JPS58181388A - Program managing method of remote monitor controller - Google Patents

Abstract

PURPOSE:To process plural tasks easily with good accuracy, by providing a timer controlling a processing time of a central operation processor processing plural tasks cyclicly. CONSTITUTION:When the number of tasks to be processed is three, the processing time of each task by a CPU3 is T1-T3, an output time of a control signal from a timer 9 is taken as T and programmed in advance. When a control signal of high level is outputted from the timer 9, it is discriminated at the CPU3 and the processing of each task is done sequentially. A control signal of low level is outputted after the time T, the processing of one period of the CPU3 is finished and the processing for the 1st task only is done. The cycles above are repeated and the 1st - the 3rd tasks are processed cyclicly. Plural tasks are processed easily with good accuracy with a simple program like this.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a program management method for a remote monitoring and control device, which allows a plurality of tasks to be easily and accurately processed.

In general, program management methods for remote monitoring and control equipment include:
There are a method using so-called interrupts and a method not using interrupts, and each method is implemented by a device as shown in FIG. 1(a) and FIG.

First, in Fig. 1 fa), (1) is a timer that receives a clock pulse P from a clock oscillation circuit (not shown) and outputs a timer control signal, and (2) is a timer that receives a timer control signal and outputs a timer control signal. The interrupt controller (3) that outputs the interrupt signal is a central processing unit (hereinafter referred to as CPU) that processes multiple tasks in response to the interrupt signal from the interrupt controller r21. A high-level timer control signal that is output for a predetermined period of time causes the interrupt controller (2) to
(3) A high level interrupt signal is output to the CPU
In step (3), the interrupt signal is determined and a task corresponding to the interrupt signal is processed, and by repeating these steps, a plurality of tasks are cyclically processed. Furthermore, (4)
is the control bus.

However, in the above case, a so-called erroneous interrupt, in which the processing by the CPU (3) K shifts from the current task to the next task, is likely to occur due to noise or power fluctuations, etc.
It is not possible to process multiple tasks with high accuracy, and an interrupt controller (2) is required to perform interrupts, which complicates the device.

Therefore, as shown in FIG. 1(b), instead of using interrupts as shown in FIG. 1(a), the CPU
+a3 processes multiple tasks cyclically, but in this case, it is necessary to program how and in what order multiple tasks are processed, making the program complex. It also involves a huge amount and requires a lot of time and effort.

This invention was made with the above points in mind,
Next, this invention will be explained in detail with reference to the drawings from FIG. 2 onwards showing an embodiment thereof.

(6) is the first gate connected to the CPU [3] via the control bus (B), and (7) has both input terminals connected to the first gate (6).
) and the flip-flop circuit section (8) are respectively connected to the output terminal of the clock circuit (CL) and the address bus (B)', and the two input terminals of (8) are respectively connected to the clock circuit (CL) and the output terminal of the flip-flop circuit section (7). and gate, (
9) is a timer whose input terminal is connected to the output terminal of AND gate (8), 00 is a person, and the output terminal is a timer (9).
) and the other input terminal of the AND gate (8), αυ has both input terminals equal to 47 7 ÷ (9)
and a second gate connected to the output terminal of the address bus (B)' and the address bus (B)', respectively.

The task to be processed now is the first task. Second. Third task 8
, the processing time of each task by the CPU (3>) is TI, T2, 'ra, respectively, and the output time of the control signal from the timer (9), that is, the processing time of one cycle of the CPU (3) T(L
T+4-T2+T8), and the processing cycles of each task are 1 and 2.8, respectively, and these conditions are programmed in advance. When a high-level control signal is output from the timer (9) according to the program, the CPU r3) determines that the timer (9) is outputting a high-level control signal, and the timer During the period when the high level control signal is being outputted from the timer (9), as shown in FIG. After time T from the start of output, a low-level control signal is output, and at the same time one cycle of processing of the CPU f3) is completed, a high-level control signal is output again from the timer (9), and in the same way as above, CPU according to the program
f3), only the first task is processed, and as shown in Figure 8, these cycles are repeated to process the first to
A third task is processed cyclically.

Therefore, by providing the timer (9), a plurality of tasks can be easily and accurately processed by a simple program without causing erroneous interrupts as in the conventional case.

As described above, according to the program management method for a remote monitoring and control device of the present invention, a timer is provided to control the processing time of a central processing unit that cyclically processes a plurality of tasks, and the timer is controlled by the central processing unit. In addition to determining that a control signal is being output from
By allowing the central processing unit to process each of the tasks during the period when the control signal is output from the timer, a plurality of tasks can be easily and accurately processed.

[Brief explanation of the drawing]

1(a) and (I are block diagrams of a conventional program management method for a remote monitoring and control device, respectively, and FIG. 2 and the following drawings show an embodiment of the program management method for a remote monitoring and control device of the present invention, Fig. 2 is a block diagram, and Fig. 3 is an operation explanatory diagram.

Claims (1)

[Claims] ■ A timer is provided to control the processing time of a central processing unit that cyclically processes multiple tasks, and the central processing unit determines that a control signal is output from the timer, and A program management method for a remote monitoring and control device, characterized in that each task is processed by the central processing unit during a period when a signal is being output.