SU1280417A1 - Device for counting piece articles - Google Patents

Abstract

The invention relates to the field of computing and information technology and is intended for automatic counting in a discrete manufacturing process control system. The aim of the invention is to improve the reliability of the device by continuously monitoring its performance. The device for counting piece goods contains a sensor, the output of which is connected to the first input of the comparator, the output of which is connected to the first inputs of the AND and OR-NOT elements and to the input of the delay element whose output is connected to the second input of the comparator and the impulse generator ov, the output of which is connected to the second inputs of the elements AND and OR-NOT, the outputs of which are respectively connected to the first and second inputs of the discriminator of the pulse duration, the first output of which is connected to the input counter and the second is output Avarin device. When a device (sensor or comparator) fails, signal 1 appears at the output of Avariya. In (O control mode, the output of pulses occurs at the output of the comparator, which are blocked to pass to the counter and output of Avari. the pulses are stopped and a single pulse passes to the input of the counter. 3 Il.

Description

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The invention relates to a computing and information technology, and is intended for automatic counting and discrete production process control systems.

The purpose of the invention is to increase the reliability of the device by continuous monitoring of its performance.

FIG. 1 shows a block diagram of the device; in fig. 2 - examples of the implementation of the discriminator signal duration; in fig. 3 - temporary work diagram.

The device comprises a sensor 1, a comparator 2, an OF element, a counter 4, an OR-NOT 5 element, a signal delay element 6, a reference voltage source 7, a pulse shaper 8, and a signal duration discriminator 9.

The discriminator 9 of the signal duration may contain, for example, two identical circuits consisting of delay elements 10 and AND elements 11 (Fig. 2).

 The device works as follows.

In the absence of the product in the working area of the sensor 1 and in the presence of a device supply voltage, the reference voltage source 7 is initially set to a state in which a comparator setpoint is low at its input-setpoint. Moreover, this level is chosen such that it is less than the signal from sensor 1 in the absence of a registered product. At the output of the sensor in the absence of a registered product, there may be both a signal affecting the ambient sensor (illumination for photo sensors) and a signal from the sensor itself (smoothed white noise). When the comparator 2 setpoint is low, it triggers, but the low level at the setpoint input of comparator 2, formed by the imaging unit 8, blocks its passage from the output of comparator 2 to the input of counter 4. At the output of the OR-NOT element, the Avari signal is also not generated. the input of the element OR NOT 5 there is a high level from the output of the comparator 2. The high potential at the output of the comparator 2 through the signal delay element 6 enters through the time at the input of the source of supports72

This voltage is higher than the noise level and is determined in accordance with the requirements for separating the signal from sensor 1 from the product. At the output of the comparator 2 a low level is formed. Thus, the comparator 2 continuously generates rectangular pulses with a frequency of 1/2 and a duty cycle of 2. These pulses are blocked by an AND 3 element to pass to the input of counter 4 and an OR-NOT 5 element to the Avar output, short pulses that occur during switching the comparator 2 and the driver 8 are blocked by the discriminator 9, the signal duration, since the duration of these pulses is less than the time specified by the delay elements 10.

If the device fails (no noise from sensor 1 or the comparator 2 fails, delay element 6, pulse shaper 8), when a low level reference voltage is set at the output of source 7, comparator 2 does not appear at the output of the OR element NOT 5 forms a low level, which causes the Avarion signal to form at its output.

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When appearing in the workspace

Claims (2)

The sensor 1 of the product generates a signal at its output, which causes the comparator 2 to be in a single state regardless of its setting. After a time delay cG, a high level appears at the output of the reference voltage source 7 (if its output was previously at a low level) and a counting impulse comes through the AND 3 element to the input of the counter 4. It is registered by the counter 4, since its duration exceeds the discrimination duration of the discriminator 9. Until then. As long as the comparator 2 is in the single state at its high setpoint, generation in the system is excluded. When the signal from the output of sensor 1 disappears at the output of the comparator 2, a low level is established, which, through time delay element 6, switches the voltage source 7 to a low voltage after a time. This starts the generation process at the comparator output 2. Thus, due to the constant switching of the setpoint of the Comzarator 2 from a low level to a high one and vice versa, the device performs a permanent performance monitoring based on monitoring the presence of these fluctuations. When there is a signal from the sensor 1 on the product, the comparator 2 sticks to a high level, which is recorded by the counter 4 as the advanced product. As a result, the reliability of the device increases. Claims A device for counting mental products, comprising a sensor, an output of which is connected to the first input of the compiler, a counter, a delay element, an AND element, characterized in that, in order to increase the reliability of the device by continuously monitoring its operability, a pulse shaper is inserted into it , the source of the reference voltage, the element 1-SHI-NOT and the discriminator of the duration of the signal, the output of the comparator is connected to the first inputs of the AND and OR-NOT elements and to the input of the delay element whose output through the source the voltage is connected to the second input of the comparator and the input of the pulse generator, the output of which is connected to the second inputs of the AND and OR-NOT elements whose outputs are respectively connected to the first and second inputs of the discriminator of the pulse duration, the first output of which is connected to the counter input, the second output of the duration discriminator pulses is the output of the device. Fyg. DMD setpoint comparator Ying (rum 8 move KQtanapa torus Comparator output I’m leaving me Output al-ta "W-T / f