JP3231251B2 - Watt hour meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic watt-hour meter for measuring the amount of electric power and the amount of reactive electric power used in power trading, and in particular, to measuring conditions such as an ID number and a synthetic metamorphic ratio. This is related to changing the setting of the unique information.

[0002]

2. Description of the Related Art FIG. 3 is an example of a block diagram of an arithmetic processing unit of a conventional electronic watt-hour meter. In the figure, reference numeral 1 denotes a CPU for performing various arithmetic processes, and 2 denotes a ROM for storing a program used by the CPU 1 and instrument-specific information such as an initial ID number and a composite transformation ratio. Its contents are written in advance.

[0003] Reference numeral 3 denotes a RAM for storing and reading out processing data of the CPU 1, 4 a setting operation unit for changing and setting various processing conditions for power amount measurement, 5 a display unit for displaying the measured value, and 6 an ID for example. An instrument-specific information setting unit 7 for setting instrument-specific information such as a number and a combined metamorphic ratio is a non-volatile memory for storing processing conditions even when power is not supplied to the arithmetic processing unit of the electronic watt-hour meter.

FIG. 4 is a flow chart showing the reading of the instrument-specific information of the arithmetic processing section of the conventional electronic watt-hour meter and the arithmetic processing performed based on the instrument-specific information.

Next, the operation will be described. (1) Instrument specific information (initial value) such as an ID number and a combined metamorphic ratio is stored in the ROM 2 in advance in the manufacturing process (step 200). (2) When power is supplied, it is checked whether the power is applied for the first time, for example, by checking the presence or absence of data in the non-volatile memory 7. If the power is applied for the first time, the ID number stored in the ROM 2 or the composite The instrument-specific information (initial value) such as the metamorphic ratio is read (step 201) and written to the RAM 3 (step 202).

(3) The CPU 1 executes a process of measuring the electric energy based on the instrument-specific information read from the RAM 3 in accordance with the program stored in the ROM 2 and displays the measured value on the display unit 5 (step 203). (4) To change the instrument-specific information, perform a setting change operation of the new instrument-specific information from the instrument-specific information setting unit 6;
The instrument-specific information whose setting has been changed is written to the RAM 3 (step 204).

(5) In order to store the changed instrument-specific information even after the power supply to the arithmetic processing unit is stopped, the data of the changed instrument-specific information is also written to the nonvolatile memory 7 (step 205). ).

(6) Returning to step 203 after writing, the CPU 1 starts RAM
The weighing calculation process is executed using the changed instrument-specific information stored in 3 and the process of displaying the weighed value on the display unit 5 is repeated. (7) Here, when the power supply is stopped once and the power is supplied again, the presence or absence of data in the nonvolatile memory 7 is checked, and if there is data, the power supply is determined to be the second or later power supply and the nonvolatile memory 7 is determined. Various processing data and instrument-specific information are read from the operability memory 7 and the data is written to the RAM 3.

In the same manner, the CPU 1 continues to operate the arithmetic processing with the instrument-specific information stored in the RAM 3, that is, the instrument-specific information at the time when the power was not supplied last time.

[0010]

Originally, the instrument-specific information is individual instrument-specific information such as an ID number and a composite metamorphic ratio, and should not be changed once set.
Or it must be something that cannot be easily changed.
(When used for toll transactions, if instrument-specific information is set and verified, if the data is changed after that, the metering operation will be different from the test state, so it will be necessary to re-verify.)

In the above configuration, when the instrument-specific information is changed, if the processing is performed using the instrument-specific information after the setting is changed from the time when the setting operation is performed, if the wrong instrument-specific information is set by an erroneous operation, an incorrect The calculation process is performed using the instrument-specific information, and the reliability of the processed data is lost. Further, there is a problem that even if a data repair operation is performed immediately after noticing an erroneous operation, the processed data during that time becomes erroneous processed data. In addition, when the instrument-specific information is changed, a fraction or the like in the middle of the processing up to that point is continued, and there is a problem that the reliability of the processed data is lost.

The present invention has been made in order to solve the above-mentioned problems. Even if incorrect instrument-specific information is set by an erroneous operation, the arithmetic processing during the current operation is not changed, and the arithmetic processing is continued with the instrument-specific information. In addition, it is an object of the present invention to increase the reliability of the processed data before and after the change of the instrument-specific information, by causing the changed instrument-specific information to be operated as new instrument-specific information when power is supplied again.

[0013]

A watt hour meter according to the present invention uses a CPU to calculate and measure a power amount based on meter-specific information such as an ID number and a combined metamorphic ratio, and displays the measured value. In the watt-hour meter of the formula, the initially set instrument-specific information is stored in a non-volatile memory, and when the meter-specific information is changed, the changed meter-specific information is stored in another non-volatile memory. When the power to the meter is turned on,
If there is the changed instrument-specific information in the another non-volatile memory, the metering operation is performed based on the changed instrument-specific information. The weighing operation is performed based on.

The display unit for displaying the weighed value may display at least one of the default instrument-specific information stored in the memory and the changed meter-specific information in another memory, or the weighed value may be displayed alone. It is a display unit for displaying or displaying the weighed value and at least one of the meter-specific information.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a block diagram of an arithmetic processing unit of the electronic watt-hour meter of the present invention. FIG. 2 is a diagram illustrating reading of instrument-specific information of an arithmetic processing unit of an electronic watt-hour meter according to the present invention;
It is a flowchart regarding the arithmetic processing performed based on this instrument specific information.

