SU962864A1 - Apparatus for central control of parameters - Google Patents

Description

 The invention relates to automation and information-measuring equipment and can be used in information-measuring systems (IMS) and information-computing complexes (CPI) of automated process control systems (ACS TP).

A device for centralized monitoring of parameters is known, which contains sensors, reference parameters adjusters and a unit for processing control results 1.

The disadvantage of this device is low accuracy due to errors introduced by the measuring channel.

The closest in technical essence to the present invention is a device for centralized control of parameters, comprising sensors, a source of reference parameters, functional converters, a switch, an analog-to-digital converter (ADC), the output of which is connected to the register of settings memory and the register of control results / control resultant control unit, control unit, display, recording and sound blocks

signings The device implements a compensation measurement method. By forming a setpoint using the measurement channel, the device compensates for the errors of this channel when comparing the value of the monitored parameter with the tolerance field. The total of the parameter is equal to the error of the source of standard parameters 2.

A disadvantage of the known device is that it does not control the insulation resistance of the sensors, the reduction of which leads to

15 to increase the measurement error of the parameters.

The purpose of the invention is to increase the completeness of the control.

This goal is achieved by

20 that the device for centrifuged control of parameters contains a transducer block and a control unit, the first output of which is connected through the setpoint adjuster to the first input of the switch, the second output to the second input of the switch, the third output to the first input of the first register, the fourth output to the first input of the second register, the fifth output - to the first input of the control results processing unit, the outputs of which are connected to the inputs of the registration, audible alarm and indication blocks, respectively, and the second and third moves - with the outputs of the first and second registers, respectively, the second inputs of which are connected to the output of the analog-digital converter, the switch input group is a group, device inputs, a sensor isolation control unit and a switch, whose input is connected to the sixth output of the control unit, output switch through a series-connected break contact of the switch and the converter block is connected to the input of the analog-digital converter, and the closing contact of the switch {1 to the input of the control isolation, the output of which is connected to the fourth input of the control results processing unit.

The control unit contains a serially connected master oscillator, a clock generator, a counter, a decoder and an element, the output of which is the third output of the block, a second output of the generator of clock pulses and the fourth output of the block, the third output with the first the input node of the elements And, the output of the counter is the second output of the block and is connected to the second input of the node of the elements and, the output of which is the fifth output of the block, supply line of positive potential through the variable The second resistor is connected to the zero potential bus and to the first input of the first indicator, and through the closing key to the sixth output of the unit and to the input of the second indicator, the movable contact of the variable resistor is connected to the second input of the first indicator and is the first input of the block.

The control results processing unit contains an element of comparison,

whose inputs are BTOpblM and

the third block inputs, respectively, the output is connected to the first input of the OR element, the second input of which is the fourth input of the block, and the output is connected to the first input of the valve assembly, the second input of which is the first input of the block, and the outputs of the OR element and node. block outputs.

FIG. 1 is a diagram of the device in FIG. 2 is a block diagram of converters; in fig. 3 is a diagram of the processing unit of the control results j in FIG. 4 is a control block diagram.

The device (Fig. 1) contains sensors 1, setpoint adjuster 2, switch 3, unit 4 of converters.

A / D converter 5, first and second registers 6 and 7, control results processing unit 8, registration blocks 9, 10 displays and 11 audible alarms, control switch 12, switch 13, its opening 14 and closing 15 contacts, insulating control block 16 , resistors 17-19, comparator 20.

In addition, the device contains

0 amplifier 21 and masilization unit 22 (Fig. 2); comparison element 23, OR element 24 and valve assembly 25 (FIG. 3); master oscillator 26, clock driver 27, counter 28, decoder 29, And element 30, And element node 31, the switching key 32, the first and second indicators 33 and 34, and a variable resistor 35 (Fig. 4).

0 The system of centralized control of parameters has two modes of operation - the mode of control of parameters and the mode of control of insulation. The mode is selected by block 12.

5 grams or manually, when setting the parameter control mode, block 12 issues commands to the setpoint adjuster 2, which forms the required tolerance field in the analog code. Values

The formed setpoint via switch 3, pin 15 and block 4 is post-. are fed to the input of analog-to-digital converter 5, measured and recorded in. register 6. Next, block 12 through switch 3, pin 15 and

5, converter 4 alternately connects sensors 1 to analog-to-digital converter 5, where a measurement takes place, the result of which is recorded in register 7. After each

0 measurement of the monitored parameter compares it with the previously measured tolerance field in block 8 and outputs the result to blocks 9-11. By forming a setpoint using the measurement channel in the system, the error of this channel is compensated for when comparing the monitored parameter with the tolerance field. The total error is equal to the error of the source of reference parameters, which, with the current development of technology, can be quite small with limited costs for most physical quantities.

When setting the isolation control mode, the switch 3 output will turn off. It is connected by pin 15 from the input of converter 5 and is connected to the config. tact 14 to the input unit 16. When decreasing. the insulation resistance of the sensor / connected by the switch to the block 16 and which is the fourth shoulder of the measuring bridge of this block, to a value less than permissible

 from the output of the comparator 20 comes

The decrease signal is generated by the block 8. In blocks 9-11, the fact of a decrease in the insulation is signaled and the address of the sensor in which the reduced insulation is detected is recorded.

