JPS5860352A - Display output system - Google Patents

Abstract

PURPOSE:To reduce the load of a master electronic computer by outputting a prearranged address from a display output side to a display information storage part in a master memory and reading out display data in accordance with a direct memory access system. CONSTITUTION:When a data address in a master memory 13 is inputted together with a ready signal to an I/O part 15 in a master electronic computer 1A, one set of data in the main memory 13 which are specified by said data address through a direct memory access controller 14 and the I/O part 15 are outputted to the I/O part 15. Since necessary display data on the memory 13 are inputted to a display output device 2A by a controller 22A, addresses in which data are stored are successively outputted from an output device 24 together with ready signals. Consequently the device 2A can input necessary data successively from an input device 21A at the timing generated from itself without processing by a CPU 12. The input data are displayed on display units 31-3n in a supervisory board 3 through display unit driving output devices (23-1)-(23-n).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display output method for outputting and displaying display information from a main computer, and more particularly to a display output method designed to reduce the load on the main computer.

In the system, all processing related to the man-machine interface device is also performed by the central electronic computer. Conventionally, display output to a monitoring panel or the like, which is one of the man-machine interface devices, is performed from a digital output device 1 operated by program processing of the main computer 1 via a process input/output path PB, as shown in FIG. outputs the display information to the display output device 2 and outputs the display information to the display output device 2 and displays the indicators (indicator lights, etc.) 31 to 3n on the monitoring panel 3.
drive. In this method, the central processing unit (hereinafter referred to as CPUJ) 12 of the main computer 1 selects display information from among the many data in the main memory 13 and performs the necessary output processing. Output from digital output device 1.1. Therefore, CPU 1
2 is occupied for a predetermined time for this display output processing, and cannot perform any other processing during this time. Therefore, programs are usually created to process such simple processing tasks at a lower priority than other processing tasks. When the CPU 12 is in a busy state due to such a low priority order, display data may not be processed easily, and even if the data changes, display output may be delayed. Note that DB is main memory 1
Direct memory access to 3 (hereinafter referred to as [DMAJ
(abbreviated as ) path, and CPU J 2 also uses this QMA path.
They are connected via a path DB. Further, 21 is a digital input device that receives the output from the digital output device 11 of the main computer 1, and a display output device that controls the display output based on the display information received by the 2zh digital input device 21. The controllers 23-1 to 23-n are display output digital output devices that drive the displays 31 to 3n of the monitoring panel 3.

In this way, in the conventional method, display output processing is the main electronic calculation! If the load on the main computer 1 is reduced as much as possible, and the impact on other processes is reduced, the display state change will be significantly delayed, which has become a problem. .

The present invention has been made to solve these problems, and it does not interfere with other processing in the main computer, and the output of state changes is also delayed. The features of the invention are as follows: 1. In a display output method for outputting and displaying display information from the main computer, an address scheduled to correspond to the display information storage section of the main memory in the main computer from the display output device side; The data corresponding to the address in the main memory is output via an input/output device provided in the main computer that performs input/output to the main memory using a direct memory access method. The purpose is to perform readout, output display processing.

The non-invention will be described in detail below with reference to the same page.

The configuration of the unexploded IJl〇-embodiment is shown in FIG. In FIG. 2, the same reference numerals are used for the same parts as in FIG. 1. The main computer IA connects the main memory IJK to the CPU1. ? and an MA controller 14 which is capable of transferring data to the main memory 13 in DMA mode. The DMA controller 14 controls an input/output device 15 as an interface means between the two display output devices. Display output device Two people control the whole tone, for example, the display amount configured using a microprocessor, etc., the controller? ff1A and
A digital input device 21 and a digital output device 24 are controlled by this controller 22 and serve as interface means with the main computer 7A, and a digital output device 23-1 drives the displays 31 to 3n of the monitoring panel 3.
~23-n.

The DMA controller 14 operating in the DMA mode and the input/output device 15 in the main computer IA have the following operational functions.

When the data address of the main memory 13 is input with a ready signal added to the input section of the input/output device 15, DMA:0:1
'y The set of data in the main memory 13 specified by the data address is outputted to the output section of the input/output device 15 by the troller 1 and the input/output device 15. That is, main memory 1
Any data can be freely read out at any time without going through the program processing of the CPU 12.

That is, in this embodiment, using the above-mentioned functions, the two display output devices output unnecessary display information data in the main memory 13 of one main computer to the controller and 722k from the main one slave computer IA, In order to input the data to the two display output devices, predetermined address data corresponding to the address where the data is stored is sequentially output from the output device 24 with a ready signal attached.

According to this method, the display output device for two people is the main computer 10.
Necessary data can be inputted one after another through the input device 21 at the timing that it generates itself, without going through the processing of the CPUs x, x.

The input data is compared with the previously input data in the controller 22A, and if there is a signal in which a state change is detected, it is subjected to flicker processing, for example, and output to the display drive output devices 23-1 to 23. -n is output, monitoring board 3
The display contents of the displays 31 to 3n are changed and the latest status is sequentially displayed.

In the above embodiment, the case where the man-machine interface device is the monitoring panel 3 equipped with a large number of indicator lights as the indicators 31 to 3n has been explained.
Similar implementations can be made for RT (cathode ray tube) display devices.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

As detailed above, according to the present invention, when a display output device, which is a conventional man-machine interface device, is configured as a peripheral device of a main computer, output processing to the peripheral device is performed using a conventional method. and the load on the main computer,
However, the display speed of multiple state changes tended to be slow, but the display speed can be set freely without interfering with other processing in the main computer, and there is no delay in the output of state changes. A display output method that can effectively prevent this can be provided.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a conventional system, and FIG. 2 is a system configuration diagram of an embodiment of the present invention system. IA...Electronic computer, 2 people...Display output device, 3.
...Monitoring panel, 12...Central processing unit (CPU)
, 13-... Main memory, 14... Direct memory access (DMA) controller, 16... Input/output device, 21... Digital input device, 22A... Display output controller, 2B-1 to 2B -n, 24...Digital output device, 31 to 3n...Display device.

Claims (1)

[Claims] In a display output method for outputting and displaying display information from the main computer, an address scheduled to correspond to the idle information and information storage section of the main memory in the main computer is output from the display output device side, and The data corresponding to the address in the main memory is read and outputted using the direct memory access method through an input/output device installed in the main computer that performs input/output to the main memory IJK using the direct memory access method. A display output method characterized by having a configuration for processing.