SU1702356A1 - Device for information input/output - Google Patents

Abstract

The invention relates to computing and automation and is used for switching DC and AC circuits and outputting discrete signals to an actuator in information and control computing systems. The purpose of the invention is to increase the reliability and reliability of discrete-signal input / output. The device contains a switching unit 1, a unit 2 connection, the first 3 and second 5 control units, a unit 4 control actions, a current sensor 6 in the form of a resistor and an isolating element 7 in the form of a diode. This goal is achieved due to the fact that it provides not only the ability to monitor the health of the device both when connecting and disconnecting the load, but also to indicate the nature of the failure. 7 Il. W Ё

Description

The invention relates to computing and automation and is used for switching DC and AC circuits and the input and output of discrete signals to an actuator in information and control computing systems (IUVS /

The purpose of the invention is to increase the reliability and reliability of discrete-signal input / output.

Figure 1 shows a diagram of the proposed device; figure 2 - switching unit; FIG. 3 shows a communication unit; Fig. 4 illustrates a state control unit; figure 5 is a block of control actions; figure 6 - block control of reliability; Fig. 7 shows a state table of signals of the confidence control unit.

The device contains a switching unit 1, a communication unit 2, a first control unit 3, a control action unit 4, a second control unit 5, a current sensor 6, for example, in the form of a resistor, a decoupling element 7 in the form of a diode, the first 8, the second 9 and Third 10 control inputs of block 1, first 11 and second 12 outputs of block 1. input 13 and output 14 of block 2, first 15 and second 16 outputs of block 3, first 17 and second 18 outputs of block 4, first 19 and second 20 inputs of the block 4, the output 21 of the unit 5 and the load 22.

The switching unit 1 contains an output transistor switch 23, loaded onto the element of galvanic isolation and switching, the role of which is performed by the electromagnetic relay 24 with contacts 25, the logic element AND 26 and the trigger 27 with tum8

GO SO

ate

Os

Blera 28 and 29, providing independent control device. The clock and information inputs of the trigger 27 are connected respectively to the toggle switches 28 and 29 and the corresponding control input of the switching node.

Changing the state of the trigger is carried out by changing the levels of the signals at the clock and information inputs by turning on the toggle switches 28 and 29 of the lmbo corresponding logic signals at the input 8 of the device.

At the same time, the presence of the potential corresponding to the logic level 1 on the information and clocked inputs of the rig 27 corresponds to its transition to the 1st state, and the key 23, provided there is no blocking signal on the device input 8 to the open state and the closure of the contacts 25 of the relay 24, which means switching on the load 22. Switching off the load is provided by putting the trigger into the state by turning on the toggle switch 28 when the toggle switch 29 is turned off.

The communication unit 2 contains a transistor switch 30, an indication element 31, an opgron pair 32, a filter 33. Functionally, unit 2 provides for receiving, indicating and transmitting a link state code with a load on the logical processing in control unit 5.

Control unit 3 contains threshold devices 34 and 35, optocoupler switches 36 and 37, voltage divider 38, filter 39. Functionally, unit 3 monitors the state of control circuits, input 9 and load 22 by comparing the input signal Uex at block 9 3 with the reference signal U0n, which is defined with the help of dividep 38, and the formation and transmission of a signal corresponding to the logical level 1, to the corresponding input of block 5 in the event of their exceedances. Logically 1 is formed at the output if the input signal level

UBX UorH

and at output 16, if

,

The control actions unit 4 contains transistor switches 40 and 41: a toggle switch 42 and a transistor optocoupler 43 for switching DC circuits and optocouplers 44 and 45, which are structurally designed similarly to the switch 36, filter 46. Functionally, the block 4 serves to generate test actions (test signals ), ensuring the operability of the communication unit 2, the health of the input 9 with the load 22 and the switching unit 1.

The formation of test stimuli at the outputs 9 and 13 of block 4 is carried out by turning on the toggle switch 42 of the corresponding keys 40 and 41 or by feeding

signals of the corresponding logic levels at input 19 or 20, respectively. At the same time, at the output 17 or 16, respectively, a feedback signal is generated indicating the mode of the corresponding test.

The control unit 5 contains the logic elements I / 47 and 48, the logic element OR 49, which generates a signal that the control reliability and good health

5 devices and logic elements And 50-56. Functionally, unit 5 provides control of the operating mode of the device, reliability of control and operation of the device, which may be impaired.

