SU1087963A1 - Device for checking transducers - Google Patents

Abstract

A SENSOR MONITORING DEVICE containing a switch whose information inputs are device inputs and an output connected to the first inputs of the first subtraction unit and a memory block, a control unit whose input is connected to the first input of the device, a block of threshold elements whose input is connected to the output of the first the subtraction unit, and the outputs with the first inputs of the registration unit, the setpoint generator, the output of which is connected to the second input of the first subtraction unit, and also the third threshold element, the output of which is connected to the second input A registration unit, characterized in that, in order to expand the functionality of the device, a second subtraction unit, a standby multivibrator unit and an AND element, whose output is connected to the third input of the registration unit, and inputs to the outputs of the standby multivibrator unit, whose input is connected, are introduced into it. to the output of the second subtraction unit, i the first input of which is connected to the output of the memory unit, the second input to the output (L of the switch, the outputs of the control unit are connected to the corresponding address inputs of the memory unit, comm Tatorey, setpoint, and the recording unit block monostable multivibrator. 00 CO O5 with

Description

The invention relates to automation and computer technology, which can be used in diagnostic and control systems, and the use of Flaiber is advisable to monitor sensors in control systems for rapid processes, for example, in rolling production.

A device for diagnostics of relay-contact circuits is known, which contains a reference unit, a comparison unit, an indication unit, a signal master, a delay unit with a kmmutator, galvanic isolators, memory nodes with electronic keys and inputs, a NOT element, connected to the output of the delay unit, connected to one of the inputs of the memory node spontaneously, and to the other - through the aforementioned element NOT 1.

The scope of this device is limited, since it is designed for diagnostics of relay-contact circuits and, moreover, the need for each step of alternately connecting the monitored sets to the comparison unit does not allow to evaluate the state of the whole system at any given time.

A device for diagnosing control systems is known, which includes a clock shaping unit, a code converter, a de-jitter, a first OR element, a distributor and a second OR element, and a third OR element, a first key and a time relay connected by an output to the first inputs of the registration blocks and display, a NOT element, a memory element, a second key and a pulse shaper, the output of which is connected to the time relay input, the first input - to the output of the second OR element and to the control input of the decoder, and the second input - through the second key with the first input of the device and with the first input of the first element OR, connected by the second input through the first key with the second input of the device and through the memory element to the second input of the display unit, and the third inputs with the first outputs of the decoder, information inputs which are connected to the outputs of the code converter, and the second outputs are connected to the second inputs of the register unit, the first outputs of the distributor are connected to the inputs of the clock shaping unit, and the second output is connected to the third and NOT to the fourth input House display unit, moreover, the device comprises a diagnosable system unit forming a signal sequence received at the input system is diagnosed, the response analysis block of the system in the "active signal received at its inputs. In case of detection of a malfunction in the system being diagnosed, the nature of the malfunction and the place of its occurrence are indicated. In this case, in order to pass the control, it is necessary to submit an input effect to the input “Continuation of the control, and so on. | 2 |.

The disadvantage of this ycTpoiicTisa is a non-x (J The amount of disconnecting the diagnosed system from the process it controls to ensure that it is fed to its input, formed by the control unit.

The closest to the technical essence of the invention is a device for controlling obteektov, containing a switch connected to a control unit; 1е1П1Я, subtraction unit, the second input (.) Of which is connected to the receiver, the unit of threshold elements, the output of which is connected to the register, and the unit memory (3).

A disadvantage of the known device is that it lacks the ability to control the increment of each parameter for the i.k. 1 poll.

The aim of the invention is the expansion of functional capabilities of the device. The goal is achieved by the fact that, in a sensor control device containing a switch, the information inputs of which are device inputs, the output is connected to the first inputs of the first subtraction unit and the memory unit, the control unit whose input is connected to the first input of the device, a block of threshold elements, the input of which is connected to the output of the first b. subtractor, and P1) 1 inputs - with the first inputs of the registration unit, the setpoint generator, whose output is connected to the second input of the first subtraction unit, also the third threshold element, output D which is connected to the second input of the registration unit, the second subtraction unit is entered, the block is waiting for the multivibrator snks and the I element, the output of which is connected to the third input of the registration block, and the inputs to the outputs of the multivibrator waiting block whose output is connected to the output of the second subtraction unit, the first input of which is connected) to the output of the memory unit, the second input to the output of the switch, the outputs of the control unit are connected to the corresponding address inputs of the memory unit, the switch, the setting unit, the registration unit and the waiting multive bratorov.