Unit 4 may have a different technical implementation, depending on the type of sensor, the used area of its characteristics, etc. FIG. Figure 2 shows the layout of a group functional converter for the case when the sensors are thermoelectric thermometers (thermocouples). The block consists of the normalizing amplifier 21 and the scaling node L1. The unit works as follows.

  Subject to measurement of thermocouple emf through switch 3 of FIG. 1) is fed to the input of amplifier 21, where it is reduced to a normalized form. (O - 10V}. And then is fed to the input of block 22, where, in accordance with the calibration characteristic of the sensor, it is converted to a voltage, the value of which corresponds to the temperature dimension.

From the output of block 22, the signal is fed to the input of the converter 5 (figure 1)

.Block 8 works as follows. In the parameter control mode, the measurement result of sensor 1 parameter is set in the code to one of the inputs of element 23, to the other input of which the result code of the parameter of the setting device 2 is written in register 6. When the measurement result of the parameter of the monitored sensor exceeds the measurement result of the reference source parameter (setpoint) at the output of element 23, a deviation signal appears, which through the element OR 24 enters block 11 and opens vetil of node 25 for passing the code of the address of the monitored date incoming from block 12. The address code goes to the blocks, 9 registrations and 10 displays. In the isolation control mode, a deviation signal is generated at the output of the comparator 20 and is fed to the input of the OR element 24. The deviation signal passes through the OR 24 element and Next, the operation of the block is similar to that described above.

Thus, in the parameter monitoring mode, the registration blocks 9 and the indication from block 8 are supplied with the sensor code of the sensor, whose par- meter exceeds the setpoint, and in the control isolation mode, the code of the address of the sensor having broken insulation. The sound alarm unit 11 in both modes is given a deviation signal.

Block 12 works as follows. Pulses from the generator output 26

are fed to the input of the imager 27, which is, for example, a 5-bit shift register. The register zero is neutral. The first register state is. By the 1st clock, changing the state of the counter 28, the 2-ft clock is used as a synchronization clock to start up the analog-to-digital converter 5 (not shown).

0

The 3rd clock cycle from the shift register is fed to the input of the register record 7 to record in it the measurement result of the parameter of the monitored sensor. At the 4th cycle address code

5 monitored sensor from the counter 28 through the node elements And 31 is fed to the input unit 8 (Fig. 1). In addition, the address code of the sensor is supplied to the key management switch 3, as well as the inputs of the decoder 29,

0 at the output of which the initial state of the counter 28 is selected, at which the parameter of the setting device 2 is measured in the system (i.e. the setting is formed), wherein

5 3rd cycle from the output of the driver 27 through the element And 30 passes to the input of the register 6 (Fig. 1).

With key 32, the operator can apply a voltage to the winding of the relay, which is a switch 13. In this case, the device switches to isolation control mode, which is reflected on indicator 34.

If the sensors 1 in the system are thermoelectric thermometers (thermocouples), then a precision variable resistor 5 may be used as a source of reference parameters, the operator of which may have the desired setpoint, while the value of the resistor 35 is fixed by some (electrical, electromechanical, etc.) indicator 33 settings.

five

Distinctive features of the invention allow an increase in the completeness of the control to be achieved, since they provide the control of an additional parameter, the insulation resistance.

50

Claims (3)

1. A device for centralized control parameters, containing 55 converter unit and control unit, the first output of which is connected through the setpoint adjuster to the first input of the switch, the second output to the second input of the switch, 60 third OUTPUT - to the first input “of the first register, fourth exit to the first input of the second register, fifth exit - to the first. the input of the control results processing unit, whose outputs connected to the inputs of the registration, audible alarm and display units, respectively, and the second and third inputs to the outputs of the first and second registers, respectively, the second inputs of which are connected to the output of the analog-to-digital converter, the switch input group is a group of device inputs, characterized in that In order to increase the completeness of control, the device contains a block for isolating sensors and a switch, the input of which is connected to the sixth one, the output of the control unit, the switch output via a sequence A single contact of the switch and the converter unit is connected to the input of the analog-digital converter, and through the short contact of the switch to the input of the isolation control unit, the output of which is connected to the fourth input of the monitoring results processing unit 2. Device POP.1, characterized in that the control unit J5eni contains serially connected master oscillator / clock generator, counter, decoder and AND element, the code of which is the third output of the block, the second output of the clock former and connected to the second bypass of the AND element with the fourth output of the block, the third vy9 {od with the first input of the node. elements And, the output of the counter is the second output of the block and is connected to the second input of the node of elements I, the output of which is the fifth output of the block, the power supply bus of the positive potential is connected to the zero potential bus and to the first input of the first indicator via a variable resistor the sixth output of the unit and with the input of the second and 0 dicators, the movable contact of the variable resistor is connected to the second input of the first indicator and is the first input of the unit. 3. The device according to claim 1, in which 5, the control results processing unit contains a comparison element whose inputs are the second and third inputs of the block, respectively, the output is connected to the first input of the OR element, the second input of which is The fourth input of the unit, and the output is connected to the first input of the valve assembly, the second input of which is the first input of the block, the outputs of the OR element and the valve assembly are the corresponding outputs of the block. Sources of information taken into account in the examination D1 1. Tsapenko MP Measuring information systems. M., Energie, 1974, p. 206. 2. USSR author's certificate 607190, cl. G 05 23/02, 1975 (prototype).