0 both in the absence and in the control process, which is equally bad and requires immediate elimination of the malfunction. Signal of device malfunction and reliability of control X49

5 is formed at the output of the logical element OR 49, regardless of whether it is activated or not.

In the event of a malfunction of the device, the output of the element 49 forms a generalized signal of violation of the control of the Stroke corresponding to logic 1, and the outputs of the logic elements 50-56 report on the possible causes of the malfunction.

5 Figure 7 shows a table of the states of logical signals at the inputs and outputs of the elements of the control unit 5 in various modes of operation of the device and the types of possible violations and consequences of violations.

0 The signals X “, Hm, XIB, Xie, Xi7, Xm presented in the table are logical signals at the corresponding inputs of block 5, and X47-Xse are logical signals at the outputs of the corresponding logical elements of block 5,

five

The device works as follows.

8 initial state of the toggle switches 28 and 29 of the switching unit 1 and the toggle switch 42 of the block 4

0 control actions are disabled.

The trigger 27 is in the reset () state, which is accomplished by pre-switching the toggle switch 28 when the toggle switch is off. In accordance with this state 5, the key 23 is closed, the contacts 25 of the relay 24 are open, and the optocoupler 32 of the communication unit 2 is energized by a power source the load 22. In connection with this, the key 30 of the communication unit 2 is closed and the signal Xi4 at the output 14 corresponds to the logical 1. At the same time

signals Xp at output 11, Xi2 at output 12 of switching unit 1, Xis at output 15 and Xie at output 16 of control unit 3 correspond to the value of logical O. In accordance with the state table at output of logical element And 47, a signal X47 is generated, corresponding to the value of logical 1, and the output of logical element OR 49 is an X49 signal corresponding to logical O, which indicates a mode of control (mode 1) and no disturbances in the control and power supply circuits of the device and the load 22.

If it is necessary to turn on the load 22, we turn on the tumblers 29 and 28. The trigger 27 goes into one state. If there is no blocking signal at input 13, logic element 26 enters the state corresponding to logic 1 and, by opening output key 23, generates at output 12 of switching unit 1 a signal Xi2 corresponding to logical 1. Contacts 25 of relay 24 are closed, shunt the excitation circuit of the LED of the optocoupler pair 32 of the communication unit 2. The key 30 opens and the signal X1.4 at the output 14 takes on the value logical O. Simultaneously, through the closed circuit of the contacts 25 and the current sensor 6, a current flows, the value of which is determined by the state of input 9 and the load 22.

With a good load and no faults (interruptions or short circuits) in input 9, the signal level at input 11 of control unit 3 exceeds the reference signal Don 1 by a specified amount and sets threshold device 35 to the state corresponding to logic 1. Optron pair 32 of key 37 is energized and translates it into a closed state. The Xis signal of block 3 takes the value corresponding to logic 1. In accordance with the state table of the input signals, the output of logic element 48 generates a signal X48, corresponding to logical 1, and the signal X / I7 at the output of element 47 is logical O, which indicates the start of control (switching on the load 22), at the output of the logic element 49, the signal Xze retains the value of the logical O, which indicates the absence of any disturbances and the reliability of the control. This state is maintained until a stop signal arrives, i.e. trigger 27 is not reset or the control lock signal does not come from an external source at input 10 of block 1.

In case of occurrence of violations in the load circuit, for example, break of input 9, the signal at input 11 of unit 3 takes a zero value. Threshold device 35 goes over

in the initial state. The key 37 opens and the signal Xis at the output 15 of block 3 takes the value logical O. In accordance with the state table at the output of logic element 49, the signal X49 appears, the value of which corresponds to the logical 1, which indicates the detected violations control, and at the output of the logic element 50, the signal Xso corresponds to the logical 1, which indicates disturbances in the input 9, which can be caused by both an open circuit and a short circuit in the input 9.

