SU1278849A1 - Device for servicing interrogations - Google Patents

Abstract

The invention relates to the field of computer technology and can be used in control controllers incorporated in automated control systems built on the basis of an ACU. The aim of the invention is to increase the reliability by eliminating the effect of short-term interference on the request inputs of the device with a duration sufficient to operate. triggers of queries and a failure of the communication channel with the U-WMA. The device contains triggers Zaprszoc, mask triggers, a group of elements OR, two groups. elements AND, two elements OR, three elements AND and two triggers, c (g 2 Il.

Description

The invention relates to computing technology and can be used in control controllers incorporated in automated control systems based on PCM,

The purpose of the invention is to increase the reliability of the device by eliminating the effect of short-term interference on the request inputs of the device.

FIG. 1 shows a block diagram of the device; in fig. 2 - timing diagrams for the operation of the device.

The device for servicing queries contains triggers 1 queries, triggers 2 masks, a group of elements OR 3, the first 4 and second 5 groups of elements AND, the first 6 and second 7 elements OR, the first 8, second 9 and third 10 elements AND, the first 11 and second 12 triggers, request inputs 13, inputs, Request serviced 14, mask setting inputs 15, reset input 16, information outputs 17, clock frequency input 18, Ready 19 output, the device for servicing requests operates as follows. The reset impulse is received from the controller by a controller from the controller to the device for servicing requests and prepares it for work with subscribers (diagrams a 16, Fig 2). gg1; On the leading edge of impedance reset triggers 1 queries and 2 masks, as well as the first 11 and second 12 triggers set. to the initial state (Fig. 2). Mask triggers 2 are prepared for operation by pre-set on inputs 15 signals (logical unit) corresponding to the expected signals from inputs 13 from subscribers. Requests from subscribers in the form of potentials-xx signals are received at inputs 13 to the corresponding bits of trigger 1 request, the number of bits of which is equal to the number of subscribers. Thus, at the corresponding inputs of the first group of And 4 elements, the signals coming from the flip-flops of 2 masks and 1 requests are matched. From the respective outputs of the first group of elements, And 4 signals are passed to the inputs of the second group of elements. Comrade I 5, preparing a code for outputting to device information outputs 17, and simultaneously to the inputs of the first element OR 6, from which the signals go to the first input of the first element AND 8, to the other input which receives signals from inputs 13 through the second element OR 7 .

When the signals coincide with the element I 8, a logical unit is taken from its output, which is fed to the first input of the second element I 9 and to the D input. the first trigger 11, which is triggered by the trailing edge of the clock frequency pulse.

Claims (1)

At the output of element 9, a logical unit appears. It enters the D input of the second trigger 12, which also triggers on the falling edge of the pulse of the gastric pulse, after which the logical unit is removed from the forward output of the second trigger 12, and output 19 A ready-to-go signal to the controlling controller reads the signals from the device data. With the inverse of the output of the second trigger 12 logical zero is supplied to the second input of the third element And 10 and thereby prohibits the arrival of pulses on the second; the inputs of the group of elements OR 3. In response to the Ready signal from output 19, the controlling controller begins processing the incoming control unit sequentially, the zero signal to the caller of the subscribers making the request, swaddled it, as a result of which the alarm 13 and the corresponding input the trigger 1 SSrOs becomes logical zero. After that, a signal is sent from the controlling controller to the corresponding input Request 5; : En 14, whereby the corresponding trigger request. B is reset to the initial zero state. When the subscriber service is completed, the control controller enters the Reset signal by which the / querying service device is reset to its original state. At the mask inputs, a new customer service code is set at the mask inputs and the new query service cycle is repeated. When interference appears at the inputs 13 (Fig. 2), the duration of which is less than the duration of two periods of the clock frequency, the corresponding trigger 1 of the requests is triggered. When the signals from the triggers 1 and 2 coincide, the output of the first group of elements AND 4 is a signal that through the first element OR 6 arrives at the input of the element AND B. When the signals at the inputs of the element. AND 8 coincide, its output appears logical unit. Trigger 11 triggers on the falling edge of the clock pulse and on the second element And 9 there is a coincidence of signals, but the signal duration from the output of the And 9 element is insufficient to trigger the second trigger 12, which triggers on the falling edge of the clock frequency and the level of the logical unit on D- the entrance. Thus, the signal to the Ready 19 output does not pass and the false information is not overwritten to the control controller. Claims An apparatus for servicing queries containing N query triggers (N is the number of queries), the first group of Eggs AND, the second group of And elements N of the mask triggers, the group of elements OR, the first elements of And, G1, and the D-inputs of the request triggers are connected to the request inputs of the device, direct outputs - to the first inputs of the corresponding AND elements of the first group, connected by the second inputs to the direct outputs of the corresponding mask triggers, the D-inputs of which are connected to the installation inputs of the cTRa device mask, and the zero inputs to the input dew of the device and zero inputs of request triggers, whose synchronization inputs are connected to the outputs of the corresponding elements OR groups connected by the first inputs to the corresponding inputs Request serviced by the device, and the input clock frequency of the device is connected to the synchronization inputs of the trigger trigger Mas., the first inputs of the elements And the second group are connected with the device Ready output, and the second inputs with the outputs of the corresponding AND elements of the first group and with the corresponding inputs of the first OR element, the output of which is connected The first input of the first element And the outputs of the elements And the second group are connected to the information outputs of the device, characterized in that, in order to increase the reliability by eliminating the effect of short-term interference on the device's request inputs, two triggers are entered into it, the second and third elements And the second OR element connected by inputs to the device’s request inputs, and the output to the second input of the first AND element, the output of which is connected to the D input of the first trigger and the first input of the second AND element connected by the second by moving to the direct output of the first trigger, and output to the D input of the second trigger, the synchronization inputs of the first and second, and the first input of the third element I are connected to the clock frequency inputs of the device, the zero inputs of the first and second triggers are connected to the device reset input, the second output the trigger is connected to the Device Ready input, and the inverse output is connected to the second input of the third AND element connected by the output to the second inputs of the OR group elements. ffl jJlJljnjTJlJlJTJT rirLJTn