In the drawing, a block diagram of the device.

The device contains sensors I, switch 2, the first Fychitki block 3, the first and second threshold elements -4 and 5, the setting unit 6, the control unit 7, the memory unit 8, the second unit 9 subtraction, the third threshold element 10, the unit 11 waiting multivibrators, the element And 12 and block 13 registration.

The device works with.

In real time scale in the process of functioning 11 oi-1 ooocktl, equipped with abBtomatiz s; n1I () T | control circuit, technological process is carried out by KOtiTpcMh of working capacity and, accordingly, sensor readings with which the object is equipped.

By changing the state of the nerve sensor, the control unit 7 is activated, which in turn connects the sensors through the switch 2 to the first subtraction unit 3. In block 3, the difference between the value of the signal from the sensors and from the setpoint generator b is formed.

If the received parameter does not correspond to the minimum value (it turns out to be a permissible value both in minimum and maximum), i.e.

,

where YJ is the current value of the parameter; jvi is respectively the minimum and

its maximum value

then in this case, through the threshold elements 4 and 5, respectively, a message and sensor faults are output to the registration unit 13 at the corresponding address.

The thresholds for triggering threshold elements are set in advance.

The second subtraction unit 9 allows monitoring the change in the absolute value of the parameter (i.e., the increment) at each control step.

For this, the memory unit 8 stores the parameter in the previous monitoring step.

The value of this parameter is compared with its value in the next step and, if its increment is 4 / large, the allowable value of the module, i.e.

1AU ,,

where K is a permissible value of the parameter increment, then the third threshold unit 10 generates a signal about the failure of this sensor, registering it with the registration unit 13 but corresponding to the address.

With the help of block 11 standby multivibrators and circuit 12, the sequence of "sensor triggering" as the product progresses along the production line (for example, is monitored).

bands of HpoKiiTijiBaoMoro mon. w. for the revenge of the installation of the nerve sensor on the installation of the last sensor, controlled by the data of YcTpoiicrnoM.

At the output of the circuit 12, a signal about a failure situation or a sensor failure is injected in the event that a given mate counter (). H in the device receives a signal at the desired time, at least from one of the monitored sensors, t. No signal is received from the second subtraction block 9, thus the function is realized here

) Ci-T {AdiCj-tj, A, ..., ctxn. l dx,

P

where (1з1: 1, -. Дх „- change of the signal of the first and last sensors on the controlled production line;

tij- - the value of the delay time of the signal by the amount of delay associated with the speed of the object through the process line. Inclusion in the control device of sensors in automated process control systems of the switch, memory unit, task block, BTOpoiO subtraction unit, AND circuit and standby multivibrator unit connected to each other and with the unit of the control unit by sensors of the control object, as well as with the threshold units and the control unit allowed to monitor both failures and sensor failures. Failure is a sensor state in which a signal is permanently absent or present. Failures - is the change in the duration of the signal, the delay, the error of the signal is more than permissible, the failure of logical conditions.

Thus, the implementation in the prelamaraMOM device of monitoring the absolute value of the parameter in real time the operation of the object, its increment and the sequence of changing the value of the parameters depending on the speed of advancement along the product line made it possible to dramatically increase the reliability of sensor monitoring compared to the known.

Claims (1)

A SENSOR CONTROL DEVICE, comprising a switch, information inputs of which are device inputs, and the output is connected to the first inputs of the first subtraction unit and memory block, a control unit whose input is connected to the first input of the device, a threshold element block, the input of which is connected to the output of the first the subtraction unit, and the outputs with the first inputs of the registration unit, the master, the output of which is connected to the second input of the first subtraction unit, and also the third threshold element, the output of which is connected to the second input of the unit registration, characterized in that, in order to expand the functionality of the device, a second subtraction unit, a standby multivibrator block and an AND element, the output of which is connected to the third input of the registration block, and the inputs to the outputs of the standby multivibrator block, the input of which is connected, are introduced into it to the output of the second subtraction unit, the first input of which is connected to the output <3 of the memory block, the second input is connected to the output of the switch, the outputs of the control unit are connected to the corresponding address inputs of the memory block, switch, The sensors, and the recording unit block monostable multivibrator. SU „, .1087963