SU1314331A1 - Device for entering information from two-position sensors - Google Patents

Abstract

The invention relates to automation and computer technology and can be used to input information from TWO POSITION sensors in data acquisition and processing devices. The aim of the invention is to increase the reliability of the input information. The goal is achieved by being able to poll sensors with a frequency varying geometrically. Sensors are combined in order of importance (frequency of operation) in the P groups; the most important groups of sensors are polled with a higher frequency. The device comprises a pulse generator, a counter, two triggers, a memory unit (RAM), a switch and an encoder (ROM). Using the encoder, it sets the sampling frequency of individual sensor groups. 2 ill., 1 tab. (L

Description

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The invention relates to automation and computing and can be used to enter information from dip sensors into information collection and processing devices.

The aim of the invention is to increase the reliability of the input information t

Figure 1 shows the functional diagram of the device; figure 2 is a graph of the frequency of the survey of sensors from the number of groups of sensors.

The device includes a pulse generator 1, the first element AND-NOT 2, the counter 3, the first element AND 4, the first trigger 5, the switch 6, the second 7 and the third 8 elements AND, the EXCLUSIVE OR element 9, the memory block 10, the second element AND- NOT I1, the second trigger 12, the encoder 13. In addition, in addition to figure 1 are designated: position 14 conditionally functional sensors, positions 15-19 inputs and outputs of the device.

The memory unit 10 is a random access memory, the state of the triggers of their memory cells is not determined after switching on the device. Therefore, the device has an initial setup mode, in which logical 0 is recorded in the memory cells of block 10. After the initial setup, the device switches to the sensor test mode.

The device works as follows.

In the initial installation mode, the device switches when a pulse of the initial installation arrives at its input 16. On this pulse, the trigger 5 is set to one, and the counter 3 is set to the zero state. Clock pulses from the generator 1 through the element AND-NOT 2, opened at the second input level from the output of the trigger 12, arrive at the counter 3, operating in the summation mode, and also through the element 4, to the synchronization input of the unit 10. At the information input and the input of the task of the mode of the block 10 is set to logical O - the write mode O in the cell of the account of the block 10 corresponding to the state of its address inputs. When making a record of O in the last cell of the block

12

10, at the output of the NANDI element, a negative polarity impulse is produced, which translates the trigger point 5 into the zero state. Device goes over

the polling mode of the sensors is determined by the information inputs of the switch 6. At the mode selection input of the block 0, 1 is set, the block 10 is switched to the read mode, and the information input of the block 10 receives the signal of the polled sensor. The same signal is fed to the information output of the device and to the first input of the EXCLUSIVE

OR 9, where it is compared with the content of the corresponding memory cell of the block 10. If they do not match, the output of the EX key element (ALS OR 9) a signal appears that translates

trigger 12 into one state, forming a device readiness signal. Logic O with inverted output trigger 12 prohibits the passage of clock pulses and the input

the synchronization of block 10 is set to a logical 1 signal, and the logical mode O (recording mode) is set at the mode select input. On the readiness signal, the computer reads the information state

go and address outputs of the device and

sends to the device record 5 an impulse according to which the information present at the information input of the block 10 is written into the corresponding memory cell and resets the trigger 12.

At the same time, the counting counter 3 is resolved and the reading mode of the block 10 is established. The device proceeds to

0 further polling sensors.

Sensors based on importance (switching frequency) are grouped into P groups. The weights of the counter 3 from O to (k-1) determine the number of sensors in each group P; and by means of which the sensors within the groups P are polled. Signals coming from a 1-bit coder 13 for higher address numbers

-50 switch inputs, determine the number of the corresponding polled sensor group P; i.e. The maximum number of groups of sensors is determined by the encoder's size 13 and is equal to

55 P 2. The data in the table reflect the contents of the encoder.

To interrogate groups of sensors with a frequency, decreasing, by its geometrical

31

progressions with respect to the group number, starting with the first one, it is necessary to compile an array of the contents of the encoder 13, which has (n + 1) .- a bit input and a 1-bit output.

For the zone of higher address bits, when (n + 1) bit is 1, which is determined by the state of flip-flop 5, the output information is equal to the input B) t, the contents of the encoder are determined by the information on the output of counter 3, i.e. sensors are polled at the same frequency. This is necessary at the initial moment of time when the initial information about the state of all sensors is recorded in memory block 10. When polling the last date I

A bit f in the last group 2, at the output of the element IS-NOT 11, a logical O signal appears, which translates the trigger 5 into the state of logical O and the signal from the output of which goes to (n + 1) bit of the encoder 13..

Then for the zone of the least significant bits, when (n +) the bit is zero, the contents of the encoder 13 at address n; must be numerically equal to the number of the first low-order bit of the binary number of the address, starting with a zero having a logical value of 1.

For example for the address 66, OOOlOOj

As stated at address 66, the content of the encoder 13 will be the lowest bit having a logical I value, is the second, i.e. A second group of sensors is interrogated.

The contents of the encoder 13 at 16-bit address is determined by the outcome of the table data with the number of groups of sensors ... I5.

The sampling frequency of the sensors is inversely proportional to the groups of sensors (figure 2). In accordance with the schedule in figure 2, the group of sensors from the first

on K-th has f, and from K-th

Rth f

survey

-

lower than. where

Yu

I HS

m is the total number of sensors; the sampling frequency of the sensors in a sequential survey.

The most important sensors, the survey of which is necessary to be conducted with a high frequency, combine groups from first to K, and less important ones - into groups

From K to P, and each sensor is polled through a group survey.

Claims (1)

01 ..- K Editor Y. Sereda FIG. g Compiled by A. Trunov Tehred M. Khodanych R / gulp damt / i // (oS Proofreader Order 2214/49 Circulation 673 Subscription VNYIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4