SU1167574A1 - Electronic time device - Google Patents

Abstract

ELECTRONIC TEMPORARY. THE DEVICE WITH DETECTION OF FAILURES, containing a wired generator, a binary pulse counter, i. element SH-N and RS-trigger, and the output of the master oscillator is connected to the first input of the two-input element And, the second input of which is connected to the direct output of the RS trigger, the output to the input of the binary counter, the outputs The arcs of which are connected to the corresponding inputs of the multiple input element OR, the output connected to the first input of the two-input element SHSh-NOT, the second input connected to the output of the initial setup, with the R input of the R6 trigger and the installation inputs of the binary counter and the former, and the output - with a 5-input RS-transfer switch, with the output of the binary account: chick connected to the input of the driver.

Description

The invention relates to temporary devices and can be used in discrete automation systems.

The effective electronic time devices that provide input to the executive command after a preset time or sequence of time intervals contain a master oscillator, a binary pulse counter (frequency divider), an output shaper, and an initial setup circuit.

In a number of cases, these devices do not satisfy the requirements for eliminating the possibility of premature execution of an executive team, i.e. the appearance of a signal at the device output as a result of a failure resulting from the storage or processing of the installation.

The closest to the proposed technical entity is a time interval sensor that contains a generator (a stable frequency geyrator), a binary pulse counter (frequency divider), an output driver (output device), an initial setting circuit (switching device), a delay device and a converter tension

A significant disadvantage of this sensor is the possibility of premature output of the output sign (executive command) as a result of failure, which reduces the counting factor.

The purpose of the invention is to increase the reliability of the device by detecting failure.

This is achieved by the fact that the composition of an electronic temporary device containing a master oscillator,

binary pulse counter, output signal generator, and initial setup scheme, a multi-input element ШИИ, a two-input element И, a two-input element are introduced

IPI-NOT and RS-trigger, and the output of the master oscillator is connected to the first input of the two-input element And, the second input of which is connected to the direct output of the RS-trigger, and the output - to the input of the binary counter, the outputs of the bits of which are connected to the corresponding inputs of the multi-input element OR, the output connected to the first input of the two-input element OR-NOT, the second input connected to the output of the initial setup, with the R-input of the R3 trigger and with the installation of 1 inputs of the binary counter and the former, and the output with the 5-input RS-three at the same time, the output of the binary counter is connected to the input of the driver.

The drawing shows a structural diagram of the proposed electronic temporary structure.

The electronic temporary device with failure detection contains a master oscillator 1, a two-input element AND 2, a binary counter 3 pulses, a shaper 4 of the output signal, a multi-input element OR 5, an R5 flip-flop 6, a circuit 7 of the initial installation and a two-input element ILI-HE 8,

The device with the detection of failures works as follows.

When the device supply voltage is turned on, the initial setup circuit 7 generates a pulse of the logic unit level, setting all bits of the counter 3, shaper 4 and K6 trigger 6 to zero. In case there are no 3 logical unit failures in the counter bits the time of action of the pulses of the initial installation. on all inputs and at the output of the multi-input element OR 5 ,. as well as at the first input of the two-input element OR-NO 8 is present, the level of logical zero. As a result, a single pulse of the initial installation is applied to the second input of the two-input element OR-NOT 8 at the output of this element and at the input of the S R5 trigger 6 there is a logic zero level. The signal output level is zero. The I-trigger 6, in the state of logical zero, arrives at the second input of the two-input element I 2 and prohibits the passage of pulses from the master oscillator 1 through the two-input element 2 to the counting input of the counter 3.

On the falling edge of the initial setup pulse, the signal at the second input of the two-input element OR NONE 8 passes from the level of logical one to the level of logical zero, which results in the appearance of a level of logical one at input 5 of the RS-Trigger 6. R5-trigger 6 switches to the state of logical unit and a single signal from its output, indicating that there are no failures of the type of logical unit 1 in the bits of the counter 3 at the time the pulse of the initial installation ends, allows the pulses from the master oscillator 1 to pass through the two-input element And 2 on . the counting input of the counter 3 and the installation testing. In the event that at least one failure is detected in the bits of counter 3, the type of logical unit in the multi-input element OR 5 appears at the level of a logical unit that ensures the constant presence at the input 5 of the RS RS-trigger of the logical zero level. After the expiration of the pulse of the initial installation, the RS-trigger 6 does not switch to a logical 1, 4, 4 units, as a result of which the installation test by a temporary device is prohibited. The use of the proposed electronic temporary device allows for a small amount of additional; equipment and significantly reduce the likelihood of premature issuance of an executive command by detecting failures of the type of logical unit in the bits of counter 3 that occur during storage of the device or when its power is turned on. The completeness of the control can be increased by introducing cont. the role of the logical state at the output of the formaker -4, for which the output of the imaging device 4 should be connected to the additional input of the multi-input element OR 5. The reliability of the temporary device is increased by the larger / larger the storage period of the device preceding its insertion and the smaller the setting in comparison with the hrieni period.

 m m f

-

Claims (1)

ELECTRONIC TIME. DEVICE WITH FAULT DETECTION, comprising a master oscillator, a binary pulse counter, an output signal shaper and an initial installation circuit, characterized in that, in order to increase reliability, due to fault detection, a multi-input element is introduced into it OR, two-input element-AND, two-input: OR-HE element and R5-trigger, the output of the master oscillator being connected to the first input of the two-input element And, the second input of which is connected to the direct output of the RS-trigger, the output is to the input of the binary counter, the discharge outputs of which are connected to the corresponding inputs of the multi-input OR element, the output connected to the first input of the two-input OR-HE element, the second input connected to the output of the initial setup circuit, with the R input of the trigger and with the setup inputs Q of the binary counter as well as the shaper, and the output - with the S-input of the RS-trigger, while the output of the binary counter is connected to the shaper input. SU „„ 1167574