SU1080120A1 - Programmed control device - Google Patents

Description

The invention relates to automation and can be used in various sectors of the industry for cyclically controlling objects or processes as a function of time. A software device is known that contains a pulse generator, a time counter, a coincidence circuit, a switching unit 1. The device issues time-programmed commands alternately through channels. management However, in the process of executing the main control commands of the unit. It may be necessary to submit auxiliary commands that have a temporary connection with the main ones. This device does not have this capability, which limits its scope. Closest to the invention is a device comprising a pulse generator, a switch, the first and second counters, the first and second comparison units, the first and second time controllers, the AND element, the command issuing unit, and the Data Shaping Unit on the time setters. The pulse generator is connected to the first input of the switch, the first and second outputs of which are connected to the counting inputs of the first and second counters, respectively. The output of the first counter is connected to the first input of the second comparison unit, the first output of which is connected to the second input of the switch, and the second output to the first input of the element I. The output of the second counter is connected to the first input of the first comparison unit, the second input of which is connected to the first the output of the second unit of time, and the output to the second input of the element And, the output of which, in turn, is connected to the unit issuing commands. The outputs of the command issuing unit through the data generating unit are connected to the input of the first time setter, the output of which is connected to the second comparison, and to the input of the second time setpoint, the second output of which is connected to the second input of the first counter. The device works as follows. From the pulse generator through the first output of the switch, the pulses arrive at the input of the first counter. The second comparison block is triggered when the codes of the first counter and the first setter, whose contents correspond to the execution time of the main command, match. Thus, the moment of operation of the second unit of comparison coincides with the required moment of issuing the auxiliary team. From this point in time, the switch is switched, and the pulses from the generator begin to flow to the second counter, the contents of which are compared in the first comparison unit with the contents of the second time master. The first comparison block is triggered at the moment when the sum of the time counted by both counters is equal to the execution time of the main command. The signals from the comparison units through the AND element are sent to the command issuing unit, which works like a shift register. The command sending on channel n is stopped and the command sending on channel h + 1 begins. in accordance with the new channel number, the data generation unit enters the new data into the first and second tasks of the time C2l. A disadvantage of the known device is its complexity, consisting in the presence of a switch, a second counter and a second comparison unit. The purpose of the invention is to simplify the device. The goal is achieved by the fact that the device for programmed control contains a pulse generator, a pulse counter connected by the output of each bit to the first inputs of the comparison unit connected by the output to the first input of the first element AND connected to the output of the command block connected by the outputs to the input the data generating unit connected by the first and second outputs to the inputs of the first and second time controllers, respectively, contains a block of OR elements, blocks of the second and third elements AND and R5-trigger p, connected by an input to the output of the comparison unit, an inverse output to the first input of the second And block, and a direct output to the second input of the first And element, and the first input of the third And block, and the second inputs of the second and third And blocks from the output, respectively, of the first and second time controllers, and the outputs - with the inputs of the block of the OR elements connected by the outputs to the second inputs; the comparison block. FIG. 1 shows a block diagram of the proposed device; Fig. 2 is a block diagram of data generation. The device contains a generator of 1 pulses, a counter of 2 pulses, a block of 3 comparisons, an element of AND 4, a block of 5 commands, an element of OR 6, a block of second elements of AND 7, a block of third elements of AND 8, R5-trigger 9, first 10 and second I. Sensor time, the data generation unit 12 is the first. output 13 of the device, the second exit 14 of the device. The data generating unit 12 comprises an address encoder 15 and a memory unit 16. Each cell of the memory block 16 stores the time code for issuing an additional command for unit 10 and the time code for the main command for unit 11 ,. At the beginning of the execution of each main command, the encoder 15 generates the address of the required cell of the memory block 16 and the corresponding data goes to the sensors 10 and 11. The device works as follows. In the initial position, the counter 2 and 3 flip-flop 9 are in the zero state (zeroing circuit for simply not shown). In unit 10 there is a code corresponding to the time of issuing an additional command when executing the main command on the first control channel, and in unit 11 there is a code corresponding to the execution time of the main command on the first control channel. From generator 1, counter 2 receives impulses that count the time of the commands. The contents of counter 2 are delivered to the first inputs of block 3 of the comparison. Since 1 3 flip-flop 9 is in the zero state, the second inputs of block 3 receive a code from setpoint 10 time through a block of second elements AND 7 and a block of elements OR 6 .. When the codes from the counter 2 and setpoint 10 coincide, the comparison unit 3, wherein the trigger 9 is set to one state and the issuance of an additional command on the first output 13 of the device begins.

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Series 2 Trigger 9 has a delay on a single input, which is necessary to avoid possible triggering of element 4 due to a race of fronts from block 3 and single output of trigger 9. Switching trigger 9 to single state removes the permissive potential from the block input elements And 7 and provides its input to the block of elements And 8, thereby submitting to the second input of block 3 a code for protection, time 11; Upon further arrival of the pulses to the counter 2, the secondary operation of the comparison unit 3 occurs, when the codes of the counter 2 and the setting device 11 coincide, which corresponds to the moment when the execution of the main command ends. This causes the opening of the element And 4, and a signal is sent to the command issuing unit 5. The issuing unit 5 is in the form of a shift register, therefore, the issuance of a command via the first control channel is stopped and the issuance of a command via the second control channel begins. When this happens, the counter 2 and the trigger 9 (circuits not shown) are reset, and, in addition, the signal from block 5 is sent to the encoder 15 of block 12, where the cell address of the memory block 16 is generated, in which data for the controllers 10 and 11, required when executing the second command. The operation of the device on the second (and then the subsequent) channel is carried out similarly. The use of the proposed device allows reducing hardware-based costs for the implementation of the device by eliminating the switch, the second counter and the second comparator unit.

Claims (1)

A DEVICE FOR SOFTWARE CONTROL, comprising a pulse generator, a pulse counter connected to the output of each digit with the first 'inputs' of the comparison unit, connected to the first input of the first AND element, connected to the output from the input of the command block, connected by ¹ outputs to the input of the data generation unit, connected first and second outputs with inputs of the first and second time clocks, respectively, characterized in that, in order to simplify the device, <it contains a block of OR elements, blocks; of the second and third AI elements RS trigger connected by an S-input to the output of the comparison unit, the inverse output to the first input of the block of the second AND elements, and direct output to: the second input of the first AND element and the first input of the third AND element, and the second inputs blocks. second and third elements. And they are connected with the outputs of the first ^{ζ of the} first and second time clocks, and the outputs are with the inputs of the block of OR elements connected to the outputs of the second inputs: the comparison block. figure 1