JP5162190B2 - Programmable display and system - Google Patents

Description

The present invention relates to a system comprising a programmable display device and the programmable display device for processing a plurality of functional efficiently.

Conventionally, a programmable display is used as a device for displaying information of a PLC (programmable controller) that controls a device used in a production line of a factory.
FIG. 3 is a conceptual diagram of a system including a conventional programmable display.

The conventional system 300 includes a programmable display 301, a PC (personal computer) 310, and an external device 320.
The programmable display 301 includes a first serial port 302 and a second serial port 303.

The external device 320 includes an external device memory 321, a first serial port 322, a second serial port 323, and an Ethernet port 324.
First serial port 302 of the programmable display device 301 are connected via a serial line 304 to the first serial port 322 of the external equipment 3 20.

  The user creates screen setting data for setting the operation of the programmable display 301 with screen creation software installed in the PC 310. Specifically, the user sets which area of the external device memory 321 in the external device 320 is used for each function executed by the programmable display 301.

Examples of functions of the programmable display 301 include screen display and sampling.
In the programmable display 301 of FIG. 3, the function A, the function B, and the function C are stored in the external device memory 321-1, the external device memory 321-2, and the external device memory 321-3, respectively. Screen setting data is created for access.

The user transfers the set screen setting data to the programmable display 301. The programmable display 301 operates based on the data.
FIG. 4 is a diagram showing a flow of processing of a conventional programmable display.

In FIG. 4, the programmable display 301 executes functions A to Z for accessing the external device memories A to Z, respectively.
The programmable display 301 processes the functions A to Z in series (in order) using the serial port 302. That is, when the function A has been executed, the programmable display 301 is executing only one function so that the function B is started.

Patent Document 1 describes a programmable display that can extend a directly accessible object to other than the internal memory of the PLC.
JP 2004-133806 A

  A conventional programmable display unit processes a plurality of functions (tasks), for example, a function performed at an indefinite period and a function performed at a constant period in series in one communication process, that is, in order, and transfers data only to one line. I went there. Therefore, if the irregular period function handles a large amount of data, if the irregular period function takes time, the regular period function cannot be executed until the irregular period function ends. There was a problem that the necessary functions could not be executed regularly.

  An object of the present invention is to provide a programmable display capable of periodically executing a function that must be periodically executed even when a function performed at an indefinite period handles a large amount of data.

The present invention employs the following configuration in order to solve the above problems.
That is, according to one aspect of the present invention, the programmable display of the present invention is a multi-task programmable display that is connected to an external device and displays data of the external device. And a second communication means, and based on a table in which the property of access to the external device of the programmable display device is set in advance, the external device among the plurality of functions executed by the programmable display device is set to a fixed period or high speed The function of accessing the data and acquiring the data is set to be performed by the first communication means, and the function of displaying the data acquired by accessing the external device at an indefinite period on the programmable display is performed by the second communication means. set to the first second using the first communication process and the second communication means using communication means It executes the signal processing in parallel.

According to one aspect of the present invention, the system of the present invention includes an external device and a multi-task programmable display that displays the data of the external device connected to the external device. Storage means, and first and second communication means, wherein the programmable display includes first and second communication means, and presets the nature of access to the external device of the programmable display Based on the table, a function for acquiring data by accessing the external device at a fixed cycle or at a high speed among a plurality of functions executed by the programmable display is set to be performed by the first communication means, and the external device is set. access to retrieve data indeterminate period is set to perform a function for displaying on the programmable display device in the second communication unit, before The first communication process using the first communication unit and the second communication process using the second communication unit are executed in parallel, and the first and second communication units of the programmable display are The external devices are connected to the first and second communication means, respectively.

  According to the present invention, it is possible to reliably execute a function that must be performed periodically.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram of a system including a programmable display according to an embodiment of the present invention.

  A system 100 including a programmable display according to an embodiment of the present invention includes a programmable display 101, a PC (personal computer) 110, and an external device 120. The programmable display 101 includes a central processing unit that executes each process and a memory that stores screen setting data described later.

  The programmable display 101 includes a first serial port 102 and a second serial port 103. The programmable display 101 is compatible with multitasking, and can process a plurality of functions (tasks) in parallel (simultaneously).

The external device 120 includes an external device memory 121, a first serial port 122, a second serial port 123, and an Ethernet port 124.
The first serial port 102 and the second serial port 103 of the programmable display 101 are connected to the first serial port 122 and the second serial port 122 of the external device 120 via serial lines 104 and 105, respectively. Yes.

  In this embodiment, a serial port is used to connect to an external device. However, the connection is not limited to a serial port, and a USB (Universal Serial Bus), an Ethernet port, or the like may be used.

  The user creates screen setting data for setting the operation of the programmable display 101 with screen creation software installed in the PC 110. Specifically, the user sets the operation of each function executed by the programmable display 101 and which area of the external device memory 121 in the external device 120 is used for each function.

Examples of functions of the programmable display 101 include screen display and sampling.
In the embodiment of FIG. 1, the functions A, B, and C access the external device memory 121-1, the external device memory 121-2, and the external device memory 121-3, respectively, in the external device memory 121. The screen setting data is created.

  In the embodiment, the function A is a function that needs to access the memory of the external device 120 at a fixed cycle such as sampling, and the function B is stored in the memory of the external device 120 at a fixed cycle such as screen display. It is a function that does not need to be accessed, and function C is a function that needs to access the memory of the external device 120 at high speed.

