SU1709270A1 - Device for programmed control - Google Patents

Abstract

The invention relates to automatic control systems and can be used to automatically control various technological processes. The purpose of the invention is to simplify the device and expand its functionality by using conditional transitions. The device contains an input unit, control cells and actuators interconnected via the bus, sequential read inputs for the program, conditional transition inputs, uninterrupted transition inputs, and outputs. Each control cell contains a pulse generator, OR-HL elements, an inverter, an encoder, a multiplexer, a demultiplexer, and a program step counter. The control cell implements sequential reading of the program, conditional transition to the program step specified in the encoder, and unconditional transition to the first step of the program. The programming of the device consists in connecting via the bus the signal outputs of the input block and the command outputs of the control cells to the inputs of each of these cells in a predetermined sequence sequence, and their control outputs to the actuators. The device allows you to quickly compose and modify a program without the need for changes in hardware and programming knowledge. 3 il. (The invention relates to automatic control systems and can be used for automatic control of various technological processes and objects with alternative variants of interaction of the mechanisms included in them. The purpose of the invention is to simplify the device and expand its functionality by using conditional transitions. 1 is a block diagram of the device according to the invention; Fig. 2 is a control cell diagram; Fig. 3 is a diagram of the control cell operation. The device contains a block of 1 input yes, control 2.1-2.t cells, actuators 3. bus 4. 4. program sequential read inputs 5.1-5.t, unconditional jump inputs 6.1-7.t, unconditional jump inputs 7.1-7.t, command and control outputs 8.1-8 g. Each control cell 2 contains a multiplexer 9 that is VJUY.

Description

10 pulse generator, 1 / 1LI-NOT 11 element, inverter 12, OR-NOT 13,14 elements, encoder 15, demultiplexer 16. counter 17.

The input unit 1 provides coordination of the voltage levels of the signals coming from the sensors interacting with the actuators of the control object, as well as from other information sources (buttons, switches, logic elements, etc.) with the bus 4 logic levels buffer device node.

Each control cell 2 contains n inputs of 5i-5n sequential program reading, K inputs 6i-6k of conditional jumps, n outputs 8i-8n. The first 1-1 outputs of the counter 17 are not involved, and the rest from the 1st to the tth its outputs are connected to 1 ... To the address inputs of the multiplexer 9 and the demultiplexer 16.

The principle of operation of the control cell 2 is based on the step-by-step reading of information received at the inputs 5. Each step of the program corresponds to input 5p and output 8p. The program step is determined by the binary number present at the outputs of counter 17 at a given time. In the initial state, the outputs of counter 17 contain zeros, which corresponds to the first step of the program. With a sequential program run, the number is incremented by one each time. The possibility of arbitrarily setting the pitch of the program is provided by the encoder 15, which implements a certain combination of output signals depending on the state of a certain input. The code information set in the encoder 15 uniquely indicates the step of the program, the transition to which can be carried out if there are appropriate transition conditions. The conditions for the transition are always the absence of a signal at the input 5 of sequential reading of the program corresponding to the given program step, and the presence at this moment of one of the inputs 6 of the conditional transition. An unconditional transition to the first step of the program is carried out when a single signal is applied to the input 7 of the control cell 2 connected to the reset input of the counter 17, which causes it to be reset.

The operation of the control cell 2 is carried out as follows. The external signal through the open channel of the multiplexer 9 and the inverter 12 is fed to the first input of the element OR NOT 13, to the second input of which short clock pulses are supplied from the generator. 10 pulses. A counting pulse is generated at the output of the OR-NOT 13 element. A positive front acts on the counting input of the counter 17. Improving noise immunity in identifying the state of the input signal is achieved by a short duration of clock pulses, at which the probability of coincidence with the interference signal on the OR-HE 13 element is reduced. At the same time, the binary number at the outputs -t of the counter 17 is increased by one only after 2-times confirming the presence of an external signal at the polled input 5 of the sequential reading of the program, that rivodit the connection of the next output cell 2 May 8 control.

The implementation of the actuators 3 is determined by the specific interface conditions with the actuators of the control object.

0 Bus 4 is an arbitrary set of voltage matched electrical connections, consisting of signal circuits, command circuits, and control circuits. The programming of the automaton 5 consists in connecting via the bus 4 the signal outputs of the control input block 1 of the control cells 2.1-2.t to the inputs of each of these cells in a predetermined sequence sequence diagram, and their control outputs to the corresponding actuators.

