JPH0272454A - Nonvolatile memory - Google Patents

Abstract

PURPOSE:To enable a nonvolatile memory to semipermanently hold the data together with improvement of the reliability by storing plural pieces of same data into an IC memory and reading/writing these data in plural times. CONSTITUTION:In a data writing state, plural words are used and each word is written into a memory means 36 via a writing means 34 so as to secure the data and a complement of '1' of the data. Then a reading means 35 reads out each of those written words. A data deciding means 37 decides whether one word is equal to the data and the complement of '1' or not. Then a data reference means 38 decides whether the coincidence is obtained between the written data and the read data or not. If not, an arithmetic process means 31 gives the writing instructions to the means 34 in the prescribed frequency via a rewrite counting means 39. In a data reading state, each word is read out and the normal data is written by the means 34 for each word with which the abnormal data is detected only in the case both normal and abnormal data are mixed in the same block. Thus it is possible to improve the reliability and to ensure the semipermanent application for a nonvolatile memory.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a nonvolatile storage device used in a transmission control device between devices arranged in a distributed manner.

Conventional technology In recent years, multiple devices have been centrally controlled, and transmission control methods have been introduced in which each device is connected via an electrical communication network and control signals are transmitted to each other for the purpose of monitoring the current status of the device. There have been various reports.

-For example, to control the load in a general household, the commercial
There is a method of using a V power line as a transmission communication path. This superimposes a communication signal voltage at a sufficiently higher frequency on the AC voltage of the power line to enable communication between each device.
Since no special wiring for control is required, the effort and cost associated with installation are low.

Here, the equipment refers to the load to be controlled and the load state detection function that detects the state of the load.
A device that combines a terminal device that has a load control function that controls whether the device is energized or de-energized (hereinafter referred to as OFF), a communication function that sends and receives control signals to and from other devices, and a self-address setting function. Another type of device is the communication function that sends and receives control signals to and from each device, the control signal generation function that generates 0N10FF control signals to be transmitted to each device, and the display that shows whether each device is in the ON or OFF state. There is a control device that has a monitor display function, a partner station address setting function corresponding to each device, and a own station address setting function.

A transmission control method using a power line will be described below with reference to the drawings.

FIG. 4 is a block diagram of a conventional transmission control method using electric power lines. 1 is a commercial 100V electric light line, which is found in a general household. Each device 8.9 is a combination of a load 4.6 and a terminal device 2, 3, and is connected to the power line 1. As mentioned above, the terminal device 2.3 has a load state detection function, a load control function 1 communication function, and a self-station address setting function, and can detect and control the QNloFF of the loads 4 and 6 combined with itself. It communicates with other devices using the power line 1 as a transmission communication path.

At this time, it is the own address setting means 6 and 7 that sets the own address. On the other hand, the control device 10 is a type of device, and is connected to the power line 1, and has a communication function, a control signal generation function, a monitor display function, a self-station address setting function, and a partner-station address setting function as described above. Reference numeral 11 denotes a local address setting means. Then, by pressing the load control switch 16 to 19 corresponding to the load to be controlled, the control device 10 sends a zero
Send the N10FF control command with your own station address attached.

The terminal equipment detects and controls it, and sends its status to the control equipment 1o with its own station address attached. Upon receiving this, the control device 1o displays on the monitor 2o to 23 the area corresponding to the transmitted own station address.

Through the series of operations described above, the load condition can be controlled and monitored as desired.

Problems to be Solved by the Invention However, in the above configuration, the partner station address setting means is set by a dip switch corresponding to each of the monitor display and the load control switch. Therefore, the number of switches becomes enormous, and it is not suitable in terms of cost and miniaturization. In addition, the inventors
We have already considered creating a highly reliable, compact, and inexpensive storage device by using IC memory, which is ICAROM (E2PROM) or RAM with backup, but the present invention further improves reliability and makes it semi-permanent. The present invention provides a nonvolatile storage device that can withstand use.

