SU858068A1 - Device for shaping logic signals of operator's reaction - Google Patents

Description

(34) DEVICE FOR THE FORMATION OF LOGICAL SIGNALS RESPONSE ACTIONS OF THE OPERATOR

The invention relates to automation and computing, in particular, to the formation of logical signals from switching elements (toggle buttons and the like) of an operator’s console and can be used in conjunction with the operation of mechanical contacts of controls with logic devices made on integrated circuits, for example in simulators for training operators of discrete control systems. When the switching elements of the operator console and logic devices containing various counters, registers, etc. are combined, it is necessary to transmit signals from the contacts of the mechanical switches. However, the operation of a mechanical switch is usually accompanied by contact bounce, which leads to the formation of an arbitrary series of pulses (i.e., unsteady signals) instead of a desired single pulse or potential drop (i.e., a steady state signal). when logic control units are executed on integrated circuits operating in the nanosecond range, and input signals come from mechanical contacts, the bounce duration of which can be l from ten to hundreds of milliseconds. In these cases, the formation of logical signals is necessary. Devices are known that are designed to generate logical signals from elements of the co7 "1mutation operator console, in which unsteady and steady-state signals from a mechanical contact are fed to the input of a parametric delay element, delaying these signals by discharging the capacitor capacitance by overlapping the contact bounce time, and then form a logical signal I1JH t2. However, these devices do not provide the required noise immunity and also have limited functionality due to the fact that there is a dependence of the logical signal on the contact jingling duration on the stability of the parameters of the delay elements, as well as limitations on the delay of the signal delay. In addition, the willow devices themselves provide changes in the hardenability of the gate when the contact closes relative to the delay when the contact is closed, and vice versa.

Closest to the invention is a device comprising an operator console with switching elements, a logic control device, such as a control unit, and a generator (3 J.

However, this device has insufficient noise immunity and limited functionality for BbimeyKasaHHtJM reasons.

The purpose of the invention is to demonstrate the accuracy of the device.

This goal is achieved by introducing two counters into a known device containing a generator, an operator response input bus and an output information bus, the first inputs of which are connected to the generator output, and the second inputs are connected to the operator response input bus, the output of one counter is connected with the third input of another counter connected to the output to the output information bus.

Improving the accuracy of the device is achieved by the fact that this device generates logical signals from the switching elements of the operator’s console, based on the use of pulses of the reference generator when transmitting unsteady and established signals from the contacts of the indicated elements, in which the transmitted signals from the contact of the switching element and pulses of the reference generator logically multiply and convert the frequency of the resulting pulses, affect the frequency conversion signals from ementa switching so that the whole range of action neustanovivshihs signals periodically stop frequency of the resulting pulse conversion and is performed in the return uc Khodnev state and continue to frequency conversion when exposed to a steady signal and the fixed end of said conversion thereby forming a logic signal

At the same time, the formation of a logical signal is independent of the time of the occurrence of unsteady signals, since the formation of a logical signal occurs at the actual end of the action of unsteady signals or interference, which significantly increases the noise immunity.

At the same time, this allows, by changing the delays in closing and opening up the contact, to somewhat expand the device's hardware capabilities.

In the drawing, a schematic of an isbrggykeg device for generating logical signals of response actions of an operator included in the simulator.

The device contains an operator’s console 1, a device 2 generating logical signals of the operator’s response actions with counters 3 and 4, with (holding the triggers of the younger 5 and senior 6 bits, and generator 7, and block 8 of the control.

Q Panel 1 contains the element 9 input answers, connected through the bus 10 input response operator with counters 3 and 4 (inputs 11 and 12, respectively). The counter 3 contains, in addition to the triggers b and 5, the elements AND 13, OR 14, the inverters 15 and 16, the element And 17. The counter 4 contains, in addition to the triggers 5 and 6, the element And 18.

In the drawing, reference numerals 19-23 denote the corresponding inputs and outputs of counters 3 and 4. Output 23 is the output information bus of device 2.

The proposed device works as follows.

