SU1238034A1 - Programmed control device - Google Patents

Abstract

The invention relates to software control systems, such as turbine starters. The purpose of the invention is to increase the reliability of the device and expand its functionality. For software control, ycTpoiicTBo contains a parameter sensor unit, a logic unit, a inhibit unit whose output is connected to a timer and a stage counter unit, an output connected to a decoder, a control and indication unit, a control command generation unit, a position sensor unit and an actuator unit. In this device, the separation of prohibiting signals to continue the program, depending on the reason for the prohibition (exceeding the prohibition time or parameter mismatch) allows determining the reason for the prohibition, to start the device to continue the program after eliminating the reasons for suspension. 2 Il. (L to oe 00 oo 4

Description

The invention relates to software control systems, such as turbine start-up.

The purpose of the invention is to increase the reliability of the device and expand its functionality.

Figure 1 presents the block diagram of the device; 2 shows an example of a specific embodiment of the device.

The device contains a stage counter block 1, a decoder block 2, a control command generator unit 3, a control and display unit 4, a logic block 5, a first block 6 of parameter sensors, a second block 7 of position sensors, an actuator block 8, a timer 9 and a prohibition block 10.

In Fig.2 marked: elements NOT 11-16; elements OR 17-22 and signals; A - from the parameter sensor (there is a parameter: 0) j B- from the position sensor (there is a signal: O) J b readiness of stage (O), - prohibition on disappearance of the parameter (prohibition 1); D - control by the counter and timer (switch over. O); I- - prohibition for time exceeding the stage (prohibition 1); K - signal stage (O); M- time limit of the stage (0) v LED - Excess time of the stage; V2 LED - No parameter.

Unit 6 is a galvanic isolation unit through which input signals from the contacts of the parameter sensors (for example, reaching the temperature or setpoint speed) or operator commands (for example, triggering the Start or Stop signal) are received.

This block can be implemented as a set of reed relays, the windings of which are turned on by one of the indicated signals, and their contacts give signals to the block 5 of logic. In block

5logs, under other schemes, are meant the assembly schemes of readiness of stages, each of which is an assembly of parameter signals (coming from the first block

6 sensors of parameters), signals from limit switches (coming from the second block of 7 sensors of actuator pole), controlled at this stage, and a signal of the corresponding stage.

Functional purpose of the unit 6 - galvanic separation

0

five

input signals to the software control device.

The signal confirming the readiness of the technological parameters enters the logic block 5 from the block 6 of the parameter sensors.

The prohibition signal is generated when the time of a stage in block 4 (signal t) is exceeded at each stage when the signals of the stage coincide with the time it passes (signal m). The diagram shows a single cell matching signals M and K. In a real block of signals, 5 as many as stages, and signals And as many as temporary us- in the start-up algorithm (figure 2), i.e. K - cells of coincidence of signals m and k. Thus, by other schemes, coincidence schemes (time lapse cells) are meant.

The device works as follows.

At the operator's command, which comes from block 6, a signal is generated at the output of block 5, which through the block 10 prohibition enters the first input of block 1 of the stage counter. This leads to the switching of block 1 of the stage counter by one step (stage). Each state of the logic block 5 corresponds to its own code at the output of block 1 and its own signal — a signal from the stage at the output of the decoder 2. This signal corresponds to a certain, in this case, first, stage of the program. The signal from the output of the logic block 5 through the prohibition block 10 also goes to the input of timer 9 and sets the timer to the initial state (if it was not in the initial state). The timer begins counting the time of the first stage.

The signal of the stage from the output of block 2 through block 3 of the control command generator includes the executive mechanism of the first stage of the program in block 8 of actuators. 0

After performing the operations of the first stage, a signal appears on the output of the position sensor unit 7 to perform the operations of the first stage, and on the 5 output of the parameter sensor unit 6 a signal confirming the readiness of the technological parameters of the second stage.

0

five

0

five

The combination on all inputs of the logic block 5 signals about the performance of the operations of the first stage, coming from the output of block 7, about the availability of technological parameters - the first stage, coming from the output of block 6, about the location of the device at this (first) stage (from the output of the decoder 2), ensures the formation at the output of block 5 of the readiness logic to execute the next stage. This signal, passing through the prohibition block 10, switches the block 1 of the stage counter to one (regular) stage. At the same time, on the same signal from the output of the prohibition block 10, the timer is reset and the time of the next (second) stage begins. The signal from the output of the decoder 2 includes the actuator of the next (second) stage in block 8 of the actuators. Further, the process is repeated as indicated. After switching over the counter of 1 stages and the decoder 2 to the next (second) stage, the readiness signal at the output of logic block 5 disappears, since there is still no confirmation of the operations of the second stage FROM the 7 position sensor unit. This signal is generated in block 7 after the operations of the second j under the action of the actuators of the second stage of block 8.

