SU661808A2 - Counter operability checkup device - Google Patents

Description

(54) DEVICE FOR MONITORING THE OPERATION OF THE COUNTER

Claims (1)

The invention relates to the field of instrumentation and computing technology. According to the main author. St. No. 355746 a device is known for controlling the operability of the counter, which contains the OR element connected through differentiating chains to the outputs of the meter triggers, the control triggers and the inequality element, one of the control triggers on the counter input is connected to the output of the OR element, the other to the meter input, and the outputs of the trigger elements The control is connected to the inputs of the inequality element. The disadvantage of such a device is that in continuous counting mode it is impossible to unambiguously determine both a failure and a failure in a controlled counter, since the counter is controlled during the counting process when one of the counter triggers is switched to one state. The purpose of the invention is to expand the functionality of the device by detecting failures and failures in the continuous counting mode. The goal is achieved by the fact that the device for controlling the operability of the counter, contains the OR element connected through differentiating chains to the outputs of the meter triggers, the control triggers and the inequality element, in which one of the control triggers on the counting input is connected to the output of the OR element, the other to the input the counter, and the outputs of the control triggers are connected to the inputs of the inequality element, an additional differentiating chain and the OR element are introduced. The input of the additional differentiating chain is connected to the transfer output of the higher-order trigger, and the output is connected to the additional input of the OR element and to the first input of the additional OR element, the second input of which is connected to the reset width, and the output to the installation input of the trigger control. FIG. 1 shows a block diagram of the device, FIG. 2 - time diagram of his work. The device for controlling the operability of the counter 1 contains differentiating chains 2-6, the elements OR 7-8, the control triggers 9-10 and the inequality element 11. -. The number of differential chains is determined by the number of bits g in the controlled counter plus one differentiating chain associated with the output of the transfer of the triggered bits of the Gerastral discharge. Thus, in the counter n + 1 differentiating chains can be used. The input of the controlled counter I is connected to the counting input of the trigger 9, the inverse outputs of the trigger 1 are connected to differentiating chains 2-5, and the direct output of the high trigger of the counter is connected to the differentiating chain 6, the output of which is connected to one of the inputs An additional element OR 8, another input of which is connected to the reset bus, and the output is connected to the control trigger setter 9. The outputs of the differentiating chains 2-6 are connected / to the inputs of the element OR 7, whose output is with & with the counting input of another trigger control 10, and the right outputs of the trigger controls 9-10 are connected to the input of the inequality element 11. The device operates as follows. Prior to the arrival of pulses to be counted, counter 1 and control triggers 9-10 are set to their original state, for which a corresponding signal is sent to the setup input. When applying counting pulses to the input of the counter, the first IM. Ls PeRuSCh its trigger — the first-time Gerger to the state 1, with one half of the trigger closed, and the other opened. Thus, the binary number 0001 is recorded on the counter. When the next pulse is applied, the second switch of the second bit triggers and the number of 0.010 is recorded on the counter. The counting process continues until the binary number — 1111 — is fixed in the counter. When the next pulse arrives: the outgoing counter triggers are switched to the zero state. At the same time, the signal generated by the differentiating chain 6 is given through the OR element 8 to the set input of the control trigger 9, which confirms the state About the control trigger 9. At the same time, this signal through the element OR 7 sets the control trigger 10 to the state O. Thus, from the output of the element OR off the signals, both in the case of switching the counter triggers from the state “O to one”, and in the case of switching the high-order trigger from state “1 to state” O. In the counting process, the output signal also acts on the control trigger 9, therefore, the latter switches in the same sequence as the first discharge trigger of counter 1, i.e. the control trigger 9 and the first discharge trigger of counter 1 coincide in time (Fig. 2, out. 9). From the output of differentiating chains 2 6, the signals arrive at the element OR 7, from the output of which (Fig. 2, Out. 7), the control trigger 10 is affected. In normal operation of the device, the control trigger 10 is thrown at the pulse frequency to counter 1. (Fig. 2, output 10), therefore, in the process of continuous counting, the states of the control triggers must match (Fig. 2, output 9 and 10), which is checked by element II (Fig. 2, output 11). If the counter fails (for example, on the output of the second bit trigger, a constant "1" is present) the output of the control trigger 10 permanently establishes a potential close to the potential of the power source and, although the control trigger 9 functions normally, the output of the unevenness element 11 there is a potential close to the potential of the power source. In the case of a short-term failure (malfunction), the normal operation of the control trigger 10 is interrupted, which leads to a temporary mismatch of the signals:: present at the inputs of the element 11. At the output of the device, in this case, a counter disturbance signal appears. Thus, the introduction of an additional differentiating chain and OR element into the device contol eliminates ambiguity in determining the correct functioning of the meter so in this case the device detects both failures and failures in the continuous counting mode, as well as failures leading to disconnection of triggers counter between clocks. The invention of the device for monitoring the operability of the counter on author. St. No. 355746, characterized by 4fo, in order to expand the functionality of the device by detecting failures and failures in the pulse counting mode, an additional differentiating chain and an OR element are introduced into it, and the input of the additional differentiating chain is broken with the start transfer output of the starSHET circuit, and the output is with the additional input of the OR element and with the first input of the additional OR element, the second input of which is connected to the bus “reset. and the input is the setup input of the trigger control. i L 3 TJ U U LJ U U UIJUUULIUUUU Lj lj Lj IJUUUUUUUL UTJTTLJ U U ITT JLJULJLJL JLJ-L L Sbix g  y y y  3 Tg t g  USF .1 id LJ S LJ r t t t