The user transfers the set screen setting data to the programmable display device 101. The programmable display 101 operates based on the data.
The programmable display 101 determines whether the function A, the function B, and the function C are to be processed by the communication process A or the communication process B, and executes the communication processes A and B in parallel.

In the embodiment of FIG. 1, functions A and C are processed by communication process A, and function B is processed by communication process B.
The communication process A uses the serial port 102 to exchange data with the external device 120, and the communication process B uses the serial port 103 to exchange data with the external device 120.

Data acquired from the external device 120 is used for data display, storage in a storage provided in the programmable display 101, and the like.
Since the programmable display 101 supports multitasking, the communication processes A and B can be operated in parallel. Since the communication processes A and B use different serial ports, the communication processes A and B are Each process can be executed without being influenced by each other.

FIG. 2 is a diagram showing a process flow of the programmable display device according to the embodiment of the present invention.
In the embodiment of FIG. 2, a case will be described in which the programmable display unit executes functions A to Z for accessing the external device memories A to Z, respectively, among the external device memories.

In step S201, functions A to Z for accessing the external device memories A to Z are arranged in the order of processing. Although the order of arrangement is arbitrary, the functions A to Z are arranged in this order. Among the arranged functions, one of the functions that have not yet been determined as to whether to process in communication processing A or B is selected in the order in which they are arranged. For example, the function A is first selected, it is determined which function A is to be processed, and when the process returns to step S201, the function B is selected next.

In step S202, if the property associated with the function selected in step S201 of the data table is fixed cycle or indefinite cycle access , the process proceeds to step S203, and the property associated with the function selected in step S201 of the data table. If is high speed or low speed access , the process proceeds to step S207. The nature of the selected function is predetermined for each function, and can be determined using, for example, a data table in which the function and the property are associated with each other. The determination is similarly performed in steps S203 and S207. For example, the function for sampling data is for accessing at regular intervals, and the function for displaying is for accessing irregularly.

In step S203, the function determines whether periodic memory access is required. If necessary, the process proceeds to step S204. If not necessary, the process proceeds to step S206.
In step S204, the function is set to be performed in the communication process A.

In step S205, it is determined whether distribution has been completed for all functions. If completed, the process proceeds to step S211, and if not completed, the process returns to step S201.
In step S206, the function is set to be performed in the communication process B.

In step S207, it is determined whether or not the function requires high-speed memory access. If necessary, the process proceeds to step S20 8, if it is not needed proceeds to step S21 0.
In step S208, the function is set to be performed in the communication process A.

In step S209, it is determined whether distribution has been completed for all functions. If completed, the process proceeds to step S211, and if not completed, the process returns to step S201.
In step S210, the function is set to be performed in the communication process B.

In step S211, communication processes A and B are executed in parallel. The communication process A uses the serial port 102 and the communication process B uses the serial port 103 for communication.
Since the programmable display 101 of the present embodiment is compatible with multitasking, the communication processes A and B can be executed simultaneously, and the communication processes A and B communicate with each other through different serial ports. Even when a large amount of data is handled in the communication process B, the communication process A can communicate without being affected by it.

  Therefore, it is possible to reliably execute a function that must be periodically executed, for example, periodically acquire data of an external device. In addition, it is possible to preferentially process a specific external device memory that requires high speed. Furthermore, since the processing is divided into a function for performing periodic memory access and a function for performing irregular memory access, the processing of a display task that performs irregular memory access is reduced.

It is a conceptual diagram of the system containing the programmable display which concerns on embodiment of this invention. It is a figure which shows the flow of a process of the programmable display which concerns on embodiment of this invention. It is a conceptual diagram of the system containing the conventional programmable display. It is a figure which shows the flow of a process of the conventional programmable display.

Explanation of symbols

100 System 101 Programmable Display 102, 103 Serial Port 104, 105 Serial Line 110 PC
120 External device 121, 121-1, 121-2, 121-3 External device memory 122, 123 Serial port 124 Ethernet port 300 System 301 Programmable display 302, 303 Serial port 304 Serial line 310 PC
320 External device 321, 321-1, 321-2, 321-3 External device memory 322, 323 Serial port 324 Ethernet port

Claims (2)

In a programmable display for multitasking that displays data of the external device connected to the external device,
The programmable display is
Comprising first and second communication means;
Based on a table in which the nature of access to the external device of the programmable display is set in advance , the function of acquiring data by accessing the external device at a fixed period or at high speed among a plurality of functions executed by the programmable display Set to be performed by the first communication means , set the second communication means to perform the function of displaying the acquired data by accessing the external device at an indefinite period on the programmable display ,
A programmable display device, wherein a first communication process using the first communication unit and a second communication process using the second communication unit are executed in parallel. In a system comprising a multitask compatible programmable display that displays data of the external device connected to the external device and the external device,
The external device is
Storage means;
First and second communication means;
With
The programmable display is
Comprising first and second communication means;
Based on a table in which the nature of access to the external device of the programmable display is set in advance , the function of acquiring data by accessing the external device at a fixed period or at high speed among a plurality of functions executed by the programmable display Set to be performed by the first communication means , set the second communication means to perform the function of displaying the acquired data by accessing the external device at an indefinite period on the programmable display ,
Executing in parallel a first communication process using the first communication means and a second communication process using the second communication means;
The system according to claim 1, wherein the first and second communication means of the programmable display are connected to the first and second communication means of the external device, respectively.