Means for Solving the Problems In order to achieve this object, the non-volatile storage device of the present invention uses a plurality of blocks for storing different contents in order to store data that needs to be retained even when the power is cut off. Each block has a storage means composed of a plurality of words for storing the same contents, a writing means for writing data and a one's complement of the data into the storage means in units of one word, and the storage means. a reading means for reading out the inside of the block word by word, and determining whether one word read from the reading means consists of data and a 1's complement of the data, thereby determining whether it is normal data or abnormal data. data determining means for determining whether the data read by the reading means is normal data and the same data as the data written in the storage means by the writing means; and the data referring means When it is determined that the data is not the same, the rewriting counting means counts the number of times rewriting is performed within one word, and the data determining means detects when words of normal data and words of abnormal data coexist in a block. When writing normal data into a word of abnormal data by the writing means and when writing new data into a block by the writing means, an instruction to write each word up to a predetermined number of times by the rewriting counting means. It consists of an arithmetic processing means that gives

Effect: With this configuration, when writing new data to the IC memory that should be stored even if the power is cut off (for example, the partner station address), each word is is performed by the writing means in the storage means so that the data and data become one's complement numbers. This is read word by word by the reading means, and the data determining means determines whether or not one word is the one's complement of the data and the data, and determines whether the data is normal or abnormal data. , the data reference means determines whether the written data and the read data are the same. Based on the above, when it is determined that the data is abnormal data or data that is not the same, the arithmetic processing means gives an instruction to write a predetermined number of times to the writing means using the rewriting counting means.

On the other hand, when reading data, the reading means reads out the block of the storage means in which the data of the desired location is stored word by word. Thereafter, the data determining means passes each block to the arithmetic processing means as to whether the data is normal or abnormal. The arithmetic processing means receives this and instructs the writing means to write normal data for each word in which abnormal data is detected only when normal data and abnormal data are mixed in the same block. According to the above, if there is even one piece of normal data, that data will be adopted.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
The figure is a block diagram of an embodiment of the present invention. Commercial 1
A device 27 and a control device 41 are connected to the 00V power line 24. Equipment 27 is 0N10F of load 26 and load
The AC 10 is combined with a terminal device 26 that performs F control and load status transmission, and is used as a transmission communication path.
Multiple units are connected to the 0V power line. Each terminal device 2
6 is the local address setting means 28 as explained in the conventional example.
have. On the other hand, the control equipment 41 includes a own address setting means 30 for setting the own address, and each terminal equipment 26.
A plurality of load control switches 32. and a monitor display means 33 corresponding thereto, and a device for storing addresses set to each of the load control switches.
Writing means 34. Reading means 36. Storage means 36. Data determining means 37. Data reference means 38. Rewriting counting means 391, normal/reading/writing mode changeover switch 40, arithmetic processing means 31 for controlling these means, and terminal equipment 2
6 and communication means 29 for communicating with each other. The storage means 36 has a plurality of blocks for storing data (in this embodiment, the partner station address) that needs to be retained even if the power is cut off, and one block has a plurality of blocks for storing the same content. It is made up of words. The writing means 34 writes one word of the partner station address and the one's complement of the partner station address into the storage means 36 as one unit. The reading means 36 reads data from the storage means 36 word by word. The data determining means 37
checks whether the one word obtained by the reading means 36 is data and the one's complement of the data, and determines whether it is normal data or abnormal data. The data reference means 3'8 determines whether the written data and the read data are the same. The rewrite counting means 39 counts the number of times rewriting has been performed in response to an instruction from the arithmetic processing means 31 when it is determined that the data written by the data reference means 38 and the data read are not the same. The normal/read/write mode changeover switch 40
This is a switch to select the mode to 6.

Note that the partner station address setting means 12 to 16, which are conventionally provided as many dip switches as there are terminal devices 26, are unnecessary because of the structure of this embodiment.

The normal operation in the embodiment of the present invention (when normal is selected with the normal/read/write mode changeover switch) is exactly the same as the conventional example, and therefore will not be described here.

Here, the control equipment 4 that became a means to solve the problem
Only the operation of storing the first partner station address and reading the stored data thereafter will be explained.

