JPS60160466A - Device for controlling hierarchical sequence - Google Patents

Abstract

PURPOSE:To lessen speed slowdown in sequence control action by buffer operation by transferring data according to a write pointer value and by performing buffer read/write according to the values of read and write pointers. CONSTITUTION:A data processor MOPC judges the presence of a data write request by data write processing MWT, and if there is a request, the MOPC writes the data in a window WD. The sequence controller SQ side performs data transfer processing CPY by firmware of the sequence controller to judge whether there is such data in the window WD. When there is any data, they are written in a data buffer BUF according to the values of a write pointer WPT. When there is a request, buffer readout processing SRD reads out data from the data buffer BUF according to the read pointer RPT.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a sequence control device comprising a hierarchical connection of a plurality of data processing devices.

When high-speed sequence control and highly versatile data processing are required, a hierarchical data processing device is used, with a high-speed data processing device dedicated to sequence control at the bottom and a general-purpose data processing device at the top. be done.

The lower data processing device dedicated to sequence control operates at high speed according to a program written using microinstructions, and the upper data processing device operates at a relatively slow speed according to a program written using general-purpose language 8a such as BASrC. . Transferring data between such data processing devices
When receiving data, the higher-level data processing device must read all the data generated at high speed in the lower-level sequence control-dedicated data processing device. Therefore, a buffer is provided between the upper data processing device and the lower sequence IIJm device to absorb the difference in operating speed between the two.

<Conventional Example> Conventional general buffers require relatively complicated procedures for their operation, so if the sequence control device performs high-speed sequence lli control, the influence of the buffer operation may be reduced. The decrease in the speed of sequence control operation cannot be ignored.

An object of the present invention is to provide a buffer for exchanging data between a lower data processing NI device dedicated to sequence control that operates at high speed and an upper data processing device that operates at a slower speed. The object of the present invention is to provide a hierarchical sequence control device having a buffer that does not impair the high speed performance of lower-order data processing devices as much as possible.

<Main points> The present invention uses a data processing device that operates with a program written in a general-purpose language as the upper data processing device, and a data processing device dedicated to sequence control that operates with a program written in microinstructions as the lower data processing device. A hierarchical sequence control device is used as a device, and the upper data processing device performs a data write process of writing data into the window of the lower data processing device, which will be described later, and a data buffer of the lower data processing device, which will be described later. The lower data processing device includes a window for temporary data storage, a data buffer, and a read pointer of the data buffer. a write pointer of a data buffer; a data transfer process for writing the data written in the window into the data buffer according to the value of the write pointer; reading the data of the data buffer 1 according to the value of the read pointer; Buffer successive processing to update the value of the read pointer, and data to the data buffer according to the value of the write pointer? The above object has been achieved by a hierarchical sequence control device having a buffer self-transfer process that writes to the write pointer and updates the value of the write pointer.

<Example> Hereinafter, the present invention will be described in detail based on Examples.

<Senari> FIG. 1 shows a hardware configuration diagram of an embodiment of the present invention.

In FIG. 1, MOPC is a higher-level data processing device, and an operator operation 1 [DISP] consisting of a display CRT and an operation device KEY is connected to this. SQ is a lower data processing unit dedicated to sequence control. ! A device that performs upper-level data processing through the interface IF.
Connected to 1M0PC. Upper data processing device MOP
C and the lower sequence control device 1tsQ each have a processor and a memory, and perform predetermined operations according to programs and data stored in the memory.

The lower sequence system t[I @SQ is the upper data processing 1! Data serving as parameters for sequence control are set from the MOPC, and sequence control determined by the set parameters is executed. The higher-level data processing device MOPC reads process data, sequence control parameters, etc. through the sequence MIIl device 1ffsQ as necessary.

FIG. 2 is a software configuration diagram of the embodiment of the present invention, focusing on data exchange between the upper data processing device MOPC and the lower sequence control device SQ. In Figure 2, MWT is a data write processing program, MR
D is a data read processing program, which is provided in the upper data processing device MOPC.

CPY is a data transcription processing program, SWT is a buffer writing processing program, SRD is a buffer reading processing program, WD is a data writing window, BLI
F is a data buffer, RPT is a data buffer read pointer, and WPT is a data buffer write pointer, which are provided in the lower sequence control unit @SQ. Hereinafter, each of the above processing programs will be simply referred to as processing.

The data write process MWT is for writing data to be given to the sequence control device SQ into the window WD. Note that the window WD is the upper data processing device MOP.
This is temporary storage used when providing data of C to the sequence system tII device SQ. Data read processing MRD transfers data from data buffer BUF to read pointer R.
It is read according to the address indicated by PT. The value of the read pointer RPT is advanced by one each time one piece of data is read. These data writing and reading processes are performed based on requests given by the operator through the operator operating device DISP or requests generated during program execution.