If during the operation of any stage of the program these operations are not performed within the time set for this stage and determined by the combination of signals from timer 9 and decoder 2 (stage signal), then under the action of a time signal coming from the timer 9, a prohibition signal is generated at the first output of the control and indication unit 4, which is fed to the second input of the timer 9, prohibiting its further work on timing, and to the second input of the block 1 of the stage counter. Due to this, no operations can be performed in the device, since it is prohibited to switch the block 1 of the stage counter

The control unit A generates a time exceeding signal as follows. For each step, time is known, for example, the maximum travel time of the valves. At the beginning of each stage, the timer is reset to its original state.

o

five

0

five

5 0 5 0

five

0

Then the 11th time begins. If the valve for a given control command is set for a specified time, the next stage begins and the timer is reset to its original state and a new countdown of the next stage begins. If the command to control is not executed, then on the precept time cell, the stage and time signals coincide, indicating that the time of the stage has been exceeded.

The prohibition signal is displayed in the control and indication unit 4, warning the operator to stop the program for exceeding the time of the stage.

Since the execution time of operations at different stages is different, each stage signal from decoder 2 corresponds to its own time signal from timer 9. This ensures the selectivity of monitoring the duration of each stage.

Continuation of the program after stopping the program to exceed the time of the stage is possible after elimination of the cause of the suspension (after the argument of the actuators that have not reached the end positions that correspond to the execution of the program of the stage). In this case, at the inputs of the logic block 5, the conditions for performing the next stage are formed, the ready signal from the output of the block 5. Through the block 10, the inhibit arrives at the first input of timer 9, swaddles it and removes the time exceeding signal from the first input of the control and display unit 4. Next is the normal procedure for executing the program.

If the operation of the stage is completed within a specified time, which does not exceed the time that comes from timer 9 to block 4 and corresponds to this stage, then block 5 of the logic affects the counter of steps 1 and the decoder 2 through the prohibition block 10 and proceeds to perform operations following | Stage with simultaneous regeneration of the timer, as described above.

If, when performing operations of any stage of the program, the signals of technological parameters in the block of 6 sensors of parameters that should take place at this

step, in block 4 of control and indication, a signal of a third input is generated by a signal from the third input, which is sent to the second input of block 10, prohibiting the command to the first input of the stage 1 counter. The reason for the prohibition is indicated in the control and display unit 4, as a parameter mismatch at this stage. The continuation of the program in this case is possible only when the signal from the output of the block 6 of parameter sensors arriving at the third input of block 4 is removed. At this, the inhibit command from the monitoring and display unit 4 to the input of the inhibitor block 10 is eliminated.

In order to proceed to the next stage, the control command must be necessarily executed, for example, the valve is closed manually. In this case, the readiness signal appears in the logic block 5, by which the timer is reset via the LO block, due to which the time signal disappears on the coincidence cell in the control and indication block 4, and the prohibition is removed from the 1-stage counter.

Separation of prohibition signals to continue the program depending on the reason for the prohibition (exceeding the time of the stage or inconsistency of the meter) makes it easy to determine the reason for the prohibition and also to easily start the device to continue the program after eliminating the reason for the suspension.

Thus, the reliability of the device is increased by the fact that the first output of the control and indication unit is connected to the second inputs of the timer blocks and the phase counter. This prevents the switching of the counter of steps from a random interfering signal and stops the timer operation after the occurrence of a signal that exceeds the step time. The reason for stopping the program is indicated in the control and display unit.

Expansion of the functionality of the device is achieved by connecting the first block of parameter sensors to the third input of the monitoring and display unit, the second output of which is connected to the second input of the prohibition block, the output of which is connected to the first input.

O stage counter and the first timer input, as a result of which it is possible to monitor the state of technological parameters at each stage, regardless of the duration of the stage operations and when a parameter disappears, an instantaneous stop of the program with indication of the reason for the stop occurs (due to the parameter mismatch)

0

Claims (1)

Formula of Invention Device for software control containing control unit 5 and indications, a timer, a first block of parameter sensors, a block of the ban and a stage counter block connected in series, a decoder, a control command generation unit and 0. block of actuators, the output of which is connected to the input of the second block of position sensors connected by the output with the first input of the logic block, the second input of which 5 is connected to the output of the decoder as well. the third input is connected to the output of the first parameter sensor block, the timer output is connected to the first input of the block. Control and indication, the second one is Ko0; Togo is connected to the output of the decoder, characterized in that, in order to increase the reliability of the device, the first block output control and indication connected to 5 with the first input of the inhibit block, the second output with the first input of the timer and the counter block, the second inputs of which are connected to the output of the inhibit block, the second input of which is connected to the output of the logic block, and the output of the first sensor block of parameters is connected to the third input of the control and display unit . Compiled by And, Shvets Editor M. Dllsh TehredO.Gortvay Proofreader Oh, Lugov Order 3289/47 Circulation 836 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. d. D / 5 Production and printing company, Uzhgorod, st. Project, 4