JPH0831009B2 - Program input device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program input device for inputting a sequence program for a programmable controller, and more specifically, a program capable of switching a built-in display and an externally connected display. Regarding the input device.

[Conventional technology]

Conventionally, a program input device for inputting a sequence program executed by a programmable controller is generally called a loader, and the input sequence program is displayed on a built-in display in the form of a circuit diagram.

The circuit configuration of a conventional program input device of this type
Shown in the figure.

In FIG. 5, central processing unit (CPU) 1, read only memory (ROM) 2, user random access memory (RAM) 7, system RAM 8, external display interface 4, built-in display 5, input / output interface 6 and the keyboard 12 are connected to the address bus 11 and the data bus.

The sequence program input from the keyboard 12 is
The data is stored in the user RAM 7 by the CPU 1 and displayed on either the external display (not shown) or the built-in display 5.

When the external display is selected by the changeover switch 3, an ON signal is generated from the changeover switch 3. Then CPU1
In response to the address designation of the display unit (common to the external display unit and the built-in display unit), the decoder 9 outputs an on-chip select signal to the external display unit interface 4, and the external display unit interface 4 becomes operable. The input information (sequence program) stored in the user RAM 7 is transferred to the external display by the CPU 1. In addition, the above input information stored in the user RAM7
It is output to the programmable controller main body via the input / output interface 6 based on the operation control of the CPU 1. The system program for the operation control by the CPU 1 is stored in the read-only memory (ROM) 2 in advance, and various calculation data used in executing the system program is stored in the system RAM 8. In the conventional program input device of this type, the external display device and the built-in display device 5 are selected by a dedicated selector switch 3, and a display label indicating the selected display device is attached in the switching direction of the selector switch 3. The operator is guided in the operating direction of the changeover switch.

[Problems to be Solved by the Invention]

However, in the conventional program input device of this type, the changeover switch 3, the connection signal line, and the display label are required for switching the display unit, so that the number of parts constituting the device is increased and the device is downsized. It was a big obstacle for cost reduction. In addition, there is a high probability that the changeover switch will be erroneously operated, and if the display label comes off,
There was also a problem that the display unit could not be selected.

Therefore, an object of the present invention is to eliminate such a problem, to issue a switching instruction between a built-in display and an externally connected display using a keyboard for program input without a dedicated changeover switch, and to display the changed display. It is to provide a program input device capable of outputting display information to a container.

[Means for Solving the Problem] In order to achieve such an object, a first embodiment of the present invention is directed to an interface for transporting display information to an external display and a built-in device installed in a program input device. A keyboard for sequence program input that can specify the display unit to be displayed by inputting one of the identification codes assigned to the display unit, the external display unit and the built-in display unit, and the identification input from the keyboard The memory for storing the code and the type of the identification code stored in the memory when the display information is output are identified, and when the identification code is identified as the code assigned to the external display, the display information is output to the interface. When the identification code is identified as the code assigned to the built-in display, the display information is output to the built-in display. And a central processing unit.

According to the second aspect of the present invention, prior to input of the identification code,
It is characterized in that guide information for selecting and designating the display is displayed on the built-in display.

[Action]

The present invention focuses on the fact that a keyboard for inputting a sequence program can input numbers and characters, and by inputting an identification code for selecting a display from this keyboard, a dedicated changeover switch is not required. Since the identification code input from the keyboard is stored in the memory, the central processing unit can select the display device to be output by referring to the stored content of the memory when outputting the display information. . Further, since the guide information for selecting the display device is displayed on the built-in display device, it is not necessary to provide a display label which has been conventionally required.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a circuit configuration of an embodiment of the present invention. Incidentally, the same parts as those of the conventional example shown in FIG.
Detailed description is omitted.

In FIG. 1, addresses are individually assigned to the external display interface 4 and the built-in display 5. Decoder 21 responds to each address
Generates C / S signal. The gate circuit 22 inputs the C / S signal to the external display interface 4, and causes the display information on the data bus 10 to be input to the external display interface 4 when the C / S signal is on.

The gate circuit 23 inputs the C / S signal to the built-in display 5, and causes the display information on the data bus 10 to be input to the built-in display 5 when the C / S signal is on.

An area for storing flag information indicating the selected display device is provided in the system RAM 8, and the CPU 1 refers to this flag information when displaying various information and determines the display device to be output. . The keyboard 12 has a character key and a numeric key. By pressing these keys, the display switching mode is instructed and the display is selected. Next, the circuit operation of the embodiment of the present invention will be described with reference to the flowcharts of FIGS.

