SU408151A1 - DEVICE FOR ALARMING THE LIMIT VALUES OF PARAMETERS - Google Patents

Description

one

The invention relates to instrumentation technology and can be used in various multipoint control devices with information output to the screen of a cathode ray tube.

A device for signaling parameter limit values is known, comprising a control unit associated with control inputs of a setpoint switch and a switch, the output of which is connected to a parameter marking unit and one input of a zero authority, the other inputs of which are connected to setpoint switch outputs and blocks control and program control, the unit of settings of the upper and lower limits of the parameters and the video control unit.

A disadvantage of the known device is that the determination of a parameter that has passed the permissible limits is carried out using special individual indicator devices, which complicates the device and reduces the reliability and efficiency of operator control.

The purpose of the invention is to extend the functionality of the device, namely to provide an alarm for a parameter to move beyond the upper and lower limits by highlighting this parameter directly on the screen of a video monitor.

To achieve this goal, a switch unit, a pulse inhibitor driver and a inhibitor circuit are additionally introduced to the device, the switching unit is connected to the block of settings for the upper and lower limits of parameters, the setpoint switch and the software control unit, and the outputs of the inhibitor pulse generator are connected to the outputs of the unit the control and the zero-organ, and the output through the prohibition circuit, the control input of which is connected to the output of the parameter marker generator unit, is connected to the video monitoring unit.

The drawing shows a block diagram of the proposed device.

The device contains sensors 1 and 2, switch 3, block 4 of the settings of the upper and lower

limits, switching unit 5, software control unit 6, setpoint switch 7, control unit 8, null organ 9, inhibitor pulse generator 10, inhibitor circuit 11, video monitoring unit 12,

block 13 for forming parameter marks. The device works as follows. At the time of the start of the sweep p frame, a pulse coming from the program control unit 6, submission from the block 4 of the upper and lower limits settings through the switching unit 5 to the inputs of the switch 7 is given set values for the entire sweep time of this frame of the settings from the lower limit adjusters, i.e. monitoring of the lower limits of the parameters is carried out. From the output of the switch 7, the signals of the installations are fed to one of the inputs of the nullorgan 9. At the same time, signals from sensors 1 and 2 are fed to the other input of the nullorgan and to the input of the device 13.

The zero-organ circuit 9 is constructed in such a way that the signal to the input of the inhibitor impulse generator 10 comes from the same zero-organ arm, where the equal voltage signal of the sensor and the upper or lower limits are set, depending on what limit is controlled by given time span. The switching of the outputs of the null organ 9 is carried out using electronic switches controlled by pulses taken from the output of the software control unit 6 and synchronously with the switching moment of the switching unit 5.

To eliminate the influence on the clarity of the null-organ 9 possible difference in the phases of the pulses arriving at its inputs, a polling pulse is introduced to the null-organ from the control unit 8 and shifted in phase with respect to the leading edge of the control pulse. Switches 7 and 3 operate synchronously and in phase. The synchronization is carried out by the leading edge of the control pulses coming from the control unit 8.

When a parameter goes beyond the lower limit before the start of the frame sweep, then after a zero-body 9 is supplied to the input from the sensor of this parameter and the voltage corresponding to the lower limit setting, at the moment the polling pulse is applied, the zero-body triggers its controlled output will receive a signal that changes the state of the driver 10. The low level of the signal taken from the output of the driver 10 closes the inhibitor circuit 11, preventing the flow of the parameter mark from the formation block 13 parameter marks to the input of the video monitoring unit 12. Thus, at this moment, the parameter mark will not be displayed on the screen of the cathode ray tube.

The return of the inhibitor pulse generator 10 to the initial state, in which the inhibitor circuit 11 is open, is carried out by the falling edge of the control pulses.

At the start of the sweep (d + 1) frame, the frame sweep pulse arriving at the input of the program control unit 6, which is a controlled frequency divider, translates it into the state at which the inputs to the switch 7 are connected for the entire time of the set frame sweep from the setters of the upper limits of the switching unit 5. Then, at the exit of the nullorgan 9, a signal appears only if any of the parameters exceeds the upper limit. Since the parameter previously considered to leap beyond the lower limit, then at the moment the switch switches around this parameter, the switch 7 corresponding to this parameter will not set the upper limit of the pulse selection at the output of the zero authority 9. The impulse of the parameter mark from block 13 will freely pass through the prohibition scheme 11 on the input of the video monitoring device 12, i.e. the mark of this parameter will be illuminated. When you scan () a frame, the illumination of the indicator band of the parameter will not occur, that is, the circuit in this case works in the same way as scanning the frame. The signaling of the transition by the parameter of the upper limit is carried out similarly. Thus, the selection of a parameter that is outside the allowable limits on the screen of the video monitor device 12 is carried out by flashing the indicator strip. By changing the division rate of the frame pulses by the software control unit 6, you can set the desired blink rate.

Subject invention

A device for signaling parameter limit values, comprising a control unit associated with control inputs of a setpoint switch and a switch, the output of which is connected to a parameter mark generation unit and one input of a zero authority, the other inputs of which are connected to setpoint switch outputs and control units and software control, a unit of settings for the upper and lower limits of parameters and a video monitoring unit, characterized in that, in order to expand the functional capabilities of the device, it additionally introduces a switch unit, a pulse inhibitor driver and a inhibitor circuit, the switching unit associated with the upper and lower parameter settings block, the setpoint switch and the program control unit, the inhibitor pulse driver inputs are connected to the outputs of the control unit and the zero-organ, and the output through the inhibitor circuit, the control input of which is connected to the output of the parameter marker driver unit, is connected with the video monitoring unit.