state.

If during the time of issuing information about the state of the sensors there is a change in the state of the monitored sensors, then the operation of this device will proceed as follows.

0 Suppose that at the above-mentioned time point at the input of the device, a single signal from the 2nd sensor was received on the device, and single signals from the 1st and nth sensors were saved. In this case, at the time of action on the zero input of the trigger 11

5 a single pulse from the third output of the pulse distributor 14 from the output 15 a single request signal is detected. In this case, the zero signal at the output of the element HE 13 is preserved because the single input of the RS flip-flop 11 still has a single signal from the output of the element OR 10. This is due to the fact that the information in the register 2 corresponds to the code 110. . ,, and the information in register 4 is code 100 ... 1. Therefore, due to non-identical information in the indicated registers, a single signal at the output of the element OR 10 is saved. At the end of a single pulse from the third output of the distributor 14, the pulse at the zero output of the trigger 11 is set to a zero signal, and a single request signal is again generated at the output 15 of the device. In response to the request signal, the external device outputs a polling pulse signal to the input 16 of this device. In the future, the operation of the device will proceed as described. In this case, a code 110 ... 1 is output to the device outputs 7. which corresponds to the availability of information from the 1st, 2nd and nth sensors. Suppose that during the issuance of information about the state of the sensors, single signals from the I-fo, 2nd and nth sensors were removed, and single signals from other sensors did not appear. Since by this time the information in register 4 will correspond to the information in register 2 (the code in these registers is 110 ... 1), then the outputs of comparison unit 8 are set to zero, and the single signal at the single input of trigger 11 changes to zero . Therefore, upon arrival at the zero input of the trigger 11 of a single pulse from the third output of the distributor 14 pulses, the specified trigger is briefly set to the zero state. In this case, a short unit signal is generated at the output of the element HE 13, which resets the triggers 3 of the register 2 into O, which was previously set to one, and from output 15 a single request signal is removed for a single pulse at the zero input of the trigger 11 At the same time, the duration of a single signal at the output of the NOT 13 element is equal to the time of propagation of the signal around the ring formed from register 2, block 8 comparing the element OR 10, trigger II and the element NOT 13. This is due to the fact that after resetting to Tra 2 information in register 4 will be saved as a previously issued code 110 ... 1. Therefore, the corresponding elements EXCLUSIVE OR 9 of the comparison unit 8 are triggered and single signals appear at their outputs, which leads to a change of the zero signal at the single input of the trigger 11 to a single signal, and at the output NOT 13 to the change of the single signal to zero. Upon completion of a single pulse at the zero input of the trigger 11, a zero signal is set at its zero output, and a single request signal is again generated at the device output 15. Then, upon receipt of a polling signal from an external device, the distributor of 14 pulses starts up. The recording signal, generated at the first output of the distributor 14, resets the register 4, since at this time zero signals are present at all its information inputs. As a result, the comparison unit 8 comes to the initial state, which leads to a change at the single input of the triggers AND the single signal to the zero (initial) one. The read signal generated at the second output of the distributor 14 is read out at the device output 7 of a zero code, which, if there is a single request signal at the device output 15, indicates that information from the 1st, 2nd and nth sensors disappears. By the appearance of a single pulse at the third output of the distributor 14, the trigger 11 is set to < RTI ID = 0.0 > < / RTI > and therefore a single request signal is removed from output 15. The device returns to its original state. Thus, the speed of the proposed device is determined by one cycle of operation of the distributor 14 pulses and does not depend on the number of sensors. The proposed device eliminates the possibility of issuing false information about the state of the sensors. All this allows to increase the speed and reliability of the results - monitoring of sensor states. In addition, in the device, in contrast to the known state information, it is output to the device outputs only when the input signals change in the form of single pulses, and not in the form of generation of pulses. Due to this, no special device is required to control the specified pulse generation, and when issuing information about the status of sensors to a common communication channel, for example, to a main line of a computer, it is possible to transmit data to this channel not only from this device, but also from other sources information. It follows from the above that a new set of features of the proposed device allows increasing the speed and reliability of the device. The technical and economic effect of the application of the proposed device is to increase the speed by simultaneously polling the state of the sensors and to increase the reliability of the monitoring results by eliminating the issuance of false information about the state of the sensors.

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Claims (1)

A PARAMETER CONTROL DEVICE comprising a first register connected by outputs to the first inputs of an AND block connected to outputs with information outputs of a device, characterized in that, in order to increase the speed and reliability of the device, a comparison block, an ILI element, a trigger, a first and second elements NOT, a pulse distributor and a second register connected by outputs to the corresponding information inputs of the first register and to the first inputs of the comparison unit connected by the second inputs to the corresponding outputs of the first register, and the outputs to the inputs of an OR element connected by the output to a single trigger input connected by an inverse output through the first element NOT with the control output of the device, direct output through the second element NOT - with the input of zeroing the second register, and the first, second and third outputs will distribute To pulses respectively connected to the control input of the first register to the second input of the AND element unit and to a zero input latch and the first and second inputs of the pulse distributor are connected respectively to the control and clock inputs.