JPH09257557A - Load cell type scales - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit the accurate data between a load cell unit and an indicating unit without generating a change of the data in a load cell type scale. SOLUTION: This scale has a load cell unit 11, which can transmit the weight data of a different time, and an indicating unit 12 for receiving this weight data and for performing any one of data processing and display. The load cell unit 11 can transmit plural weight data d1-dn within a constant cycle. The indicating unit 12 has plural data buffers 1-(n) corresponding to the number of the data d1-dn from the load cell unit 11 and a comparing unit 20 for comparing the content of these data buffers 1-(n), and results of the comparison and the computing are processed as the transmission data D is this cycle.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a load cell type balance.

[0002]

2. Description of the Related Art In a load cell type balance, a load cell is provided in a weighing section to form a load cell unit.
An output signal corresponding to the load applied to the load cell unit is transmitted to the instruction unit for display and data processing in the instruction unit. The load cell generally outputs an analog signal.

In some conventional load cell type scales, an analog signal from the load cell is transmitted to an instruction unit, and the instruction unit performs signal processing on a temporally continuous analog signal, which is temporally processed. Converted to discrete digital weight values. And for other types,
Perform the above digitization process in the load cell unit,
The time-discrete digital signals are transmitted to the indicating unit, and the indicating unit displays the value as it is or provides it for data processing.

[0004]

In the latter one, which transmits a signal digitized in the load cell unit to the instruction unit, the transmission data is largely "when the data transmission path has some abnormality such as noise. Garbage "
There is a possibility that it will end up. As a result, there is a problem in that the display and data processing on the instruction unit are adversely affected.

Therefore, the present invention solves such a problem and makes it possible to transmit accurate data between the load cell unit and the instruction unit by eliminating the above "garbage" of data as much as possible. With the goal.

[0006]

In order to achieve this object, the present invention provides at least one of a load cell unit capable of transmitting temporally discrete weight data, and processing and displaying the weight data by receiving the weight data. The load cell unit is capable of transmitting a plurality of weight data within a fixed period, and the instruction unit includes a plurality of data buffers corresponding to the number of data from the load cell unit. Along with this, means for comparing and calculating the contents of these data buffers and processing the result as received data in that cycle is provided.

With such a configuration, it is possible to detect the occurrence of an abnormality by comparing and calculating a plurality of data in the data buffer. Therefore, unless the same data anomaly occurs consecutively over the above-mentioned multiple times, the occurrence of the anomaly is reliably detected, and "garbage" in the received data
The occurrence of noise is prevented, and accurate data data transmission becomes possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration of a load cell type balance according to the present invention. This scale has a load cell unit 11 in which a load section is equipped with a load cell, and an instruction unit 12 for displaying the value of the load applied to the load cell unit 11.
11 and instruction unit 12 are connected to each other via a transmission line 13.

The load cell unit 11 is provided with a data output section 15 for sending out digital weight data discretely in time to the transmission line 13, and a main control section 16. Data output section
15 is capable of outputting a plurality of weight data within a fixed cycle.

On the other hand, the instruction unit 12 includes a data input section 18 for inputting data from the load cell unit 11 via the transmission line 13 and a plurality of data corresponding to the number of weight data output from the load cell unit 11. Buffer 1
A data buffer unit 19 for storing the data when n is provided, a comparison unit 20 for comparing the contents of a plurality of data buffers 1 to n in the data buffer unit 19, and a main control unit 21 are provided.

In such a structure, the data output section 15 of the load cell unit 11 is n times (n ≧ n) within a fixed period.
2) That is, n pieces of data d1, d2, ..., dn are transmitted to the instruction unit 12. In the instruction unit 12, these data are input via the data input unit 18, and these n pieces of data d1, d2, ...
Store in 19 data buffers 1-n.

Then, the comparator 20 compares the contents of the data buffers 1-n after a lapse of a predetermined time within a fixed period or after receiving data a predetermined number of times. As a result of the comparison, if the predetermined condition is met, the data at that time is sent to the main control unit 21 as the reception data D in the cycle. If the comparison result does not match the predetermined condition, it is determined that the data is abnormal, the data is not utilized, and the reception data is processed as if there was no reception data in the cycle. Then, after clearing the data buffers 1 to n, the same operation is repeated.