One of the possible solutions for implementing conditional transitions is presented in the diagram of the operation of control cell 5 (Fig. 3). Let the output 82 of the external mounting control cell 2 be connected to the input 6i of the conventional junction. After going to step 2 at time ti and no signal at input 52 of sequential reading 0 of the program, the arrival of the next sync pulse to the second input of element ILINE 14 causes the formation of an enable pulse of the installation at its output and the installation of counter 17 in accordance with the code 5 information at its information inputs Di-Dm. At time t2, a single signal appears at output 8. Because at the same time one of the transition conditions disappears, namely, the signal at output 82. 0 and therefore also at input 6i of the conditional transition. the third input of the element OR-NOT 14 receives a single signal that prohibits the formation of the impulse to allow the installation, and further sequential testing of the program takes place. The arrival of a single signal at time t4 to the input 7 of the unconditional transition associated with the input of the counter 17 causes it to be reset, regardless of the state of the other inputs of the control cell 2. For the moment of time ts, there is no other condition, namely a low voltage level at the input 52 of the sequential reading of the program, therefore at the moment of time te the transition to the next step of the program occurs (step 3)

If the failure of the sensor can lead to an emergency, a check is made in the main program, similar to the example above, followed by a switch to the emergency subroutine.

The description of the operation of the device is represented by possible examples of the construction of devices in the order of their complexity.

Example 1. Sequential interrogation of information coming from the signal outputs of input unit 1 to inputs 5.1-5.t of sequential reading starting from the first step of the first control cell 2, the last one used by the command output of each of them connected to the first input 5 of the subsequent program , and the last of the used command output of the last control cell 2 is connected to the input 7 of the unconditional transition of each of them. This automaton implements one rigid sequence of operation of the actuators of the control object. Example 2. In addition, in any of the control cells 2, conditional transitions are performed by connecting the command outputs of this control cell 2 to the corresponding inputs of the conventional transitions of the same cell. In this device, it is possible to flexibly control the actuators depending on the current situation against the backdrop of a rigid program of controlling the entire object. In the particular case, a skip or repetition of a piece of the program implemented by this control cell 2 is performed.

Example 3. In addition, part of the inputs 6.1-6.t of conditional transitions and inputs 7.1-7.t of unconditional transitions are connected to the signal outputs of the input block 1. Such a connection provides emergency intervention in the course of operation of the control object.

Example 4. In addition, part of the command outputs of control cells 2 are connected to any of the inputs of foreign control cells 2. In this case, the independent processing of information by each control cell 2 and the coordination of work between them is carried out. Special case

This example is the use of one Hovl from control cells 2 to ensure that the rest work together.

This device has a smaller number of elements in comparison with the known, is more simple to manufacture and can be implemented on the same type of modules. In addition, the use of this device allows you to quickly make and

0 to change the program, without requiring changes in hardware and programming knowledge.

Ph o rumula and 3 b) A device for program control, containing control cells, via a bus connected by inputs of a sequential program reading to the signal outputs of the input block and control outputs with the inputs of the corresponding executive elements; different in order that, in order to simplify the device and expand its functionality by using conditional transitions, the command outputs of each cell

5 control via bus is connected to unused inputs of sequential program reading, unconditional jump input and conditional jump inputs of the corresponding control cell, each

0 of which contains a pulse generator, the first, second and third elements I.P1 / 1-NOT, an inverter, an encoder, a multiplexer, a demultiplexer and a counter, the outputs of the counter are connected to the addressable ones

5 multiplexer and demultiplexer inputs. the information inputs of the multiplexer are the inputs of the sequential reading of the control cell program. and the output is connected via the inverter to the first

0 the input of the first element OR NOT and directly with the first input of the second element OR NOT, the second inputs of which are connected to the output of the pulse generator, the third input of the second element OR NOT

5 is connected to the output of the third element OR NOT, the inputs of which are connected to the inputs of the encoder and the inputs of the conditional transitions of the control cell, the outputs of the encoder are connected to the information

0 counter inputs, the counting of which is connected to the output of the first element OR. the installation enable input to the output of the second element OR NOT, and the installation input ZERO is the unconditional control transition input, the demultiplexer input is connected to the power bus, the demultiplexer information outputs form the control and command outputs of the control cell.

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Claims (1)

Claim A device for program control, containing control cells, via a bus connected by inputs of sequential program reading with signal outputs of an input unit and control outputs with inputs of corresponding actuating elements; characterized in that, in order to simplify the device and expand its functionality through the use of conditional transitions, the command outputs of each control cell via the bus are connected to unused inputs of sequential reading of the program, the input of the unconditional transition and the inputs of conditional transitions of the corresponding control cell, each of which contains pulse generator, first, second and third elements OR NOT, inverter, encoder, multiplexer, demultiplexer and counter, counter outputs are connected with the same address inputs of the multiplexer and demultiplexer, the information inputs of the multiplexer are inputs of the sequential readout of the control cell program, and the output is connected through the inverter to the first input of the first OR-HE element and directly to the first input of the second OR-HE element, the second inputs of which are connected to the output of the pulse generator , the third input of the second OR-NOT element is connected to the output of the third OR-NOT element, the inputs of which are connected to the inputs of the encoder and the inputs of the conditional transitions of the control cell lines, the encoder outputs are connected to the information inputs of the counter, the counting input of which is connected to the output of the first element ORINE, the installation enable input is to the output of the second element OR NOT, and the zero setting input is the input of the unconditional transition of the control cell, the input of the demultiplexer is connected to the power bus, information outputs of the demultiplexer form the control and command outputs of the control cell.