The data transfer process 1ICPY transfers the data of the window WD to the data buffer BUF. Writing to the data buffer BUF is performed using the write pointer W P T
This is done according to the value of Each time one piece of data is written, the pointer is advanced by one. The buffer successive processing SRD is for reading data from the data buffer BUF. Reading is performed according to the value of read pointer RPT, and the pointer is advanced by one each time reading is performed. The buffer write processing SWT transfers data from the sequence control device to the upper data processing device MOPC into the data buffer BUF.
This is what you write in. Write using write pointer WPT
The pointer is advanced by one each time it is written. These processes are configured by microprograms and are executed at high speed as seven cycles of a sequence control program.

FIG. 3 shows such a software configuration in more detail.

Operation> The operation of the apparatus according to the embodiment of the present invention will be explained below with reference to FIG.

FIG. 3(a) is a software configuration diagram when data is supplied from the data processing bag WMOPC to the sequence control m device SQ, and FIG.
FIG. 2 is a software configuration diagram when data is supplied from Q to a data processing device MOPC.

First, as shown in FIG. 3(a), the data processing device MOP
To explain the case where data is supplied from C to the sequence control device SQ, the data processing device MOPC uses the data write processing MIMWT to determine whether or not there is a data write request in its determination section, and if there is a request, the data is written to window WD.

On the sequence control I device SQ side, data transfer processing CP
Y is being executed at high speed as one of the firmware of the sequence control device, and its judgment section displays the window WO.
It is determined whether there is data in the data buffer or not, and if there is data, the data is stored in the data buffer according to the value of the write pointer WPT. It is written to BUF and the pointer is advanced by one. This process is performed prior to execution of the sequence control program.

Buffer read processing SR[) determines whether or not there is a data read request in its determining unit, and when there is a request, data buffer BLIF is processed according to the value of read pointer RPT.
Data is read from , and the pointer is advanced by one. This process is performed after sequence control is executed.

These processes on the sequence control ilj device SQ side are repeatedly executed at high speed as part of the sequence control operation. These processes consist of a simple procedure of writing and reading data into the data buffer according to the pointer, and updating the pointer.
l A decrease in the operating speed of sequence control due to this processing is not a problem.

Next, according to FIG. 3(b), the sequence control device ff1s
To explain the case where data is given from Q to the upper data processing device MOPC, the sequence control device SQ will:
Data buffer B is written by buffer write processing SWT.
Write data to UF. That is, the determination unit determines whether there is a write request, and if there is a request, the data buffer BUF is written in accordance with the value of the write pointer WPT, and the pointer is advanced by one. This process is also a simple process similar to the data transfer process described above.

The data written in the data buffer BLJF is read by data reading processing MRD of the upper data processing device. In other words, the determination unit determines whether there is a request to read data, and if there is a request, the data buffer BUF is read out according to the value of the read pointer, and the pointer is updated. According to the invention, there is provided a buffer 1 for transmitting and receiving data between a low-order data processing device dedicated to sequence control that operates at high speed and a high-order data processing device that operates at a slower speed, It is possible to realize a lim-type sequence control device having a buffer that does not impair the high speed performance of the lower data processing device as much as possible.

[Brief explanation of drawings]

FIG. 1 is a hardware configuration diagram of an embodiment of the present invention, FIG. 2 is a software configuration diagram of an embodiment of the invention, and FIG. 3 is a detailed diagram of FIG. 2. MOPC...Upper data processing device SQ...Lower sequence tilJiIll dedicated data processing device F...Interface DISP...Operator operation device Agent Patent attorney Shinsuke Ozawa Figure 1

Claims (1)

[Scope of Claims] A data processing device that operates with a program written in a general-purpose language is defined as an upper data processing device, and a data processing device dedicated to sequence control that operates with a program written in microinstructions is defined as a lower data processing device. A hierarchical sequence opening device, in which the upper data processing device performs a data write process of writing data to the window of the lower data processing device, which will be described later, and a data read process from the data buffer of the lower data processing device, which will be described later. a data read process for reading data according to the value of the pointer and updating the value of the read pointer; a write pointer of a data buffer; a data transfer process for writing the data written in the window into the data buffer according to the value of the write pointer; and a data transfer process for reading the data of the data buffer according to the value of the read pointer and setting the read pointer. A hierarchical sequence control device comprising: a buffer successive process for updating a value; and a buffer write process for writing data into the data buffer according to the value of the write pointer and updating the value of the write pointer.