5 When the operator acts on the monitored control unit of the console 1, the mechanical contact of the element 9 is closed. Owing to the chatter of the specified contact, a tire appears on the bus 10

Q unsteady signals representing an arbitrary series of pulses, in other words, an arbitrary sequence of alternating logical zeros and ones. This constant signal is fed to the input

11 counter 3 and the input 12 of the counter 4.

A single unsteady signal from input 11 is fed to one of the inputs of the element And 13, the other input of which receives the output signal

0 counter 3 with the inverse shoulder of the trigger 6 of the senior bit. The signal from the output of the element And 13 through the element OR 14 and the inverter 15 acts on the inputs of the zero setting of the flip-flops 5 and 6 of the counter 3, blocking the effect of the signal on the counting input of the trigger 5, coming from the output of the inverter 16 through the element And 17. The output signal of the counter 4 for the duration of a single unsteady signal does not change.

The zero unsteady signal (as well as the steady-state signal) from the first input 12 of counter 4 is fed to one input of the element 18 and directly to the inputs for setting zero of the flip-flops 5 and 6. At the same time, the output signal of the counter 3 does not change either.

To change the output values of both one and the other counters 3 and 4, it is necessary for the communication line to terminate the alternation of zero and single values of the input signal, and the input signal itself should receive one of the established values, i.e. zero or one.

At the end of the transition process after the closure of the contact element 9 on the bus 10 will be set to zero input signal. This signal through the inverter 16, acts on the first input element And 17, allowing the passage of the pulses of the generator 7 from the input 19 when

subject to the absence of a blocker

from the inverse output of the trigger 5 low-order bit, the output of which is fed to the counting input of the trigger 6 high-order bit of this counter. After the counter 3 is filled, for example with three pulses, the state of trigger 6 of the senior bit of counter 3 changes, the output signal from the right arm of trigger b from output 23 is transmitted to the input of block 8, and the output signal from the inverse arm of trigger 6 is received to the inputs of elements And 13 and 17, blocking further filling of the counter with 3 pulses of the generator 7 and zeroing with a single unsteady signal or a noise signal.

When the contact of the element 9 of the supervised control is opened, the unit 1 on the bus 10 will be set to a single value of the input signal. This steady-state signal arrives at one input of an AND 18 element, allowing the generator 7 pulses from the input 20 of counter 4 to pass through it. As in counter 3, after three pulses of the generator 7 are counted, the state of the trigger 6 changes in this counter, from the output 21 of the counter 4 is fed to the input 22 of the counter 3. This signal through the element OR 14 and the inverter 15 Triggers 5 and 6 of the counter 3 are zeroed, as a result of which the output signal of the counter 3 is reversed.

In subsequent cycles of closing (opening) the contact element 9, the device operates in a similar way.

The use of the proposed device in monitoring discrete operator actions in the case of a mechanical contact of a controlled control device to control units performed on integrated circuits allows obtaining a technical advantage by concluding a number of ways to improve noise immunity when generating logical signals from operator switching elements by using simplest logic UEs. counters, as well as in extending the functionality by providing gngshov varying over a wide range of delay when the contact length relative delay duration after opening of the contact, and by removing the restriction on the allowable value of the delay duration.

In addition, the signaling requirements of twisted pairs are eliminated, since they provide protection both from chatter and interference that can occur when transmitting a signal over a single-wire line,

5 which reduces the number of wires by half, the requirements for the dynamic characteristics of the signal from the mechanical contact are reduced, since this signal does not act directly

0 to the counting dynamic input of the counter, but only is used in the fixed value as a permitting signal of the reference impulses of the reference generator which fill additional counters and reduce the requirements for choosing the type of cable according to the allowable value of the distributed capacitance, because the requirements for the dynamic characteristics of the input signal are reduced.

Claims (3)

1. Gutiikov B.C. Integrated electronics in measuring devices. Energy J 1979, p. 109. five 2. Guidelines for the use of integrated circuits of the series K 155. RTM 141-74., 1974. p.3.2.10. 3. The author's certificate of the USSR 1 693425, cl. G 09 B 9/0 & 1976 (prototype).