SU1238245A1 - Self-checking device for checking code - Google Patents

Abstract

The invention relates to computing, namely to devices for technical diagnostics discrete. devices of automation and computing. The device has enhanced functionality due to the fact that it allows controlling objects that have an output word code weight different from two, for example, 1 out of 4. The self-verifiable code control unit contains seven elements 1, 2, 3, 4, 8, 10 and 11 OR, five elements 5, 6, 7, 9, and 12 AND the first inputs of the first and third elements I, 3 OR and the second inputs of the second; and the fourth elements 2.4 OR are the corresponding outputs 13, 14, 15 and 16 of the device, and the outputs of the first and second elements 5, 6 AND, the seventh S element 11 OR, and the fifth element 1 2 AND are corresponding to you. moves 17, 18, 19 and 20 devices. At j outputs 17 and 18, code 2 of 4 is formed, and at outputs 19, 20, code 1 of 5 4. Gil. (Lt - yu

Description

The invention relates to computer technology, namely, to the means of technical diagnostics of automation elements and computer technology.

The purpose of the invention is to extend the functionality by providing control of code 1 of

The drawing shows the function .4

The scheme of the self-verifiable device, the code control system.

The device contains the first 1, second 2, third 3 and fourth 4 elements OR, first 5, second 6 .. and third 7 elements AND, fifth element 8 OR, fourth element 9 AND, sixth 10 and seventh 11 elements OR, fifth element 12 AND, the first inputs of the first 1 and third 3 elements OR, and the second inputs of the second 2 and fourth 4 elements OR are the first, second, third and fourth inputs 13, 14, 15 and 16 of the device, respectively, and the outputs of the first 5 and second 6 items. And, the seventh element 11 OR, and the fifth element 12 AND are the first, second, third and fourth outputs of the device 17, 18, 19 and 20, respectively.

1O

2O

3O

4O

8-O

9. 1 10.1 111

The device works as follows. . .

When checking code 2 out of 4, i.e. in the case of the presence of two units of four at the inputs 13,14, 15 and 16 of the device. In combination with codes 0101, ITO, 1001, 1010 as well as the health of the device itself, at outputs 17 and 18 the signals have opposite code values: 10 or 01 (self test condition). If the indicated input code is distorted, as well as in the event of a malfunction in the so-called device, the signals on the 17 and 18 canals are the same: 00 or 11.

When checking code 1 out of 4, i.e. in the case of the presence of one unit of. the four combinations of codes, 0001, 0010, 0100, and 1000) at the inputs 13, 14, 15, and 16 of the device, as well as when the device itself works, on the outputs 19 and 20 the signals also have opposite code values: 10 or 01. Otherwise case, the signals at the outputs 19, 20 are the same ;: 00 or M.

The table shows the operation of the device as .dl control code 2 of 4, and to control the code 1 of 4.

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As follows from the table, the sets of neck, one, seventh, tenth and eleventh correspond to the correct formation of code 2 from A, and the sets of the second, third, fifth and ninth ones to the correct formation of code 1 from 4. In the first case, the signals are formed on outputs 17 and 18, and in the second - at outputs .19 and 20 and have opposite values, which corresponds to the good condition of the control object. When code is distorted 2 of 4 or I of 4 at the corresponding outputs 17, 18, KJJH 19, 20 there are signals of the same value, which indicates the malfunction of the monitored ekta

or the control device itself.

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The same result is also caused by faults in the code control device itself, for example, the fault is constant 1 of the output of the first element 1 OR is fixed at the outputs 17, 18 and 19, 2; P, on the third, fifth, sixth, seventh and ninth sets. The fault constant O of the output of the fourth element 4 OR is fixed at the outputs 17 and 18 on the sixth and seventh sets, and on the outputs 19, 20 - on the second and fifth sets. Any single constant malfunction of the device at- BOFsfiT to the fact that either at the outputs of 55 17, 18, or at the outputs of 19, 20, or on all four outputs of 17, 18, 19, 20 of the device, the signals are identical.

45

50

one

eleven

1 1 I 1

0

0

five

five

0

Claims (1)

Invention Formula A self-checking code control device containing the first, second, third, fourth OR elements, first and second AND elements, the first input of the first OR element is combined with the first input of the second OR element and connected to the first input of the device, the first input of the third OR element is combined the first input of the fourth element OR is connected to the second input of the device, the second input of the second element OR is connected to the third input of the device, the second input of the fourth element OR is combined with the second input of the first OR element and connected to the fourth input of the device, the outputs of the first and third elements OR are connected respectively to the first and second inputs of the first element AND, the output of which is the first output of the device, the outputs of the second and fourth elements OR the connection to the first and second inputs of the second element AND, respectively. The second output of the device, characterized in that, in order to extend the functionality by providing control of code 1 of 4, the third AND element, the fifth OR element, the fourth AND element, w common and seventh elements OR and fifth element AND the first input of the third element AND is combined with the first $ 1238245ft input of the fifth element OR and the first input of the first element AND, the output input of the second element AND, and the second and fourth elements AND the first input combined with the second input, connected respectively with the first and fifth OR elements and the first input j with the second inputs of the seventh element of the ShZh, the first element AND, the first input whose output is the third output element AND is combined with the device's output, the outputs nth and vy input the OR element and the sixth OR element are connected by the corresponding second input of the second element AND, respectively with the first and second inputs of the second internal unit combined with the second input of the 10th element AND, the output of which is the sixth element OR and the second Quarter 1m output device.