RU1775049C - Data input device - Google Patents

Abstract

The invention relates to automation and computer technology and can be used to input computer information from analog sensors, has advanced functionality. The device for inputting information contains analog channels, a switch, an analog-to-digital converter (ADC), the output of which is an output of a device for entering information, a control device for a switch and an ADC, a sensor type determination unit A sensor type determination unit consists of a buffer register, first, second and the third group of analog keys, resistor divider, measuring amplifier. The control outputs of the buffer register are connected to the control inputs of the analog key groups The analog input of the sensor type determination unit is connected by the first group of analog keys directly to the input of the measuring amplifier, the second group of keys through the resistor divider also to the input of the measuring amplifier, and the third group of keys to the output of the measuring amplifier an amplifier. The address inputs of the buffer register are connected to the information input of the device for inputting information, the output of the switch is connected to the analog inputs of the unit, determining the type of sensor, the analog output of which is connected to the input of the ADC 2 or

Description

The invention relates to automation and computer engineering and can be used to input information from analog sensors into a computer

A device for inputting information from analog sensors is known, comprising a multiplexer, an analog-to-digital converter, a memory unit, a firmware control unit, two counters; two registers and four switches.

Closest to the claimed is a device for inputting information comprising a switch, an analog-to-digital converter and a first second and third

counters, the outputs of the first counter are connected to the address inputs of the switch, the output of which is connected to the information input of an analog-to-digital converter, the outputs of which are information outputs of the device, the information inputs of the switch are information inputs of the first group of the device. The device also contains a control unit, a comparison unit, first and second registers, the outputs of the first register being connected to the installation inputs of the first counter, the outputs of which are connected to the inputs of the first group

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comparison unit, the output of which is connected to the first input of the control unit, the first output of which is connected to the ADC start input, the output of the conversion end of which is connected to the clock input of the first counter and the second input of the control unit, the second and third outputs of which are respectively the outputs of the end of the exchange and request devices, the fourth output of the control unit is connected to the clock inputs of the second and third counters, the output of the second counter is connected to the third input of the control unit, the fifth output of which is connected to the irrigation input of the first counter, the installation inputs of the second and third counters are combined with the inputs of the registers and are information inputs of the second group of the device, the outputs of the second register are connected to the inputs of the second group of the comparison unit, the outputs of the third counter are the address outputs of the device, the fourth and fifth inputs of the control unit are respectively the inputs of the start and end of the recording device.

A disadvantage of the known device for inputting information is that it does not allow varying the connection of various types of electrical sensors to any of the inputs of the device, which, in turn, makes the known device non-universal. In addition, this affects the time spent on reprogramming the sensor polling,

The aim of the invention is to increase versatility, which allows the connection of various types of electrical sensors to any of their inputs. This also reduces the reprogramming time associated with changes in the connection of various types of sensors. The device can be used in various technological processes with independent connection of various sensors to any of the information inputs.

The essence of the invention is that a sensor type determination unit is introduced into the device according to AS, USSR 1386986, the group of information inputs of which is connected to the outputs of the switch, the group of address inputs - with the group of information inputs of the device, and the group of outputs - with information inputs multichannel analog-to-digital converter, the sensor type determination unit is made on the buffer register, the information inputs of which are connected to the group of address inputs of the unit, the resistor divider, the first, second and third groups of oga-

output keys and an amplifier block, the group of outputs of which is a group of outputs of the block, the group of inputs of the amplifier block is connected to the group of outputs of the analog keys of the first and second groups, the control inputs of which are connected to the corresponding outputs of the buffer register, the group of outputs of the analog keys of the third group is connected to the group information outputs of the device, and control inputs - to the corresponding output of the buffer register, information inputs of analog keys of the first and third groups are connected to the information group unit inputs, directly, and the information inputs of the second group through a resistor divider.

Figure 1 presents the electrical circuit of the input device; Fig. 2 is an electrical diagram of a sensor type recognition unit;

The information input device comprises analog channels 1, a switch 2, an analog-to-digital converter (ADC) 3, the output of which is the output of the information input device. The device has a control device 4 of the switch and the ADC and a sensor type determination unit 5; The control device 4 consists of a first counter 6; first register 7, second register 8, comparison unit 9, information inputs 10 of the device, second 11 and third 12 counters, address outputs 13, control unit 14, information outputs 15, input 16 of the start of the control unit, output 17 of the request, output 18 of the end of the exchange output 19 of the end of the recording, the third 20, the second 21 and the first 22 inputs of the control unit, the first 23, fourth 24 and fifth of the 25 outputs of the control unit. The sensor type determination unit 5 consists of a buffer register 26, a first 27, a second 28 and a third 29 groups of analog keys, a resistor divider 30, a measuring amplifier 31. The control outputs of the buffer register 26 are connected to the control inputs of the analog key groups 27,28 , 29. The first 27 and third 29 of the key group contain two keys, and the second group 28 contains three keys. The number of keys in each group is determined by the number of switched circuits. The group of information inputs 32 of block 5 is connected to the first group of analog keys 27 directly to the input of the measuring amplifier 31; the second group of keys 28 through the resistor divider 30 to the group of inputs of the measuring amplifier 31, and the third group of keys 29 to the output of the measuring amplifier 31. The group of address inputs 34 of the buffer register 26 is connected to the group of information inputs 10 of the information input device. The output of the switch 2 is connected to the group of information inputs 32 of block 5, and the group of information outputs 33 of block 5 is connected to the information inputs of a multi-channel ADC. The information inputs of the analog keys of the first and third groups are connected directly to the group of information inputs of the block, and the information inputs of the second group are connected through a resistor divider.

