JPH03292510A - Monitor device for controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a monitoring device for a control device installed in equipment such as a copying machine and a printer, and particularly to a control device for monitoring the contents of a random access memory for the purpose of depacking. The present invention relates to a device monitoring device.

do.

[Conventional technology]

Conventionally, in equipment such as copying machines, it has been common practice to monitor the contents of random access memory (hereinafter referred to as RAM) to check control operations by a microcomputer for purposes such as program debugging. ing.

Taking the case of a copying machine as an example, by turning on a special switch provided for the monitor or by operating the keys on the operation panel in a special order, the mode is set to monitor, and in that state, using the numeric keypad etc. RA you want to monitor
Specify the address of M. As a result, the contents of the address specified in the RAM are digitally displayed on the display section on the operation section, and the control operation is confirmed based on the display data.

Incidentally, a separate monitoring unit equipped with means for specifying a RAM address and means for displaying data is prepared, and the monitoring unit is attached to a control board of a copier or the like only at the time of monitoring.

FIG. 5 shows an example of a conventional monitor device for a control device such as a copying machine.

The microcomputer 500 is connected to rotary switches 503 and 504 for RAM addressing via an expander 502, and a 7-segment digital display 5 via an expander 505.
06 is connected.

Further, the microcomputer 500 has a built-in RAM 501 that stores various control data shown in FIG.

To explain the monitor operation using FIG. 6, first, the RAM 501 is
When the lower two digits of the address are specified, the data stored in the RAM 501 at the corresponding address is digitally displayed on the digital display section 506 as shown.

The control operation is confirmed by visually checking this digital display data.

Note that a method of connecting a printer in place of the digital display section 506 and displaying data has also been adopted.

Further, the monitoring operation is performed by a monitoring program stored together with the control program.

[Problem to be solved by the invention]

However, since the conventional monitor device for the control device described above is configured to digitally display the contents of the RAM, the data to be monitored has little variation in value, or
If the data does not require fluctuating values, there is no problem with digital display, but if the data is, for example, the temperature of the fusing unit or the control voltage of the exposure lamp, it is difficult to confirm accurate control operations with digital display. There was a problem that I couldn't do it.

The present invention has been made in view of the above, and it is an object of the present invention to enable accurate confirmation of control operations even in the case of data that is difficult to grasp using digital values.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a monitoring device for a control device having a random access memory, which includes an addressing means for specifying an arbitrary address of the random access memory, and a D/A converter for converting digital data into analog data. the digital data stored at the address specified by the address specifying means on the random access memory, and
The present invention provides a monitor device for a control device that inputs data to an A converter, converts it into analog data, and outputs it.

[Effect]

A monitor device for a control device according to the present invention reads an address specified by an address specifying means, reads digital data stored in a RAM based on the address, and inputs the read digital data to a D/A converter. , convert it to analog data, and output it to a monitoring device.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a monitor device for a control device according to the present invention will be explained in detail based on the drawings.

FIG. 1 is a block diagram showing the configuration of a monitor device of a control device according to an embodiment of the present invention.

Microcomputer 10 installed in equipment such as a copying machine
0 has a built-in RAM l0I that stores data for various controls.

The monitor device of this embodiment is the microcomputer 1 mentioned above.
00, ■ Two rotary switches 103 and 104 that specify the address of RAMl0I connected via the 0 expander 102, and a D/A that converts digital data into analog data that is also connected to the microcomputer 100. It is composed of a converter 105.

Note that in actual copying machines and the like, various equipment control elements are connected to the microcomputer 100.
In FIG. 1, only elements related to the present invention are shown to make the explanation easier to understand.

As the microcomputer 100, for example, NE
A 1-chip microcomputer μPD7811 made by C was used.

RAM10I built into the microcomputer 100
has a storage capacity of 256×1 bytes as shown in FIG. 2, and addresses FF0OH-FFFFH are given in hexadecimal notation as its memory addresses. One byte of data is stored for each address.

The microcomputer 100 controls the equipment by using the data stored in the RAM 101. Furthermore, by monitoring the contents of RAMl0I, it is possible to check the control operation.

The rotary switches 103 and 104 each have RAM10
Specify the lower two digits of the address attached to I. That is,
The rotary switch 103 specifies the second digit from the least significant, and the rotary switch 104 specifies the least significant digit. The upper two digits do not need to be specified since they are always FF.

