SU785839A1 - Common time system - Google Patents

Description

The invention relates to the field of electronic timekeeping and can be used in radio electronics, measurement technology and automation for building chronometric systems with the transfer of the current time from the primary clock to the secondary clock in a coded form. A device for transmitting temporal information is known, which contains a primary clock connected by a communication line with a secondary clock p. . The primary clocks broadcast periodically once per second (or more often) the current time code to the Egoric clocks, in which this code is fully memorized and displayed on python indicators. The described system does not remain operable when the wire line is broken, which is a significant disadvantage. The closest in technical eskoy. The essence of the described invention is a single time system consisting of primary clocks containing a time base wired link and. connected to her secondary clock G21. This system & no time has the following disadvantages. In order to ensure system operability when a wire line is broken, two sets of primary clocks are needed, and for them. strict synchronization requires an additional synchronization device - all JSTO reduces the reliability of the system for a single time. The aim of the invention is to raise the fossil of the system. To achieve this goal, two power keys and a trigger with a counting input are entered into the unified time system, and the AND circuit, the OR circuit, the control secondary clock, and the audible signal circuit are connected to the communication line, and the primary clock time information output is connected with the combined first inputs of the power switches, the second inputs of which are connected respectively to the direct and inverse outputs of the trigger, the counting input of which is connected to the cycle output of the set clock of the primary clock, output One power switch is connected to the beginning of the link, and the output of the other is connected to the end, while the information inputs of the AND circuits are connected to the outputs of the first and second power switches, and the control inputs of the AND circuits are connected to the second inputs of the cooTBeTCTseHi but the second and first keys, outputs circuits AND through the OR circuit are connected to the control secondary clock and the zvuzsovy signaling circuit.

The invention is illustrated in the drawing, which shows a diagram of a single time system.

The unified time system contains primary clock 1, power switches 2 and 3, trigger 4 with counting input, wired communication line 5, secondary clock 6, circuits AND 7 and 8, circuit OR 9, control secondary clock 1.0 and tt beeper .

In the unified time system, the information output of the primary clock I is connected to the combined first inputs of the power switches 2 and 3 whose second inputs are connected to the forward and inverse outputs of the trigger 4, the counting input of which is connected to the cycle output of the primary clock t, and the output of the power switch 2 via a wired one line 5 is connected to the output of the power switch 3, with the secondary clock 6 adjoining

Dineny to the communication line 5. The outputs of the circuits And 7 and 8 through the circuit OR 9 are connected to the control secondary clock S and the circuit 11 of the audible alarms, and the information inputs of the circuits And 7 and 8 are connected respectively to the outputs of blocks 2 and 3, and the control inputs Circuits And 7 and 8 are connected to the second inputs of power switches 3 and 2, respectively. A single time system works

in the following way.

The primary clock 1 forms the time scale and converts it into a serial digital code. The transmission of the time code to the secondary clock may be carried out in various ways, for example, such as those described at the beginning of this description. For the sake of simplicity, let us choose a method for transmitting a time code that is transmitted to the secondary clock twice a second. Moreover, the transfer is carried out by a six-digit current time scale, i.e. hours, minutes and seconds. Each value of the decimal digit is encoded by video pulses by known methods, and the entire code is transmitted by an array of pulses, the next two times per second with a high duty cycle. These pulses are taken from the information output of the primary clock I.

In addition, the primary clock I generates signals (pulses) that follow in time before the array of pulses of time (or after), which is of no fundamental importance and with the same frequency (in our case 2 times per second). These pulses will be called cyclic pulses, which indicate the beginning (or end) of the transmission of the time code, and they are removed from the cyclic output of the primary clock I.

Cycle pulses from the primary clock

1, they arrive at the counting input of the trigger 4, which under their influence passes from one state to another. In this case, the signals from its direct and inverse outputs periodically open the key 2, then 3. As a result, through the power keys

2k 3 alternately pass the time code pulses taken from the information output of the primary clock 1. Thus, the wired communication line 5 is alternately transmitted to the ends of the time code pulses of the time code, which are perceived by the secondary clock 6. For normal operation of the system, with a public key of 2 (or 3), the output resistance of the key closed at that time, 3 (or 2) was large enough not to create additional losses of the useful code signal (or this resistance was comparable to the input resistance of the secondary .h 6).

With a healthy link 5, the secondary clock 6 / pulse code combinations arrive at a frequency of 2 Hz, which are memorized by them and converted into digitizer () by indicators.

In the event of a link break 5 in any one place, the power switches 2 and 3 will give a time code pulse each in its own line segment to the break point. As a result, the secondary clock 6 will receive an array of code pulses with a frequency of 1 Hz, i.e. two times lower than when the line 5 is operational. At the same time, the indication by the secondary clock 6 of the current time is not violated, since the information on them comes from the line O with the frequency of changing values

the spGMemi scales are younger, i.e. once a second.

Thus, in order to maintain system performance when a wiring is interrupted in any one place, it is necessary that the frequency of cyclic transmission of a time code with an initial clock be at least two hours higher than the frequency of changing the low-order code. current time; otherwise, if the line is broken, the secondary clock will skip one value of the current time in the lower order.

In order to detect a break in the line, schemes 7 ... 11 are used. When there is no interruption in the wired communication line 5, the current time code through the public key 2 (or 3) via communication lines 5 through the open circuit AND 8 (or 7) and through the OR circuit 9 enters the control secondary clock U to the circuit II alarms. In this secondary clock.

10vidiziruyut current time, and the scheme

11sonic signals do not issue. When the link is broken, the current time code is through AND schemes on the screen & OR 9

does not arrive, because the chain - public key 2 (or H), the broken line 5 and the open circuit AND 8 (or 9) is broken, In this case, the indication on the control secondary clock goes out, and the circuit 11 generates a sound signal a link break 5.

The use of new elements: two power clusters, a trigger with a counting input, two AND schemes, an OR scheme, a control secondary clock, and an audible alarm scheme — allows the system to remain operational when the connection is broken and inform the primary clock personnel

about this malfunction that the reliability of the system and the whole.

Claims (2)

1. USSR author's certificate No. 332418, cl. GO4 C 11 / O4, 1972. 2. Shpolnsky V. А. Systems of a single time and their application in science. technology. TSNIITEI instrumentation,. with. 25-28 (npoTOTjm). "Vb