SU752811A1 - Counter checking device - Google Patents

Description

The invention relates to a technique for controlling digital measurement devices and can be used in digital measurement and analogue measurement devices as an embedded self-monitoring system. A device for controlling counters is known, containing counters having inputs for recording command numbers, AND elements and control circuits 1. The device’s lack of control for multi-bit counters is the large number of inputs for recording command numbers, but the multi-input elements I. Moreover, The known device does not use the capabilities of the display facilities under control, which leads to functional redundancy. It is also known that a meter check device contains a generator, an input bus, a control bus, an AND element, an OR-NOT multi-input element, and an N-bit counter, whose discharge contains a counting decade with two outputs and a two-IN or ANj signal whose output connected to the input of the counting decade, the first input is connected to the nepBEJM output of the counting decade of the previous one, the second input with the output of the AND element, the first input of the two-input OR-NOT element of the first discharge is connected to the input bus, the second outputs of the counting decades are connected to the inputs of the multiplicative govhodovogo element NOR is connected to the generator output. the first input of the element is And, whose second input is connected to the control bus, and the third input is connected to the output of the multi-input element OR NOT 2. By the start command sent via the control bus to one of the inputs of the AND element, such a device checks the counters by parallel filing, for the counting decades of pulses from the generator through the element AND and the elements OR — NOT counting decades. When the ninth pulse arrives at the inputs of the counting decades, a single logical signal appears at their outputs corresponding to digit 9, which through the multi-input element OR does NOT enter the input of the AND element, prohibiting further passage of the generator pulses to the inputs of counting decades. With good decades, the figure 9 is fixed on the display of each decade. If a decade is faulty and is slower than the others, the signals at the outputs corresponding to number 9 appear in good working decades, and a figure less than 9 is fixed on the display device of the bad decade. while in working decades, the number is 9. If any counting decade is faulty and counts faster than working days, then figure 9 is fixed on it before the working decades count to 9. In this case, the display device has a faulty deck. s fixed number 9, while serviceable decades - the figure is less than .9. In case there are several faulty decades, the number of different digits on the display devices of the decades increases.

A disadvantage of this device is the lack of control of the communication circuits between the counting decades and the counting circuit of the counting pulses at the input of the first decade.

The purpose of the invention is to expand the functionality of the device,

To achieve this goal, a meter verification device containing a generator, input busbar, control bus, first AND element, OR-NOT ,, multi-input element, and Mracr dny counter, each bit of which contains a counting decade with two outputs and a two-input OR-NOT element whose output is connected to the input of the counting decade, the first input is with the first output of the counting decade of the previous bit, the second input is the output of the first AND element, the first input of the two-input YLI-NE element of the first discharge is connected to the input bus, the second inputs etny decades are connected to the inputs of the multi-input element OR-NOT, the generator output; connected to the first input of the first element I, the second input of which is connected to the control bus, entered the RS trigger and the second element I, the first input of which is connected to the control bus, the second input to the generator output, the third input to the direct output of the RS trigger , the inverse output of which is connected to the third input of the first element AND, the output of the second element AND is connected to the input bus, the output of the multi-input element OR is NOT connected to the input S of the RS trigger.

The drawing shows a diagram of the device verification meters.

The device contains a generator 1, element AND 2, multi-input element OR-NOT 3, counting decades, ,,,, elements OR-NOT -, RS-flip-flop 6, element AND 7, input bus 8, bus 9 control

which is connected to the first inputs of the elements 2, 7, the second inputs of which are connected to the output of the generator 1 and the third inputs are connected respectively to the inverse and direct outputs of the RS flip-flop b, the S input of which is connected to the output of the multi-input element OR NOT 3, the inputs of which connected respectively to the first outputs of counting decades, the inputs of which are connected respectively to the outputs of the elements OR — NOT — the first inputs of which are connected to the output of the element AND 2, the second inputs of the elements OR — NOT — are connected respectively to the second outputs of the counting decades, the second stroke element NOR is connected to the output of the AND 7 and 8 with an input bus ..

The device works as follows.

Before starting the meter check, the device is in the initial state. With the RS flip-flop b on the input element I 2, the resolution goes, and the input of the element 7 does not allow pulses to pass from the generator 1, there is no control signal on the bus 9, the pulses of the generator 1 through the elements 2 and 7 do not pass The counting decades are in the initial state, the output of the multi-input-element OR-NOT 3 signals is also absent. When the enable signal arrives on the control bus 9, the input element And 2 generator 1 pulses through the element AND 2, elements OR NOT - arrive in parallel to the inputs of the counting decades, When the inputs to the decades of the ninth pulse at the first outputs (corresponding to digit 9) are counting Decades, there are single signals that are combined by the multi-input element OR-NOT 3, and from the output of the latter the signal arrives at the input of the Trigger B, switching it to one state.

After switching the RS-flip-flop b, the further passage of the pulses of the generator 1 through the element AND 2 to the inputs of the counting decades is terminated. The failure of the decades is detected by the same features as in the known device, i.e. with a good counting on the display devices of all decades, the figure 9 should be fixed, and in the presence of faulty decades, other numbers can be recorded on the display devices of the decades.

After on all devices displaying the decades, the number 9 is fixed (with working decades), the second start command is sent to the device control bus 9. In this case, the pulses of the generator 1 through the element And 7 are fed to the input bus 8 and further

through the element OR NOT - to the input of the decade. The state of the counting decades is determined by the number of impulses received at the input of the counter during the enable signal acting on the device control bus 9. So, if the duration of the enabling signal is such that one pulse arrives at the counter input, then the first counting decade returns to its original state, and a second overflow signal appears at the second output / which through the OR-NOT element enters the second counting decade, which also returns to its original state, etc. Thus, if the circuit of the input counting pulses and the connections between all the counting decades all returned to the initial state, the O figure is fixed on the display devices of all the decades of the counter. If there is no connection between any two counting decades, then all subsequent The decades remain intact and the numbers 9 remain fixed on their display devices. If the duration of the enabling signal on the control bus 9 of the device is such that during this signal the counter input does not arrive how many pulses, then the first pulse all the counting decades return to the initial state, and the subsequent pulses are fixed in the counting decades of the least significant bits. In this case, the digits O are fixed on the display devices of the higher bits, and for the smaller bits the number of pulses arriving at the input is recorded. Thus, the health of the communication circuits between

Counting Decades and Counting Entries

pulse counter.

Claims (2)

Invention Formula A meter check device containing a generator, an input bus, a control bus, the first element AND, a multi-input element OR-NOT and a small counter, each bit of which contains a counting decade with two outputs and a two-input element OR-NOT, the output of which is connected to the input of the counting decade The first input is with the first output of the counting decade of the previous bit, the second one. the input is with the output of the first element AND, the first input of the two-input element OR NOT of the first digit is connected to 5 ecodic bus, the second outputs of the counting decades are connected to the inputs (of the input input element OR NOT, the generator output is connected to the first input of the first element AND, the second The input 0 of which is connected to the control bus is different. In order to expand the functionality of the device, an RS trigger and a second one are entered into it. 5 And element, the first input of which is connected to the control bus, the second input - with the generator output, the third input - with the direct output of the RS trigger, the inverse output of which 0 is connected to the third input of the first element AND, the output of the second element AND is connected to the input bus, and the output of the multi-input element OR is NOT connected to the input S of the RS flip-flop. five Sources of information taken into account in the examination . 1. Japanese Patent No. 47-43990, Cl, 98191 D 92, 1972. 2. USSR author's certificate No. 497732, class, H 03 K 21/34, 1976 (prototype),