JPS6148009A - Programmable controller - Google Patents

Abstract

PURPOSE:To speed up the monitor processing by reading the I/O information required for the picture plane designated by a registration request command from an I/O buffer memory to edit and regist and by monitoring solely the delivery of picture plane table number from the external CRT monitor device side. CONSTITUTION:After the initial processing during the serial interface service, YES or NO is decided for the input of any command from external CRT monitor device 1. When the command is put in, the contents thereof are analyzed and when the command requires the registering of monitor information, the I/O information required for the picture plane designated by the command is read from an I/O buffer memory 23 to edit into the monitor information and to register the information on the corresponding picture plane table. When the command requires additionally the registering of monitor information, the monitor information of the table corresponding to the picture plane designated by the commant is read out to send it to the external CRT device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a programmable controller to which an external CRT monitor device can be connected.

(Prior art and its problems) Conventionally, in a programmable controller that can connect an external CRT monitor device (such as a personal computer) via a transmission line, the information necessary for the monitor (for example, I10 address, Iil collection determination method) is created from the screen information and sent to the programmable controller main unit in the form of a request command via serial transmission, and on the other hand, the programmable controller main unit analyzes this request command. After that, necessary input/output information is read from the input/output buffer 1 memory, and this is edited into monitor information and sent back to the external CRT monitor device.

However, with this type of system, every time a request command is received on the programmable controller side, complex operations such as command node analysis9 data import and editing into monitor information are required. Therefore, monitoring processing takes time, which has an adverse effect, such as restricting the original instruction execution speed of the programmable controller.

(Object of the Invention) The object of the present invention is to provide a programmable controller to which this type of external CRT monitor device can be connected.
The objective is to achieve faster monitoring processing.

(Structure and Effects of the Invention) In order to achieve the above object, the present invention responds to a registration request command given from an external CRT monitor device.
Reads the input/output information necessary for the screen specified by the command from the input/output buffer memory and uses it as monitor information.
A registration control means that collects all the information and registers it in the corresponding screen table; and in response to a monitor request command given from the external CRT monitor device, monitor information of the table corresponding to the screen specified by the command is sent to the external CRT monitor device. The apparatus is characterized by comprising a monitor information transmitting means for transmitting monitor information to.

According to such a configuration, even when monitoring, the external CR
On the T monitor '4A side, it is only necessary to send the screen table number, and on the other hand, on the programmable controller main body side, the information can also be analyzed.

No conversion or processing is required.

Therefore, the processing time and transmission loss between the external CRT monitor device and the programmable controller main body are reduced, and the speed of monitoring processing can be increased.

(Description of Embodiments) FIG. 1 is a block diagram conceptually explaining the present invention. In the figure, an external CRT monitor device 1 is composed of a data processing device such as a personal computer and a CRT.
This external CRT monitor device 1 is connected to a programmable controller main body device 2 via a serial transmission line.

On the programmable controller main unit 2 side, in response to the registration request command given from the external CRT monitor device 1, input/output information necessary for the screen specified by the command is successively outputted from the input/output cover sofa memory and monitored. Edit the information and register it in the corresponding screen table.

Further, in response to a monitor request command given from the external CRT monitor device 1, the monitor information of the table corresponding to the screen specified by the command is sent back to the external CRT monitor device 1.

Next, the present invention will be explained more specifically. FIG. 2 is a block diagram showing the hardware configuration of the programmable controller main unit 2. As shown in FIG.

This programmable controller main unit has a CPU
20. System program memory 21. Working memory 229 people output buffer 1 memory 23° user program memory 24. Serial transmission interface 25 and input/output 4! The serial transmission interface 25 is connected to the external CRT monitor device 1 via a serial transmission line.

The CPU 20 centrally controls the entire main unit, and the system program memory 21 stores a system control task as shown in FIG. 3 and a serial interface task as shown in FIG. 4.

The working memory 22 is used as a working area during arithmetic processing, and is also provided with a monitor information registration table according to the present invention.