First, the writing procedure will be explained based on FIG. 2.

Select writing using the normal/read/write mode changeover switch 4o, set the own station address setting means 3o to the target station address to be set, and press the corresponding load control switch 32. As a result, the partner station address and the one's complement value of the partner station address are written in all words of the block corresponding to the load control switch 32 into the storage means 36 through the writing means 34. This is read out twice in succession for each word by the reading means 35 until the same data is obtained.
The data determining means 37 determines whether one word is a 1's complement of data and determines whether the data is normal data or abnormal data. Thereafter, when it is determined that the data is normal, the data reference means 38 determines whether the written data and the read data are the same. According to the above, when it is determined that the data is abnormal data or data that is not the same, the arithmetic processing means 31 gives an instruction to the writing means 34 to write a predetermined number of times (for example, 16 times) using the rewriting counting means 39.

Next, the reading procedure will be explained based on FIG. Control equipment 4
1 becomes unknown (for example, when the control device 41 is powered on) or when reading is selected with the normal/read/write mode selector switch 40 and the load control switch 32 is pressed, the load control switch All the words of the block corresponding to 32 are sequentially read out from the storage means 36 through the reading means 36. Then, it is determined whether the data of each word at this time is the one's complement of the partner station address and the partner station address, and the data determining means 37 determines whether the data is normal data or abnormal data, and the arithmetic processing means 3
1 is passed for each block.The arithmetic processing means 31 receives this, and the writing means 34 writes normal data for each word in which abnormal data is detected only when normal data and abnormal data are mixed in the same block. give. At this time, the writing process is performed by the reading means 35, the data determining means 37, the data referencing means 38, and the rewriting counting means 39, in the same way as described in the above writing procedure. As described above, if there is even one piece of normal data, that data will be adopted, and if all the pieces of data are abnormal, the data will not be adopted.

Although it has been explained here that the address of the other party is stored, this may be any data that needs to be stored even if the power is cut off, such as timer time, telephone number, etc.

In addition, the number of terminal devices (:n) and the number of identical data storage (:m
≧2. ) may be any number, and the own address setting means 30 may be included in the storage means 36.

In addition, the storage means 36 specifically refers to EARO
M (=E PROM) or R with backup
It means IC memory such as AM.

Effects of the Invention As described above, the present invention provides a writing means, a reading means, a storage means, a data determination means, and a data reference means.

By having rewriting counting means and arithmetic processing means,
Conventional dip switches are cheaper and more compact, and by storing multiple pieces of the same data in IC memory and reading and writing it multiple times, it is highly reliable and can retain data semi-permanently. It is a countermeasure against noise, noise, etc., and its practical effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing a writing procedure, FIG. 3 is a flowchart showing a reading procedure, and FIG. 4 is a configuration diagram showing a conventional example. 31...Arithmetic processing means, 34...Writing means, 36...Reading means, 36...
・Storage means, 37... Data determination means, 38...
. . . Data reference means, 39 . . . Rewrite counting means. Name of agent: Patent attorney Shigetaka Awano (1 person) r area god

Claims (1)

[Claims] In order to store data that needs to be retained even when the power is cut off, a storage means having a plurality of blocks for storing different contents, each block consisting of a plurality of words for storing the same contents; a writing means for writing one word of data and a one's complement of the data into the means; a reading means for reading out the inside of the block of the storage means word by word; and a reading means for reading data from the reading means. , data determining means for determining whether a word is normal data or abnormal data by determining whether or not a word consists of data and a one's complement of the data; and the data read by the reading means is normal data, and , a data reference means for referring to whether or not the data is the same as the data written in the storage means by the writing means; and a count of the number of times the data is rewritten within one word if the data reference means determines that the data is not the same. and a rewriting counting means for writing normal data into a word of abnormal data by the writing means only when words of normal data and words of abnormal data coexist in one block according to the data determining means, and one block. and arithmetic processing means for giving an instruction to write each word up to a predetermined number of times by the rewrite counting means when new data is written by the writing means.