SU744953A1 - Device for monitoring the sequence of alternation of asynchronous pulse signals - Google Patents

Description

This invention relates to electronics and can be used in discrete-action automation devices.

By bus. St. No. 491204, a device for controlling the sequence of alternating asynchronous pulse signals is known. - 1) th trigger and with zero input (i, +) th trigger, the outputs of all gates are connected to the inputs of the OR element, the output of which is connected to the input bus. The drawback of the device is the lack of control over the presence of spurious pulses that can enter the device simultaneously with the current pulse signals as a result of a failure or malfunction in the controlled circuit, i.e., a very wide functionality.

Zero and (gain is expansion

Fuctional.h device capabilities.

Objective a (1 is caused by the fact that

to control the sequence of alternating asynchronous pulse signals, containing input and output buses and triggers, single outputs of which are connected to one of the valve inputs, each (the input bus connected to another input of the i-Toro valve, with a single input (6 -1) -th trigger, the outputs of all valves are connected to the input of the element OR, the output of which is connected to the output bus, additional elements are introduced AND, additional element OR, element of the transponder, the first input of each additional element AND is connected to zero the output of each flip-flop, a second input of each additional gate AND is connected to each of the 1-input bus, the outputs of additional elements and are connected to

 the inputs of the additional element OR whose output is connected to the first input of the prohibition element, the second input of which is connected to the output of the element OR.

The drawing shows a diagram of the device.

2p The device contains input buses I - 4,

triggers 5-8 from first to t-Toro, elements AND 9-12, additional elements from first to i-Toro, elements I 13, elements OR 17 and 18, element 19, output bus 20.

The principle of operation of the device on the example of the i-th cell, controlling the alternation of three adjacent signals Xi-i, Xi,

In the initial state, the AND 9-12 elements connected to the single outputs of the triggers are turned off, and the elements 13-13-16 connected to the zero outputs of the triggers are turned on. When the advance signal Xi-i 1 arrives at the single input of the trigger, the trigger is set to the single state. The next signal Xi 1 passes through the element And connected to the unit output of the trigger, the element OR 17 to the input of the element of prohibition 19 and in the absence of a “logical unit on the prohibitory input of the logical element“ prohibit proc. The retarded adjacent signal Xi + 1 returns the trigger to the initial zero state.

When a given order of compliance with the alternation of all monitored signals and the absence of spurious, each of the monitored signals alternately through the corresponding element AND 9-12, elements OR 17, prohibition element 19 enters the output bus 20 of the device. As a result, a signal B of the form of a constant "logical unit is formed at the output of the device.

Obviously, in case of violation of a given order of alternation of monitored signals, or their absence, the output signal will be absent.

When spurious signals are sent to the buses 1-4, the triggers corresponding to these buses are in the zero state and allow the spurious signals to pass through the corresponding AND 13-16 elements, OR 18 element to the prohibiting entry of the inhibit element 19. As a result,

the signal will be absent, regardless of the presence of a signal on the second code of the inhibit logic element.

Thus, a sign of violation of a given sequence of alternation

controlled signals, consisting in a change in the directions of bypass, the absence of pulses, the presence of false pulses, is the presence on the output bus signal "logical zero.

The advantage of the proposed device

 It consists in wide functional possibilities that allow fixing practically all possible malfunctions arising in the output stages of the controlled circuit. Greater credibility

the control, achieved by introducing additional logic elements, allowing to control the presence of two or more signals on the input buses at the same time, will provide the economic effect of the use of this device.

Claims (1)

Invention Formula A device for controlling the sequence of alternating asynchronous pulse signals by aut. St. No. 491204, characterized in that, in order to expand the functionality, additional AND elements are introduced into it, add "1st OR element and prohibition element, with 0 the first t-Toro input of the additional AND element connected to the zero output of the first trigger, the second input Ki is the input bus, and the outputs of the additional elements AND are connected to the inputs of the additional element OR, the output of which is connected to the first input of the prohibition element, to the second input of which the output of the element OR is connected. i i Ill “. . i