FIG. 2 shows how data in RAM 10I, addressed by rotary switches 103 and 104, is output from D/A converter 105.

In the figure, rotary switches 103 and 104 are 7 and A, respectively.
Therefore, address FF7A is specified, and address FF7 of the data in RAM10I is specified.
The data (1 byte of digital data) corresponding to A is R
The signal is read from AMl0I and input to the D/A converter 105.

This input digital data is converted to analog data and output from the output terminal 106 of the D/A converter 105.

For example, an oscilloscope or a voltmeter is connected to the output terminal 106 of the D/A converter 105 as a monitoring device, and in the case of a copying machine, the temperature of the fixing unit, the control voltage of the exposure lamp, etc. are monitored. Ru.

On the other hand, the monitoring process by the monitor device configured as described above includes initialization process (step Sl), device process (step S2), monitor process (step S3), and device process, as shown in the flowchart of FIG. The process (step S4) is executed by a monitor program incorporated into the microcomputer 100(7) control program that is repeatedly processed.

The monitoring process will be explained below based on the flowchart shown in FIG.

First, it is determined whether or not a monitoring device is connected (step Sl). Here, if it is determined that there is no connection, the series of processing ends. This process is necessary in a system in which a monitoring device is not normally connected, but is connected only when monitoring is necessary.

On the other hand, if it is determined in step S1 that the monitoring device is connected, then it is determined whether there is a monitor output request (step 32), and if it is determined that there is no output request, a series of steps are performed. Finish the process. This process is
This is necessary if the monitor process is executed only when necessary and not when it is not necessary. For example, D
This is necessary in a system in which the /A converter 105 is used for both monitoring and device control.

When a monitor device is connected and it is determined that there is a monitor output request, the rotary switches 103 and 1
Read the address specified in 04 (step S3)
, and further reads the data in RAMl0I corresponding to the specified address (step S4).

Finally, the read digital data of RAMl0I is
/A converter 105 (step S5), and the series of processing ends.

After the sonar, the analog data output from the D/A converter 105 is monitored by a connected monitoring device, and the control operation is verified.

Incidentally, in the above embodiment, rotary switches 103 and 104 were used as the addressing means for RAMl0I, but
It is also possible to use other elements. Also, RAM10
Although the case where I is built in the microcomputer 100 is shown, it is also applicable to the case where the RAM is provided separately from the microcomputer.

Furthermore, if a digital display unit as shown in FIG. 5 is provided together with the D/A converter 105, and the data read from the RAM 101 is inputted to the D/A converter 105 or the digital display unit by switching, the type of data to be monitored can be changed. Realizes a monitor that suits your needs.

〔Effect of the invention〕

As explained above, according to the monitoring device for a control device according to the present invention, the monitoring device for a control device having a random access memory includes an address specifying means for specifying an arbitrary address of the random access memory, and a method for converting digital data into analog data. and a D/A converter for converting into analog data, the digital data stored at the address specified by the address specifying means on the random access memory is input to the D/A converter, and the digital data is converted into analog data. In order to convert and output, the RAM of the control device
The contents are output as analog values, and even if the data is difficult to understand with digital values, control operations can be accurately confirmed by monitoring with an oscilloscope, voltage needle, etc.

In particular, in the case of a copying machine controlled by a microcomputer, the present invention is effective for monitoring voltage values in exposure lamp voltage control, temperature in fixing temperature control, speed in scanner speed control, and the like.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a monitor device of a control device according to an embodiment of the present invention, and FIG. 2 is an explanation showing how data in the RAM specified by the address of the monitor device shown in FIG. 1 is output from a D/A converter. 3 is a flowchart showing processing by a microcomputer control program,
FIG. 4 is a flowchart showing the monitor processing according to this embodiment, FIG. 5 is a block diagram showing an example of a conventional monitor device, and FIG. FIG. 2 is an explanatory diagram showing a ladder displayed on the screen. Explanation of symbols O-・-Microcomputer・RAM 2・-IO exchange 3,104-Rotary switch 5-・-D/A converter 00 Fig. 1

Claims (1)

[Claims] A monitoring device for a control device having a random access memory, comprising: addressing means for specifying an arbitrary address in the random access memory; and a D/A converter for converting digital data into analog data. , A control device characterized in that digital data stored at an address on the random access memory designated by the address designation means is input to the D/A converter, converted to analog data, and outputted. Monitor device.