JPS6389934A - Noise prevention system for machine control - Google Patents

Abstract

PURPOSE:To discriminate noise easily, reduce cost and improve reliability of an automatic machine by providing an interrupt pulse oscillator that shifts a receiving element, a storing element of input signal and a signal periodically in the storing element. CONSTITUTION:Input signals are received by a receiving element 1 and stored by a storing element 2, and at the same time, shifted in the element 2 through an interrupt pulse oscillator 3. That is, input signals n1-nm are received the element 1 and stored in LSB (Bit 0) of designated address of the element 2. Input signals stored in the element 2 are shifted to the left by the oscillator 3 at all times. For instance, supposing that period of interruption is 10ms, it can be judged at high probability that input signals held the level of 1 during 20-30ms when all of bits 1, 2, 3 are 1, and can be distinguished easily from noise signals inputted in edge-like form. As noise can be discriminated easily by software, cost can be lowered reducing material expenses etc., and at the same time, reliability of an automatic machine can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control method using a combinatorial unit, and particularly to a noise prevention method in machine control.

[Conventional technology]

Conventionally, in a machine control device using a microconbeater, measures to prevent input signals from sensors and operating devices include hardware measures to prevent noise signals from being injected into the input signal line, or measures to prevent minute time signals such as noise signals. Measures were taken to prevent any reaction.

[Problem that the invention seeks to solve]

The above method had the drawback that since it was handled in terms of hardware, there was always a cost of materials for purchasing parts, man-hour costs for arranging the parts, and costs for evaluating noise resistance. Means] The noise prevention power type of the present invention has a receiving element for an input signal, a memory element for storing the contents of the signal, and an interrupt pulse oscillator that serves as a trigger to periodically foot the signal in the memory element. It is designed to solve all the problems at once.

〔Example〕

Next, the present invention will be described in detail with reference to drawings of embodiments. As shown in FIG. 1, an input signal is once received by a receiving element 1 and then stored in a storage element 2.

FIG. 2 shows the details inside the memory element, and FIG. 3 shows the interrupt pulse and the concept of time.

Next, the software mechanism of the present invention will be explained. Input signals n1 to nm shown in FIG. 2 are received by the receiving element 1 and always stored in LSB (BitO) of the designated address of the storage element 2. - The input signal stored in 10,000 storage elements is always left shifted by the interrupt pulse. Temporarily set the interrupt cycle to 10
If m5 is Bitl.

2. When all 3 are "1", the principal power signal is 20 to 3
It can be determined with a high probability that the level of ""1" was maintained for 0 m5, and it can be easily distinguished from the noise signal input in the shape of an edge.

In FIG. 3, T indicates the time point at which the input signal is determined.

〔Effect of the invention〕

As explained above, the present invention can easily determine whether an external input signal is due to noise or not without any troublesome hardware measures, thereby greatly reducing material costs and evaluation adjustment man-hours. As a result, costs are reduced.

It also has the effect of improving the reliability of automatic machines.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a simple embodiment of the present invention, FIG. 2 is a detailed view of the storage element shown in FIG. 1, and FIG. 3 is a detailed view of the interrupt pulse shown in FIG. 1. ]...Input signal receiving element, 2...Input signal memory 1 st 7δB 13B7t! ;43
2/ θ scrap 2 figure

Claims (1)

[Claims] In a control method in which a computer controls a machine according to a predetermined program, input signals from a sensor that monitors the position, speed, temperature, etc. of the device and an operating device that instructs the device to operate are continuously transmitted through periodic interruptions. A noise prevention method for machine control that monitors signals and recognizes whether they are normal signals or noise.