In the drawing, reference numerals 1 to 6 are the same as those described in the above conventional example. Reference numeral 8 denotes a non-volatile memory for saving the processing data when the power is turned off, and 9 denotes a non-volatile memory for storing the instrument-specific information set by the setting operation unit 6.

Next, the operation will be described. (1) When power is supplied (power is turned on), the CPU 1
The data in the non-volatile memory 9 is read, and it is checked whether or not there is storage of instrument-specific information such as an ID number and a combined metamorphic ratio, and it is determined whether or not the power is supplied for the first time (step 101). Here, in the initial stage in which the nonvolatile memory 9 has not operated at all in the past, the data is, for example, all bits “1”.
Is set, if all bits are "1", it is determined that there is no instrument-specific information, and this is determined to be the first power-on.

(2) When the power is turned on for the first time, the CPU 1
The instrument-specific information (initial value) preset according to the program stored in the OM 2 is written in the nonvolatile memory 9 (steps 102 and 103). (3) Further, the instrument-specific information (initial value) is also written in the RAM 3 (step 104).

(4) In the steady state, the CPU 1
3, the meter-specific information is read out, the weighing process is executed according to the program stored in the ROM 2 with reference to this data, and various data such as weighed values are displayed on the display unit 5 (steps 105 and 106). (5) If the instrument-specific information is to be changed, a setting change operation is performed from the instrument-specific information setting unit 6, and the instrument-specific information is written to the nonvolatile memory 9 (step 107).

(8) If the power is not turned off (step 10
8) Since the CPU 1 is executing the arithmetic processing with the instrument-specific information stored in the RAM 3, the CPU 1 continues the processing with the instrument-specific information before the setting change (circulation of steps 105, 106, and 108). Therefore, even if new instrument-specific information is input from the instrument-specific information setting unit 6, it does not affect the processing being executed.

Here, a method of operating with the changed instrument-specific information will be described. (1) First, supply of power is temporarily stopped (step 10).
8), (2) Supply power again (step 100). (3) Once the power supply is stopped, various processing data is saved in the nonvolatile memory 8 (step 109).

(4) When power is supplied for the second time or later, it is checked whether or not there is instrument-specific information in the non-volatile memory 9 and the operation after the first power supply is performed.
Since the information unique to the instrument is written in the non-volatile memory 9, it is determined that "data exists", and the instrument unique information stored in the nonvolatile memory 9 is written to the RAM 3 (step 110). The instrument-specific information at this time is the instrument-specific information whose setting has been newly changed. (5) The CPU 1 executes arithmetic processing using the instrument-specific information newly stored in the RAM 3, that is, the instrument-specific information after the setting is changed (step 105 and thereafter).

Since the configuration is as described above,
Even if incorrect instrument-specific information is set due to an erroneous operation, the arithmetic processing during the current operation is executed and weighing with incorrect metric-specific information is prevented unless the power is turned on again.

Embodiment 2 FIG. In the operation of changing the setting of the instrument-specific information, the data is displayed on the display unit 5 while the setting is being performed by the instrument-specific information setting unit 6, and from the time when the setting change is completed, the data currently being written into the RAM 3 is being processed. By reading and displaying the instrument-specific information, the instrument-specific information currently being processed and the instrument-specific information after the setting change can be easily identified on the display unit 5.

That is, since the meter-specific information before and after the setting change can be confirmed, a check after the setting operation can be performed, and erroneous operation can be prevented.

[0026]

As described above, according to the present invention, if the changed meter-specific information is in the nonvolatile memory when the electronic watt-hour meter is powered on, the changed meter-specific information is used based on the changed meter-specific information. If the meter operation is performed and the changed instrument-specific information is not in the non-volatile memory, the weighing operation is performed based on the default setting of the instrument-specific information. As long as the power is not turned on again, the arithmetic processing during the current operation is executed as it is, and measurement with incorrect instrument-specific information is prevented.

In addition to displaying the amount of power being measured, the meter-specific information during the current weighing operation and the changed-meter-specific information can be displayed, so that the two can be compared and the presence or absence of the change input can be determined. It can be easily confirmed.

[Brief description of the drawings]

FIG. 1 is a block diagram of an arithmetic processing unit of an electronic watt-hour meter according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart of an operation of an arithmetic processing unit of the electronic watt-hour meter according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a calculation processing unit of a conventional electronic watt-hour meter.

FIG. 4 is a flowchart of an operation of a processing unit of a conventional electronic watt-hour meter.

[Explanation of symbols]

1 CPU, 2 ROM, 3 RAM, 4
Setting operation section 5 Display section, 6 Instrument-specific information setting section, 7, 8, 9
Non-volatile memory.

Claims (2)

(57) [Claims] 1. An electronic watt-hour meter for calculating and measuring an electric energy using a CPU based on instrument-specific information such as an ID number and a combined metamorphic ratio, and displaying the measured value. Is stored in a non-volatile memory, and when the meter-specific information is changed, the changed meter-specific information is stored in another non-volatile memory. If there is changed instrument-specific information, the weighing operation is performed based on the instrument-specific information.If there is no changed instrument-specific information in the other non-volatile memory, the weighing operation is performed based on the initially set instrument-specific information. A watt hour meter. 2. The watt hour meter according to claim 1, wherein the display unit for displaying the weighed value displays at least one of the default instrument specific information stored in memory and the changed instrument specific information in another memory. Or a display unit for displaying the measured value alone or for displaying the measured value and at least one of the meter-specific information.