JPH01321513A - Controller with external memory device - Google Patents

Abstract

PURPOSE:To decrease the reading defects caused by the temperature characteristics of a memory medium by using a temperature setting circuit and a temperature detection control circuit by setting a range of temperatures when a writing action is applied to a memory medium of an external memory device. CONSTITUTION:A temperature measuring circuit 6 which measures the ambient temperatures of an FDD 5 transmits the voltage proportional to a relevant temperature as a temperature signal. A temperature detection control circuit 7 decides the output signal received from the circuit 6 and transmits a write inhibiting signal to a central processing part 3 outside a set range of temperatures. When a data writing instruction is inputted to the FDD 5 from a keyboard 2, the part 3 decides whether the write inhibiting signal outside the set temperature range is transmitted from the circuit 7 or not. If so, the part 3 gives no writing instruction to an FDC 4. Thus the reading defects can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device equipped with an external storage device that writes data from a central processing unit to a storage medium, and particularly to temperature control during data writing.

(Prior art) Figure 3 shows a control device equipped with a conventional external storage device.
For example, it is a block diagram showing the configuration of a numerical control device, in which (1) is a CRT display, (2) is a keyboard, and (11) is a central processing unit. (12) is an external storage device control circuit that controls an external storage device, such as a floppy disk controller (hereinafter referred to as rFDCJ).

(13) is an external storage device, such as a floppy disk drive (hereinafter referred to as "FDD"), which is connected to the FDC and reads and writes data on a storage medium (for example, a floppy disk).

A conventional numerical control device equipped with an external storage device is configured as described above, and for example, the FDD (13
), the CRT display (1) displays a message indicating the start of the write process, and the central processing unit (1) issues a write operation command to the FDC (12). This operation command causes data to be written to a specified location on the floppy disk of the FDD (13).

Data is written to the floppy disk of the FDD (13) through the series of operations described above. When the writing is completed, a message indicating the completion of processing appears on the CRT display (1).

(Problem 8 to be Solved by the Invention) In the conventional numerical control device equipped with an external storage device as described above, data is written to a floppy disk regardless of the ambient temperature of the external storage device. Therefore, if the temperature at the time of writing and the temperature at the time of reading differ greatly, the position specified on the floppy disk at the time of writing may shift during reading due to distortion due to temperature changes, which may result in read I2 failure. There was a problem.

This invention was made to solve this problem, and is a control system equipped with an external storage device that eliminates the occurrence of reading failures by setting the temperature range when writing to the storage medium of the external storage device. The purpose is to obtain equipment.

(Means for Solving the Problems) A control device equipped with an external storage device according to the present invention includes a temperature measurement circuit that measures the ambient temperature of the external storage device, and a signal measured by the temperature measurement circuit. This device is equipped with a temperature detection control circuit that outputs a write inhibit signal to the central processing unit or external storage device control circuit when the input signal falls outside a preset temperature range.

(Operation) In the present invention, the ambient temperature at the time of writing data is measured, and when the temperature falls outside a preset temperature range, writing to the storage medium is prohibited.

(Embodiment) FIG. 1 is a block diagram showing the configuration of a numerical control device showing an embodiment of the present invention, and (1) and (2) are completely the same as the conventional device described above. (3) is the central processing unit, (4
) is an external storage device control circuit that controls external storage devices, such as a floppy disk controller (rFDC).
It's called l. ), (5) is connected to the FDC and the storage medium (
For example, a floppy disk drive (hereinafter referred to as "FDDJ") is an external storage device that writes/reads data to/from a floppy disk.
A temperature measurement circuit that measures the ambient temperature of the DD (5) sends out a voltage proportional to the temperature as a temperature signal.

(7) judges the output signal from the temperature 7IllJ constant circuit (6), and if it is outside the set temperature range, the central processing unit (3)
This is a temperature detection control circuit that sends a write inhibit signal to the

In a numerical control device equipped with an external storage device configured as described above, when a command to write data to the FDD (5) is input from the keyboard (2), the central processing unit (3
) determines whether a write prohibition signal is output from the temperature detection control circuit (7) when the temperature is outside the set temperature range, and
If the write inhibit signal is not output, the CRT
The display (1) displays a message indicating the start of the write process, and furthermore, a write operation command is issued to the FDC (4). Data from this central processing unit (3) is sent to FDC (4) and FDD.
Data is written to the floppy disk via (5).