Next, the details of the above-mentioned "condition" will be described. For example, the load cell unit 11 transmits n identical weight data to the instruction unit 12 within a fixed period,
This is stored in the data buffers 1 to n. At this time, if the n pieces of data d1, d2, ..., dn in the data buffers 1 to n are all the same, it is determined that no abnormality has occurred in the transmission path such as the transmission line 13, and the data is cycled. It is adopted as the reception data D in. On the contrary, if all the contents of the data buffers 1 to n are not the same, it is determined that some abnormality has occurred in the transmission path, and it is assumed that there is no received data in that cycle. By doing so, as long as the same abnormality has not occurred consecutively n times in all n data, "garbage" in the data can be found. Therefore, it is possible to reliably obtain the reception data D without any abnormality.

As another method, for example, n individual pieces of data are transmitted from the load cell unit 11 to the instruction unit 12 within a certain period and stored in the data buffers 1 to n. Then, the maximum value and the minimum value of the n pieces of data d1, d2, ..., dn are selected, and if the difference between the maximum value and the minimum value is within a certain reference value, the n pieces of data d1, d2. , ...
The average value of dn is adopted as the reception data D of that cycle.
On the other hand, if this difference exceeds the reference value, it is determined that some abnormality has occurred in the transmission path, and it is assumed that there is no received data in that cycle. By doing this, it is possible to detect "garbage" in the data as well.

When the difference between the maximum value and the minimum value of the data is taken in this way, the maximum value and the minimum value are obtained during the transition period when the load is acting on the load cell unit 11 and the subsequent stable data. By changing the setting values of and, it is possible to improve the certainty of detecting an abnormality. That is, even in normal data, the fluctuation range is large in the transition period, so the reference value for the difference between the maximum value and the minimum value is set to a large value. By setting it, it is possible to detect an abnormality in response to each situation.

The distinction between the transitional period and the stable period is performed, for example, as follows. That is, in the load cell unit 11, if the difference between the i-th data and the (i-1) th data is taken, the value of the difference indicates the presence or absence of variation between data and its magnitude. Therefore, if this difference value is attached to the weight data transmitted to the instruction unit 12, it becomes possible for the instruction unit 12 to determine how the data changes, that is, the fluctuation period or the stable period.

[0017]

As described above, according to the present invention, the load cell unit is configured to be able to transmit a plurality of weight data within a fixed period, and the instruction unit corresponds to the number of data from the load cell unit. Since a plurality of data buffers are provided, and means for comparing and calculating the contents of these data buffers and processing the result as received data in the cycle,
By comparing and calculating a plurality of data in the data buffer, the occurrence of abnormality can be detected, the occurrence of "garbage" in the received data can be prevented, and accurate data data transmission between units can be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a load cell type balance according to the present invention.

[Explanation of symbols]

 11 Load cell unit 12 Instruction unit 13 Transmission line

Claims (7)

[Claims] 1. A load cell unit capable of transmitting temporally discrete weight data, and an instruction unit for receiving the weight data and performing at least one of data processing and display thereof, the load cell unit comprising: It is possible to transmit a plurality of weight data within a fixed period, and the instruction unit is provided with a plurality of data buffers corresponding to the number of data from the load cell unit, and the contents of these data buffers are compared and calculated. , A load cell type balance having means for processing the result as received data in the cycle. 2. The load cell unit transmits a plurality of the same weight data within a fixed period, and if the plurality of data in the corresponding data buffers are all the same, the data is adopted as the reception data of the period. The load cell type balance according to claim 1. 3. The load cell type balance according to claim 2, wherein when a plurality of data in the data buffer are not all the same, it is processed as if there was no received data in the cycle. 4. The load cell unit transmits a plurality of weight data within a fixed period, and if the difference between the maximum value and the minimum value of the plurality of data in the corresponding data buffer is within a reference value, the plurality of data is stored. 2. The load cell type balance according to claim 1, wherein an average value of is adopted as the reception data of the cycle. 5. If the difference between the maximum value and the minimum value of a plurality of data in the corresponding data buffer exceeds a reference value, it is processed as if there was no received data in that cycle. Load cell type scale described in 4. 6. A difference between certain data within a certain period and data immediately before this data is obtained, and the presence or absence of variation in the plurality of data and the magnitude of the variation are determined from the magnitude of this difference. 5. The method according to claim 4, wherein
Or the load cell type balance described in 5. 7. A reference value for the difference between the maximum value and the minimum value is set and changed based on the magnitude of the difference between a certain data and a data immediately before this data within a fixed period. The load cell type balance according to claim 6, which is characterized in that.