FIG. 2 shows the control procedure of the CPU 1 for selecting the display device, and FIG. 4 shows the control procedure of the CPU 1 for outputting the display information to the selected display device.

When the switching mode of the display is designated by the rise of the power source or the command input from the keyboard 12, the CPU 1 sequentially reads the control procedure of FIG. 2 from the ROM 2 and executes it. That is, a guidance message for selecting a display as shown in FIG. 3 is displayed on the built-in display 5 (step S in FIG. 2).
1).

Based on this guidance message, when the operator inputs the numerical value "2" from the keyboard 12 in order to select the external display (step S2 in FIG. 2), the CPU 1 discriminates the input numerical value information (second In step S3 in the figure, the indicator flag is set to the numerical value "2" and the value of the flag is stored in the system RAM 8 (step S4 in FIG. 3). Operator has built-in display 5
When is selected, the indicator flag is set to the numerical value "1". In this example, since the guide message for selection is displayed when selecting the display device, even an operator who is unfamiliar with the operation of the device can surely input and select the display device. Further, since the guide message is displayed on the built-in display 5, a display label for the changeover switch is not required as in the conventional case.

Next, the sequence command input from the keyboard 12,
When displaying operation instructions for the programmable controller or output information from the programmable controller,
The CPU1 reads the control procedure shown in FIG. 4 from the ROM2 and executes it. That is, the value (“2”) of the indicator flag stored in the system RAM 8 is read (step S10 in FIG. 4),
After setting the address of the display unit corresponding to this value (5th
In step S11 in the figure, the information to be displayed is output from the CPU 1 (step S12 in FIG. 5).

Returning to FIG. 1, the decoder 21 uses the C / S of the external display interface 4 according to the address set by the CPU 1.
Set the signal on. As a result, the gate circuit 22 is opened. The display information that is continuously output from the CPU1 is the data bus 10 → gate circuit 22 → external display interface 4
→ Transferred in the order of the external display unit, and the display information is displayed on the external display unit. At this time, since the C / S signal of the built-in display 5 is off, the built-in display 5 does not operate and the gate circuit 23 is also closed, so the display information is erroneously sent to the built-in display 5. It will not be transferred.

As described above, in the present embodiment, the keyboard 12 is used to instruct the changeover of the display unit, so that it is not necessary to provide a dedicated changeover switch as in the conventional case.

 The following can be considered as an application example of this embodiment.

(1) In this embodiment, the display unit is selected when the power is turned on.
The display indicator flag may be set to "1" to automatically select the built-in display 5.

(2) In the present embodiment, the guidance message displayed on the built-in display 5 is only displayed as the number input for selecting the display, but at this time, the display corresponding to the value of the display display flag is displayed. The name of the device may be displayed on the display screen to inform the operator of the currently selected display device.

(3) In this embodiment, one of the external display and the internal display is selectively switched, but the display information can be output to both the external display and the internal display. In this case, set the address for both display output,
With this address setting, two C / S signals for the external display interface and the built-in display 5 are decoded by the decoder 2
Turn on with 1.

〔The invention's effect〕

As described above, according to the present invention, focusing on the fact that the keyboard for sequence program input is capable of inputting numbers and characters, and by inputting the identification code for selecting the display unit from this keyboard, a dedicated code can be input. The changeover switch is no longer necessary. In addition, since the identification information input from the keyboard is stored in the memory, when the display information is output,
The central processing unit can select the display device to be output by referring to the stored contents of the memory. Further, since the guide information for selecting the display device is displayed on the built-in display device, it is not necessary to provide a display label which has been conventionally required.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the present invention, FIGS. 2 and 4 are flow charts showing a control procedure executed by a CPU 1 of the embodiment of the present invention, and FIG. 3 is a display example of the embodiment of the present invention. FIG. 5 is a block diagram showing a circuit configuration of a conventional example. 1 ... CPU, 2 ... ROM, 4 ... External display interface,
5 ... Built-in display, 9, 21 ... Decoder, 4-1, 5-1
22, 23 ... Gate circuit.

Claims (2)

[Claims] 1. An interface for transferring display information to an external display, a built-in display installed in a program input device, and an identification code pre-assigned to the external display and the built-in display. A keyboard for inputting a sequence program capable of designating a display device to be displayed by inputting, a memory for storing the identification code input from the keyboard, and a memory for storing the display information when the display information is output. When the identification code is identified as the code assigned to the external display, the display information is output to the interface, and the identification code is assigned to the built-in display. And a central processing unit that outputs display information to the built-in display when it is identified as Program input device according to claim. 2. The program input device according to claim 1, wherein guide information for selecting and designating a display is displayed on the built-in display prior to the input of the identification code.