In this way, the FDC (4) executes the write command according to the central processing unit (3), but here again, the write prohibition signal outside the temperature range set from the temperature detection control circuit (7) is output. Alternatively, it may be determined whether or not there is one.

On the other hand, if the temperature detection control circuit (7) sends a write prohibition signal to the central processing unit (3) when the temperature is outside the set temperature range, the central processing unit (3) writes to the FDC (4). Write operation command information is not executed.

Next, FIG. 2 is a flowchart showing the operation of the temperature detection control circuit (7), and the operation will be explained.

First, the temperature detection control circuit (7) determines whether a write operation command is being executed based on a signal from the central processing unit (3). When a write operation command is being executed, even if the signal from the temperature measurement circuit (6) is outside the set temperature range,
The temperature detection control circuit (7) does not output a write inhibit signal to the central processing unit (3) until execution of the write operation command is completed (Sl). Then, when the above execution is completed or when the write operation command is not being executed, the process proceeds to the next step and the signal from the temperature measurement circuit (6), that is, the ambient temperature of the FDD (5) is set. Whether the temperature is above the upper limit (S2) and below the lower limit (S2)
3) respectively. If either one of them is out of range and the temperature is out of range, a write prohibition signal is output to the central processing unit (3) (94). After that, the operation returns to steps (S2) and (S3) and repeats the above determination.

Furthermore, if the ambient temperature is within the set temperature range, the write inhibit signal is reset (S5), the process returns to step (SL) again, and it is determined whether the write operation command is being executed or not. At this time, the data write operation command can be executed.

In addition, although the numerical control apparatus was illustrated in the said Example, it may be used for the control apparatus equipped with other external storage devices.

In addition, although the temperature detection control circuit (7) and the central processing unit (3) have been exemplified for operation by temperature control during data writing, the external storage device control circuit (4) is used instead of the central processing unit (3). ), a write inhibit signal may be sent to the external storage device control circuit (4) by sending and receiving similar signals (the broken line portion in FIG. 1).

Further, although an FDD is illustrated as the external storage device (5), the present invention is not limited thereto, and other devices having similar functions such as a hard disk drive, a cassette tape recorder, etc. may also be used.

Further, although one external storage device (5) is used, a plurality of external storage devices (5) may be used.

Furthermore, the same effects as the present invention can be obtained even when the external storage device (5), the temperature Δp1 constant circuit (6), and the temperature detection control circuit (7) are used as one unit.

(Effects of the Invention) As described above, according to the present invention, by setting the temperature range when writing to a storage medium of an external storage device, the temperature during writing is limited and read failures due to temperature characteristics of the storage medium are prevented. This has the effect of reducing the damage and preventing destruction of written data and the like during writing.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a numerical control device according to an embodiment of the present invention, Fig. 2 is a flowchart showing the operation of a temperature detection control circuit, and Fig. 3 is a conventional numerical control device equipped with an external storage device. FIG. 2 is a block diagram showing the configuration of FIG. In the figure, (1) is a CRT display, (2) is a keyboard, (3) is a central processing unit, (4) is an external storage device control circuit, (5) is an external storage device, (6) is a temperature measurement circuit, (7) is a temperature detection control circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] A central processing unit, an external storage device that writes data from the central processing unit to a storage medium, and an external storage device that sends data from the central processing unit to the external storage device and controls the external storage device. In a control device equipped with a control circuit, a temperature measurement circuit that measures the ambient temperature of an external storage device and a signal measured by the temperature measurement circuit are input, and the input signal falls outside the preset temperature range. 1. A control device equipped with an external storage device, comprising: a central processing unit; or a temperature detection control circuit that outputs a write inhibit signal to an external storage device control circuit.