SU1381542A2 - Parameter controller - Google Patents

Abstract

The invention relates to instrumentation technology and can be used in systems for monitoring and displaying information. The purpose of the invention is to increase the reliability of the device and the reliability of the monitoring parameters. The device contains switching units 1, measuring parameters 2, processing data 3, controlling 4, printing 5, memory 11 and logical protection 24, elements NOT 6, 14, elements AND 7, 8, 13, 15, 18, 20, elements OR 9, 12, 19, the control panel 10, the record counters 16 and the address reproduction 17, the driver 21, the re-display signal bus 22 and the re-display end signal bus 23. The device allows the power keys of the control and display console to be protected from being output from a short circuit and to determine the moment of its termination. 1 hp f-ly, 3 ill. with SS (L

Description

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The invention relates to instrumentation technology, can be used in automatic systems for controlling complex objects and technological process and in information display systems and is an improvement of the invention according to the author, sv. No. 765812.

The aim of the invention is to increase the reliability of the device and the reliability of the control results.

Fig.1, 1 shows the block diagram of the device; on fig; 2 shows schematic diagrams of a logical protection unit and a control and indication console in FIG. 3 - graphs that explain the operation of logic protection.

The device for controlling parameters contains a block 1 of combination, a block 2 of measuring parameters, a block 3 of data processing, a block 4 of control, a block 5 of printing, a first element NOT 6, a first 7 and a second 8 elements AND, a first element 11 P1 9e a console 10 of control 11 memory, the second element OR 12, the third element AND 13, the second element NOT 14, the fourth element And 15, counters 16 and 17 of the recording and reproduction of the address, respectively, n - the element And 18 the third element OR 9. the sixth element And 20, the former 21 Repeating indication signal 22, re-termination signal bus 23 display and block 24 logical protection.

Block 24 consists of n channels, each of which includes the first 2 j and the second 26 resistors, the zener diode 27, the first 28 and second 29 keys, as well as the first 30 and second 31 pulse shapers, element 2 IS – NE 32 to the resistor 33. The remote control 10 includes n channels containing elements 2 AND-NOT 34-36, the key 37, the transistor switch 38 and the indicator lamp 39.

The device works as follows

According to the signals of control unit 4, switching unit 1 alternately connects input signals to parameter measurement unit 2, which digitally outputs measured parameter values to data processing unit 3 According to the processing results, unit 3 in case of a parameter or its combination beyond the tolerance field generates a control signal for printing resolution, a parameter or its physical value in block 5 and for recording the parameter number in memory block 11 at the address of the counter 16. At the same time, the contents of counter 16 are overwritten into the counter 17. Pr and this is the address from counter 17 to the input block

I1 does not arrive, because the element

And 15 is closed by a signal from the output of the element NOT 14.

Information from the output of the memory block 11 to the control panel 10 is not received, since the AND element 8 is closed due to the absence of a signal on the bus 22,

5 On the console 10, the current information about the results of the control is displayed. When a signal appears on the splint 22, the contents of the counter 17 decrease by one, the element And 13 is blocked

0 and the address from counter 17 through open element I 15 is fed to the input of the block

IIpami, information from the output of which comes through an open element And 8 to the input of the remote control 10. When

5 this element AND 7 is blocked by a signal from the output of the element NOT 6. Thus, on the control and display console 10, the previous information about the results of the control is displayed. 0 When the signal on bus 22 reappears, the contents of counter 7 decrease by one more, information corresponding to an even earlier event is displayed on console 10, and so on.

When a signal appears on the tongue 23, the element 20 opens and the contents of the counter 16 is transferred to the counter 17, the control circuit of the memory unit returns to its original state.

The operation of the logical protection unit 24 in conjunction with the operation of the control and display console 10 will be considered using the example of one of the channels, which are identical both constructively and functionally.

From unit 3 to the input of the console 10, in accordance with the logic of the device for controlling parameters, signals are received to turn on the corresponding channels.