To remove this uncertainty and clarify the nature of the failure, it is necessary to remove the control, i.e. transfer the trigger 27 to the 0 state (and the signal Xi4 retains its value), and, including the toggle switch 42 of the key 41 of the block 4, force-feed E to the input 9 through the opened transistor optocoupler 43 of the key 41. Due to the forced excitation of the optocoupler 32, the optocoupler key 45 of block 4 goes into the closed state and the output 17 of block 4 generates an XIT signal corresponding to logical 1, which indicates the test mode of communication input 9 (mode 3.1). At the same time, in the event of a break in the input 9, an optocoupler pair 32 of the switch 30 of the communication unit 2 is energized and switches it to the closed state. The signal Xi4 at output 14 takes on the value of logical 1, which confirms the interruption of the communication line. At the output of the logic element 51 of block 5, an Xsi signal appears corresponding to the logical 1.

If there is a short circuit in the input 9, the input circuit of the optocoupler pair 32 of the unit 2 is shunted by the short-circuited input 9, which is why excitation of the optocoupler 32 does not occur and the signal Xi4 at the output of the communication unit 2 retains the value of logical O. Block 5, the Hb2 signal appears. corresponding to the logical one. To verify the reliability of the findings of the cause of the failure (for cases of complex failure), remove the excitation of input 9, check the operability of the communication unit 2.

For this, turning off the toggle switch 42 of the key 41, turning on the toggle switch 42 of the switch 40. The transistor optocoupler 43 of the switch 41 closes and breaks the circuit of the forced power supply. The optocoupler key 45 opens and the signal XT at the output 17 of block 4 takes on the value of logic O, and the transistor optocoupler 43 of key 40 opens and excites the optocouple 32 of the communication block 2 and the key 44 of block 4. At output 18 of block 4, the signal Xia appears logical 1 what

talks about testing unit 2 communication (mode 3.2).

When the communication block 2 is in good condition, ron 32 is energized and translates the key 30 of the communication block 2 into a closing state. Signal Xi4 at output 14 takes the value of 1, and in case of failure, logical O. In the latter case, at output 21 of logic element 53, a signal Xs3 is formed, corresponding to logical 1, indicating a failure of block 2 and unreliability of previously obtained conclusions about the causes of violations,

In the event of faults for the purpose of load 22 when it is turned on, for example, an interturn circuit in the load, its ohmic resistance decreases, which leads to an increase in current in the circuit of current sensor 6. The signal level at the input 11 of the control unit 3 exceeds not only Uoni, but also Uon2, transferring the threshold devices 34 and 35 to the logical state 1. As a result, the optocoupler 32 keys 36 and 37 are energized and put them into the closed state. The signals Xy and Xie on pins 15 and 16, respectively, take the value corresponding to logical 1,

In accordance with the state table of logical signals at the output of logic element A 54, a signal Xe4 is formed corresponding to logic 1, which indicates violations in the 22-loop circuits. In addition to these messages, the signal Xss is generated at the output of logic element 55, corresponding to logic 1, if the control command release signal does not pass, which, as in the case of input 9 short circuit, leads to self-switching off (self-driving) of the load, and logical 1 at the output of logic element 56 Igna Xc, second, if the command does not pass to the control switch and the load 22 is not turned on.

Claims (1)

Invention Formula A device for inputting information containing a switching unit and a communication unit; the second control input of the switching unit is an information input of the device, characterized in that in order to increase the reliability and validity of input-output of discrete signals, the first and second control units, the control action setting unit, the current sensor and the isolating element are entered into it on the diode, the second control input of the switching unit is connected to the anode of the diode and to the first output of the control action setting unit, the cathode of the diode is connected to the output of the communication unit and to the second output the control actions set unit, the first and second inputs of which are the fourth and fifth control inputs of the device, respectively; the third and fourth outputs of the control setting block impacts are connected respectively with the first and second information inputs of the second control unit, the third, fourth, fifth and sixth information inputs of which are connected respectively with the output of the communication unit, with the second output of the switching unit, with the first and second outputs of the first control unit, the input of which is connected to the first input of the switching unit and the first output of the current sensor, the second output of which is connected to. Gadtani bus, the first and third control inputs of the switching unit are the first, second and third control inputs of the device, the outputs The second control unit is the output of the device. 21 t t " th "/ .J Outf.Z (3 (pt / e.Z cpue.S 17 16 fi.b Device operation modes: Rename I - control disabled (off) Mode 2 - control vyushcheno (on) Mode 3.1 - testing of LAN circuits and load 20 - Re.5im 3.Ј - testing of communication node 7Fi.2.7