Here, a plurality of monitor information registration tables are provided corresponding to the device name screen of the external CRT monitor device.

The human output buffer 1 memory 23 is provided with a storage capacity corresponding to the input/output capacity of the input/output device 26, and is updated J5 of the input data from the input/output device 26 and input/output device by the input/output update process described later. The output data is updated to 26.

The user program memory 24 sequentially stores instructions tB corresponding to the ladder diagram appropriately set by the user.

Next, the operation of this programmable controller device will be explained with reference to FIGS. 3 and 4.

First, when the program starts by turning on the power, etc.,
After initial processing is executed (step 100), programming console processing (step 101), serial interface service (step 102), J5 and output clear processing (step 104) is repeatedly executed.

The programming console process (step 101) is to execute various processes according to input data in response to manual key operations 451'j on the programming console.

Serial interface service processing (step 10)
2) has been newly established in connection with the present invention, and its details will be described later with reference to FIG.

In the output reset process (step 104), all external output latches of the input/output device 26 are reset to 1NOR.

After repeating the above operations, the instruction execution mode is set on the programming console (step 103), the program counter PC is initialized (step 105), and the user instruction execution process is started. Begins.

That is, step 106) reads the instruction words one by one from the user program memory, steps 108) executes the instructions, then updates the program counter PC and repeats the same operation step 109), during which the END instruction is executed. is read out (step 107
(Yes), execute input/output update processing (step 110)
.

Then, if the input/output update processing is completed, G? (Step 110), programming console processing (Step 101), serial interface service (Step 102), a series of instruction execution processing II (Steps 105 to 109), and input/output update processing (Step 11).
0) will be executed repeatedly.

Next, details of the serial interface service will be explained with reference to FIG. In this process, after initial processing (step 1020), it is determined whether any f'X command has arrived from the external CRT monitor device 1 (step 1021), and if a command has arrived, its contents are analyzed. .

Here, if the command is a monitor information registration request command (step 1022), input/output information necessary for the screen specified by this command is stored in the crowd cover far memory 2.
3, edit this into monitor information, and register it in the corresponding screen table (step 1023>a. Also, if the incoming command is a monitor information request command (step 1024 affirmative), the screen specified by this command The monitor information in the table corresponding to the table is read out (step 1025), and the information is sent to the external CRT monitor device (step 1026).

If it is another command, the corresponding command processing is performed (step 1027), and the processing after the command input (step 1021) is repeated.

Therefore, according to this programmable controller, as long as the necessary monitor information corresponding to each screen is given in advance from the external CRT monitor device 1 to the programmable controller main body in the form of a registration command, it is possible to respond to this. On the main unit 2 side, the input/output information necessary for the screen specified by this command is read from the input/output buffer 7 memory 23, edited as monitor information, and registered in the corresponding screen table. monitor'
By simply sending a monitor information request command together with the screen table number from the 3A unit 1 side, monitor information corresponding to the required screen is immediately sent to the external CRT monitor device 1 side.

Here, since the monitor request command only takes a few bytes and there is no need to analyze the command information, the data can be taken in immediately during the next serial interface service, which also improves the response speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram conceptually explaining the present invention, FIG. 2 is a block diagram showing the hardware configuration of the programmable controller device, FIG. 3 is a flowchart showing the overall system program configuration, and FIG. 4 is a flowchart without showing details of the serial interface task. 1... External CRT monitor device 2... Programmable controller main unit 20.
... CPU 21 ... System program memory 22 ... Working memory 23 ... Attendance buffer 1 memory 24 ... User program memory 25 ... Serial transmission interface 26 ... Input/output device

Claims (1)

[Claims] (1) In response to a registration request command given from an external CRT monitor device, input/output information necessary for the screen specified by the command is read from the input/output buffer memory, edited into monitor information, and displayed on the corresponding screen. Registration control means for registering in a table; in response to a monitor request command given from an external CRT monitor device, monitor information in the table corresponding to the screen specified by the command is registered in the external CRT monitor;
A programmable controller comprising monitor information sending means for sending out to a monitor device.