The signal arrives at the first input of element 2И-НЕ 34. At its second input, a signal is barred from switching on the channel from the element OR 9, which can block the passage of the signal to the AC signal. From the output of element 2I-NOT 34, the enable enable signal is fed to the first input of element 2I5

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NOT 35, to the second input of which an indication verification signal is received from element OR 9. From the output of element 2И– 35, the enable enable signal goes to the first input of element 2 – NO 36, the second input of which receives the signal of a pulse-width modulus control of the brightness of the indicator lamps from the element OR 9. From the output of this element, the control signal goes to the load resistor and the input key 37, the output of which is connected to the second load resistor and directly controls the switching on of the power transistor switch 38, kryva it.

When the channel of the control and display console 10 is turned on, an opening potential is supplied to the base of the transistor switch 38, with which it opens. Circuit: indicator lamp 39, current limiting resistor, collector-emitter of transistor switch 38, a current flows (Fig. 3A), creating a voltage drop on an open transistor switch and a current limiting resistor not exceeding the value of the stator voltage of 27 block 24. Consequently, the zener diode is closed and the voltage at the base of the key 28, created by the current flowing through the resistor 26, keeps this key in the closed state without affecting the channel operation of the included indicator lamp.

When a short circuit occurs in the load circuit of the indicator lamp, which at the same time goes out, a short circuit current flows through the transistor switch 38 and the current limiting resistor. On the current-limiting resistor and transistor switch, the entire supply voltage + U falls. This voltage across the resistor 25, which limits the current flowing through the Zener diode, is applied to the Zener diode and opens it, creating a opening potential at the base of the key 28. The key 28 is opened by supplying a blocking voltage to the base of the transistor switch 38. The transistor switch closes, blocking the flow of a short circuit through it and preventing it from failing with the power transistor switch.

To verify the presence of a short circuit from the control unit 4 to

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a pulse shaper 30, consisting of a resistor, a capacitor, and two 2I-NO elements, a block 24 is pulsed (Fig. 3b).

For their leading edge, the forcing 30 generates positive pulses (fig. Sv), which through element 2I-NOT 32 arrive at the base of the key 29 and open it. The key 29 closes the key 28, which, in turn, opens the power transistor switch 38 of the console 10 for the duration of the check pulse: If the short circuit disappeared before the pulse, the voltage removed from the section: the current-limiting resistor, the transistor switch, becomes less + U by the amount of voltage drop on a normally operating indicator lamp. The Zener diode 27 of the block 24 is closed and at the base of the key 28 there is a permanently closing potential, which turns off the output of this channel from the base of the transistor key. The channel of the console 10 is returned to its original operating state.

If the short circuit has disappeared, then at the end of the validation of the test pulse on the basis of the key 28 of the block 24, the potential again appears and the transistor switch of the console 10 is closed again.

Shaper 31, similar to shaper 30, is used to open transistor switches 38, -38 after the end of the impact of the closing pulses of pulse-width modulation, regulating the luminance of the indicator lamps 39 -39.

Claims (2)

1. Device to control the parameters of the author. St. No. 765812, characterized in that, in order to ensure the reliability of the device and the reliability of the control, a logic protection block is entered in it, a group of inputs and a group of outputs of which are connected respectively to the groups of outputs and additional inputs of the control panel, and the second input with the output of the control unit. 2. The device according to claim 1, characterized in that the logical protection unit contains two pulse shapers, the element 2I-NOT, a resistor and p identical protection channels, each of which contains the first and second resistors, a zener diode, the first and second keys, the inputs of the second keys of all channels are connected to the output of element 2I-NOT, also connected to one of the resistor terminals, the other terminal of which is connected to the source of the reference voltage, the first and second inputs of the element 2I-NOT are connected respectively to the outputs of the first and second pulse shapers, the inputs of which are connected with the second input of the unit, the input of the first key of each channel is connected with the output of the Zener diode, the first output of the second resistor of the same channel and the first output of the second key, the second output of which is the second output of the first key and the second output of the second resistor are grounded, the first outputs of the first keys of all channels form a group of outputs of the block, the input of the Zener diode is connected to the first output of the first resistor, the second output of which is one of the inputs of the group. I act  short sniffing  paws 33I