The device operates as follows.

At the beginning, the counter 12 is loaded at the information inputs 10 from the computer with the starting address of the RAM array, where the measurement results are transmitted in direct access mode. Then, the computer loads the counter 11 at input 10 by a number in an additional code that determines the total number of measurements. Next, the computer sends to the information inputs 10 of the device a code of the initial analog input, which is recorded in register 7 and a code of the final analog input, which is written in register 8, as well as the operating mode code of the sensor type determination unit 5, while the device is ready for operation.

The computer starts the measurement with a start signal through the input 16 of the control unit 14 and causes the contents of register 7 to be written to the first counter 6. In addition, the start signal with the help of the control unit 14 generates a delayed conversion start signal, which is transmitted to the ADC 3. The delay value is determined by the time necessary for switching the analog signal, the address of which is set by the first counter 6, A / D conversion is performed. Upon completion of its ADC 3 generates a signal of the end of the conversion, fed to the clock input of the first counter 6, increases its content by one, and thus, the switch 2 selects the next analog channel 1. In addition, the signal of the end of the conversion is also fed to the input 21 of block 4 management. As a result, a request to the computer for direct access to the memory is set at the output 17 of the device. At the same time, the end-of-conversion signal triggers analog-to-digital conversion at the next input.

The computer, having received a request to enter data in direct access mode, reads from the device outputs 13 from the counter 12 the address of the memory cell and writes the result of the analog-to-digital conversion to it, which is output from the ADC 3 to the outputs 15. After writing the result to the memory from the computer, the signal of the end of recording is input to the input 19 of the device, which in block 14 generates an increment pulse for the second 11 and third 12 counters, preparing the address of the next cell in the computer memory array.

The operation is repeated until the counter 11 is overflowed, the signal of which is fed to the input 20 of block 14. As a result, the output of the end of exchange signal appears at output 18.

In sensor type detection mode, a full cyclic poll is performed

all analog inputs. In this mode, analog switches 27 are turned on from the computer at the information input 10. When the keys 27 are closed, thermoEMF sensors are detected, which supply the inputs of the measuring amplifier 31 with a voltage equal to units or tens of units of millivolts. On the group of outputs 33, a certain voltage is established proportional to the input and depending on

gain factor. All other types of sensors will give on the group of outputs 33 the maximum voltage value close to the supply voltage of the amplifier 31. With the keys 28 closed, the

sensors with normalized electrical outputs 0-5 mA and 0 - 10 mV. In that . In this case, the signal from the sensors enters the inputs of the measuring amplifier 31 through a resistor divider 30. Sensors with an output

0-5 mA set the maximum voltage value at the output group 33 of amplifier 31, 0-10 mV sensors set a certain average voltage value at the output, and thermoEMF sensors set the voltage close to zero.

The measurement results are transmitted from the output 15 of the ADCS to a computer and processed.

Upon completion of work in this mode, the information inputs 10 are supplied with a signal for the operation of analog keys 29, which turn off the sensor type determination unit 5 from the operation,

Claims (1)

SUMMARY OF THE INVENTION An information input device comprising a switch, an analog-to-digital converter, and first, second, and third counters, the outputs of the first counter are connected to the address inputs of the switch, the output of which is connected to the information input of the analog-to-digital converter, the outputs of which are information outputs devices, information inputs of the switch are information inputs of the first groups of the device, as well as a control unit, a comparison unit, first and second registers, the outputs of the first register being connected to the installation inputs of the first counter, the outputs of which are connected to the inputs of the first group of the comparison unit, the output of which is connected to the first input of the control unit, the first output of which is connected with the start input of an analog-to-digital converter, the output of the conversion end of which is connected to the clock input of the first counter and the second input of the control unit, the second and third outputs of which are respectively the outputs of the exchange end and the request of the device, the fourth output of the control unit is connected to the clock inputs of the second v-third counters, the output of the second counter is connected to the third input of the control unit, the fifth output of which is connected to the gate input of the first counter, the installation inputs of the second and third counters are combined with the inputs of the registers and are information inputs of this group of devices, the outputs of the second register are connected to the inputs of the second group of the comparison unit, the outputs of the third counter are device outputs, the fourth and fifth inputs of the control unit are respectively the inputs of the start and end of the recording device, characterized in that that, in order to increase universality, a sensor type determination unit is introduced into the device, the group of information inputs of which are connected to the outputs of the switch, the group of address inputs - with the group of information inputs of the device, and the group of outputs - with the information inputs of multi-channel analog-to-digital converters, the determination unit - type of sensors is made on the buffer register, the information inputs of which are connected to the group of address inputs of the resistor divider unit, the first, second and third groups of analog keys and an amplifier block, the output group of which is the group of outputs of the block, the group of inputs of the amplifier block is connected to the group of outputs of the analog keys of the first and second groups, the control inputs of which are connected to the corresponding outputs of the buffer register, the group of outputs of the analog keys of the third group is connected to the group of information device outputs, and control inputs - to the corresponding output of the buffer register, the information inputs of the analog keys of the first and third groups are connected to the group of information inputs a unit directly, and the second group of information inputs - via resistor divider. 3S tyt. 2