JPS60207915A - How to display intermediate calculation results in a compiler-type sequence controller - Google Patents

Abstract

PURPOSE:To extract and display an arithmetic result on the way of arithmetic optionally by starting an arithmetic result displaying program with an interruption based upon an output signal formed on the basis of a display request signal. CONSTITUTION:An interruption controller 6 interrupts a CPU2 in accordance with a display request signal Vd. The CPU2 rewrites the succeeding instruction of an instruction providing a required arithmetic result in a sampling program by an output instruction Od. Since the output instruction Od is supplied to the controller 6, the controller 6 interrupts the CPU2. Consequently, the arithmetic result displaying program is started and the required arithmetic result on the way is stored in a memory 4. The arithmetic result on the way stored in the memory 4 is outputted to a printer or the like. Thus, the arithmetic result on the way of arithmetic can be optionally fetched and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a method for displaying intermediate calculation results in a Funbaira type sequence controller.

(b) Prior Art General 1. In a sequence controller, when a result in the middle of a calculation is retrieved and displayed, it is necessary to temporarily store the result in a memory. If it is an ink interpreter type, the instructions are translated into machine language and executed each time, so the results of sequential operations are necessarily stored in memory.

Therefore, intermediate calculation results can be freely extracted and displayed. However, in the compiler version,
Since the entire program is translated into derogatory language and then executed, in order to display the results of an intermediate operation, after a certain operation, a separate operation must be performed to store the result of this operation in memory. If a memory store calculation function is added to all sequential calculations for this processing, not only will a large storage capacity be required, resulting in high costs, but also the calculation processing time will become long, reducing efficiency. It's bad.

For this reason, with conventional compiler-type sequence controllers, it has been difficult to arbitrarily extract and display intermediate calculation results.

(c) Objective The present invention aims to solve the above-mentioned conventional problems and to make it possible to arbitrarily extract and display the results of a computation in the middle of a computation without adding a separate computation function for memory storage.

(D) Structure In order to achieve such an object, the present invention rewrites the next instruction of the instruction that obtains the desired intermediate operation result in the sequence program into an output instruction in response to a display request signal. The present invention is characterized in that an interrupt is generated by an output signal obtained by executing the changed output instruction, and the interrupt activates a calculation result display program that stores intermediate calculation results in memory.

(E) Example Hereinafter, the present invention will be explained in detail based on an example shown in the drawings. FIG. 1 is a block diagram showing the main parts of a sequence controller applied to the present invention. In the figure, 1 is a sequence controller, 2 is a CPU that can accept interrupts, 4 is a memory that accesses this CPU 2, and 6 is an interrupt controller that controls several types of interrupts. The interrupt controller 6 receives an output signal Od based on an output command from the CPU 2, a sampling clock C1 for starting sequence calculations at regular intervals, and a display request signal Vd for displaying intermediate calculation results. Hmph, Troller 6 is this individual power believer Oc1. An interrupt signal 1r is output to the CPU 2 in response to CI and Vd. In this case, the interrupt levels are set for the output signal Od, the sampling clock CI, and the display request signal Vd from the highest level.

The CPtJ2 receives the interrupt signal 1r from the interrupt controller 6 and can determine which type of interrupt has occurred. Further, the memory 4 stores in advance sequence programs including a display request program, a sampling program, a calculation result display program, and the like.

Next, the procedure for displaying intermediate calculation results in the sequence program 1 will be explained with reference to the second flash.

First, a display request signal Vd is input to the interrupt controller 6 by keystrokes or the like. Then, in response to this, the interrupt controller 6 sends an interrupt signal 1.
Since r is output, this interrupt signal I' is output as CPtJ.
Give to 2. When CPLJ2 accepts an interrupt, a display request program is called. By executing this display request program, the next instruction of the instruction in the sampling program stored in the memory 4 that yields the desired intermediate calculation result is rewritten into an output instruction. At the same time as this rewriting, the display request program itself is placed in a wait state. In this wait state, when a sampling clock C1 for starting a sequence operation is applied to the interrupt controller 6 from a pulse generation circuit or the like, the interrupt controller 6 outputs an interrupt signal 1r in response and sends it to the CPU 2. . When the CPLI 2 receives this interrupt, the sampling program is started. This causes the sequence calculation to be executed.

During execution of the sequence operation, the desired intermediate operation result is obtained and 2.7) Since the instruction following the instruction has already been rewritten to an output instruction, the CPLJ2 outputs an output signal Od based on this output instruction, This is given to the interrupt controller 6. The interrupt controller 6 generates an interrupt signal 1r in response to the output signal Od from the CPU 2, and sends it to the CPU 2 again. Therefore, CPU 2
When it accepts this interrupt, the calculation result display program is started. By executing the calculation result display program, the CPU 2 stores the desired intermediate calculation result obtained by the sequence calculation in the memory 4, and then restores the output command of the sampling program to the original command, thereby terminating the interrupt processing. Then, the sequence operation is continued again from the restored instruction of the sampling program, that is, the instruction next to the instruction for which the intermediate operation result was obtained. When the sequence calculation is completed, the display request program that has been in a wait state is restarted and the intermediate calculation results stored in the memory 4 are output to a printer, CRT, etc.

(f) Effects As described above, according to the present invention, the function W for memory store,
This means that it is possible to arbitrarily extract and display the results of a computation without adding any additional functionality. Furthermore, the opening time during arithmetic processing is short and efficient. Therefore, an excellent practical effect can be obtained in that a display similar to that of an interpreter type is possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram showing the main parts of a sequence controller, and FIG. 2 is an explanatory diagram of a procedure for displaying intermediate calculation results. 1 is a sequence controller, 2 is a CPtJ, 4 is a memory, 6 is an interrupt controller, Od is an output signal, Ir
is an interrupt request signal. Applicant Shimadzu Corporation Representative Patent Attorney Kazuhide Enda Figure 1

Claims (1)

[Claims] (1) In response to a display request signal, rewrite the instruction following the instruction that yields the desired intermediate operation result in the sequence program to an output instruction, and interrupt with the output signal obtained by executing the rewritten output instruction. 1. A method for displaying intermediate calculation results in a compiler-type sequence controller, characterized in that the interrupt activates a calculation result display program that stores the intermediate calculation results in memory.