SU1615698A1 - Data input device - Google Patents

Abstract

The invention relates to computing and can be used to enter information from consoles and sensors in an automated process control system, as well as in remote and local control panels of telemechanical systems. The aim of the invention is to increase the reliability of the device. The device includes a keyboard 1, first and second registers 2.9, shaper 3 pulses, element AND-NOT 5, element 6, trigger 7, encoder 8, and block 10 comparison. The goal is achieved by the fact that a register 9, an encoder 8 and a comparison unit 10 are entered in the information input device. This made it possible to implement a fairly simple input device based on a comparison of the codes of the current and previous states of the keyboard, which in principle eliminated the dependence of the operation of the device on its initial state. 3 il.

Description

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SP

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The invention relates to computing and can be used to enter information from consoles and sensors in an automated process control system, as well as in remote and local control panels for remote control of telemechanical systems.

The aim of the invention is to increase the reliability of operation and the field of application of the device,

FIG. 1 is a block diagram of a device for inputting information; FIG. 2 is a block diagram of a keyboard; Fig, 3 - time diagrams of the device,

The device (FIG.) Contains a keypad 1, a first register 2, a shaper of 3 pulses, a generator of 4 pulses, an AND-HE element 5, an AND 6 element, a trigger 7, an encoder 8, a second register 9, a comparison block 10 that controls output 11, information outputs 12, common keyboard buses 13 (the first group of keyboard outputs) and buses 14 buttons without arresters,

The keyboard (FIG. 2) contains a field

15 buttons with arrestors (KN, A ,,, KN, Ay ,,, KH, Af /) and a field of 16 buttons without arresters (KN, A, ,, KH.Aj4,, KN, A, (). Group

K + N outputs of contact pairs of the whole - the keyboard forms tires 14, the Group of N outputs of contact pairs of field 16 forms tires 13,

The device works as follows

From the keyboard 1 on tires 14 on. the input of the encoder 8 receives the position status code of the keyboard, in which level 1 corresponds to the unlit status of the contact pair, O - closed (FIG. 1). In the initial state, all contact pairs are field

16 buttons are open and level 13 signals are present on all 13 tires

At the output of the element AND-NOT 5 and, accordingly, at the information input of the trigger 7 there is a signal of the level O,

At the outputs of the encoder 8, the inputs of registers 2 and 9 and both inputs of block 10 there is the same code, the output of block 10 is a level signal O, Let the button with arresting device KH, A (Fig 2) field 15 of buttons be on the on state (with the output of the contact group receives a signal of the level O). Then when the button K, A switches on the input and output of the encoder B, the codes change, Accordingly, the code changes on the input of block 10 connected to the output of the encoder, which causes a change in the output signal this block from O to 1,

Signal Level 1 starts the shaper 3, whose operation is synchronized by the signals of the generator 4,

The period of the clock signals T from generator 4 is selected from

ratios

T2 Tdr,

Where Tar is the time for contact bounce.

Performing this ratio neutralizes the effect of transient processes that occur when switching the contacts of a button (sensor) on the operation of the device.

After a time TF (FIG. 3), a signal appears at the output of the imaging unit 3,. which is through element 6 and (trigger 7

is in its original state) CKJT-

It synchronizes the record of the 1 keyboard status code into register 2 and is fed to the control output of the device.

At the same time, the signal from the driver output synchronizes the writing of the same keyboard status code to register 9, which, in turn, leads to a logical condition for comparing the codes on the inputs of block 10 and changing the signal on the driver to the O level, as a result of which the driver arrives in j the initial state.

At this, the cycle of entering information from the button Kn A: ends,

Thus, all changes in the arresting buttons (on, off) cause input of information.

Next, we consider the operation of the device when entering information from buttons without arresters (Fig, 3),

When one of the KH, AJ buttons is pressed, the floor of the 15 buttons at the output of the NAND element 5 generates a level signal I which enters the information input of the trigger 7, at the same time the codes change at the input and output of the encoder 8, which in turn causes a violation Comparison of codes in block 10 and that the next start of the imaging unit 3, the output signal of the imaging device, synchronized with the generator clock signals, is fed to the control input of the register 2 and to the output 11 of the device, B register 2 records the keypad status code.

In addition, the same signal at the trailing edge includes trigger 7, while blocking the signal distribution circuit at output 1 at the input of element 6 and synchronizing the writing of code to register 9,

When the button is released, the signal O of the trigger 7 appears on the level O and the driver 3 starts (the start of the driver does not differ from the described one).

The signal from the output of the imaging unit 3 sets the trigger 7 to the initial state and synchronizes the recording of the keyboard status code to the register 9, thus preparing the device for further work on entering information.

Thus, the device allows the input of information both from buttons without arresters and from buttons with arresters.

Claims (1)

Apparatus of the Invention containing keyboard, pulse shaper, trigger, AND element, element, first register, generator pulses, Emeitas inputs are NOT connected to the first group of outputs of the keyboard, the outputs of the first register are informational outputs of the device, the output of the generator of pulses is connected to the input-synchronization of the pulse former, in order to increase reliability devices entered into it 10, a second register, a comparator unit and an iifter, the inputs of which are connected to the first and second groups of keyboard outputs, the outputs of the encoder are connected. with information inputs first and 15 of the second register and the first group of inputs of the comparison unit, the second group of inputs of which is connected to the outputs of the second register, the output of the comparison unit is connected with the information The 20 input of the pulse generator, you-i, the stroke of which is connected to the control input of the second register, with the first input of the element I, with the synchronization input of the trigger, the information input 25 of which is connected to the output of the NAND element, the inverse output of the trigger is connected to the second input of the AND element, the output of which is connected to the control input of the first register and is 30 control output device. FIG .. Fi.Z