JPH0744094A - Programmable controller - Google Patents

Abstract

PURPOSE:To eliminate the switching operation by an operator in the case of the data exchange between a programmable controller (PC) and a monitor device or a programming device by discriminating either one of the exchange instructions between the PC and the monitor device or the programming device. CONSTITUTION:A parallel series converter 41 converts the parallel data of a monitor device 3 and a programming device 4 into series data. When an operator conducts a programming by using a touch panel, the device 4 transmits a request communication message for communication via a strobe signal, a PC 1 judges that there is a communication message and discriminates whether it is a communication request with the device 3 or not from the contents of the received communication message. If the request is not with the communication request with the monitor device 3, then, it is discriminated as a communication request with the device 4. If it is a communication request, the device 4 judges it to be a communication request with the PC 1. And the received communication message is memorized in a prescribed address of the RAM of the device 4 and the communication between the PC1 and the device 4 is accomplished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of data transmission / reception between a programmable controller (hereinafter referred to as a PC) and a peripheral device of the PC.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. In FIG. 5, reference numeral 1 is a PC main body, 2a is a program memory for storing a program whose control procedure is described in a dedicated language, 2b is a data memory for storing a calculation result in a calculation unit, and 2c is a CPU, which is the operation unit of PC1, 2
d is an interface for connecting the peripheral device to the PC 1, 3
Is a monitor device for monitoring the controlled object, 4 is a program maker, and has a changeover switch 5 for switching between the monitor device 3 and the program maker 4. PC1
The peripheral devices include a program creator 4 that creates or modifies a program and stores it in the program memory 2a of the PC 1, and a monitor device 3 that reads out and displays the status of the control target of the PC 1 from the data memory 2b of the PC 1. These two types of functions are generally independent devices, not integrated devices. This is a PC
The program creation machine 4 is indispensable from the essence of the PC 1 that creates or modifies the program 1 to control various controlled objects, whereas the monitor device 3 does not necessarily have to display the status of the controlled object of the PC 1. However, if one monitor device is provided, it can be used for another PC 1. Therefore, it is costly to integrate the PC1.
This is because the peripheral device of becomes unnecessarily large.

Reference numeral 21 is a RAM for storing monitor display data, 22 is a ROM for storing display screen data and monitor setting data, and 23 is a display section including a CRT for visually displaying the monitor contents. Reference numeral 24 denotes an input unit including a touch panel for the operator to input keys, 2
Reference numeral 5 is a monitor CPU that performs calculation for monitoring the controlled object, and 26 is an interface for connecting to the PC 1. Reference numeral 31 is a RAM that stores data for creating a program, 32 is a ROM that is a memory for storing display screen data and program setting data, and 33 is a PC 1
Of the CRT for displaying the program creation or correction of the program, 34 is an input section composed of a touch panel for the operator to input keys for program creation or modification, and 35 is a calculation for program creation and the like. CP to do
U and 36 are interfaces for connecting to the PC 1.

Next, the operation will be described with reference to the flowchart of FIG. When the monitor device 3 communicates with the PC 1, the operator tilts the changeover switch 5 to the 12 side. As a result, communication between the program creator 4 and the PC 1 becomes impossible. When a strobe signal is transmitted from the monitor CPU 25 to the control target monitor request, that is, a transmission request to the receiving side PC1 (step 101), when the PC1 prepares for reception and becomes receivable, an affirmative response is sent to the monitor device 3
The contents to be transmitted to and monitored are read from the RAM 21 (step 102), the monitor contents are executed using the monitor CPU 25 and displayed on the CRT 23 (step 103). When the data transmission is completed, the transmission end signals are issued to each other and the processing ends. Unless there is a transmission request from the monitor device 3, the request is kept waiting (step 101).

When the program creator 4 communicates with the PC 1, the operator pushes the changeover switch 5 to the 13 side. As a result, communication between the monitor device 3 and the PC 1 becomes impossible. When a strobe signal is transmitted from the CPU 35 to a program creation or modification request, that is, a transmission request to the PC 1 on the receiving side (step 111), the operator inputs the content of program creation etc. (step 112),
When the PC 1 prepares for reception and becomes ready for reception, it sends an affirmative response to the program creator 4 to read the contents of the program creation etc. from the RAM 31 and execute the program creation etc. using the CPU 35 (step 113), and the CRT 33.
Is also displayed. When the data transmission is completed, the transmission ends mutually and ends (step 114). Unless there is a transmission request from the program creator 4, the request is kept waiting (step 111).

When communicating data with the monitor device 3 and the PC 1, if the program creator 4 and the PC 1 are communicating data, the operator must switch the switch 5 on the monitor device 3 after stopping the communication. The operation was troublesome. Also, when data communication is performed between the program creator 4 and the PC 1, the same operations as above must be performed.

To display the monitor contents of the controlled object of the PC 1 on the CRT 23 of the monitor device 3, the monitor device 3
When it is necessary to store the position data, the display image, etc. as the storage content of the ROM 22, the change of the monitor content of the control target of the PC 1 is not easy. In particular, when the PC 1 is used in an FA system to display monitor contents such as production control, there has been a strong demand for the above change due to changes in the production process.

When it is desired to display the monitor contents of the past controlled object on the CRT 23 of the monitor device 3 for inspection of the controlled object, etc., the CRT 23 displays the current monitor contents, so that the printer or the like displays it on the recording paper. Had to display.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art, and its purpose is to perform data communication between a PC and a monitor device or a program creator. In this case, the operator has to eliminate the work of switching the switches.

Another object is to make a storage device such as a ROM of a PC device store in advance position data relating to the monitor display contents, a display image, etc., and control the monitor device by the PC to facilitate the display contents of the monitor. To change.

Still another object is to enable display of past monitor contents, which is a control target of the PC, on the CRT.

[0012]

A programmable controller device according to a first aspect of the present invention includes a programmable controller, a monitor device for monitoring a controlled object of the programmable controller, and a program creator for creating a program of the controlled object of the programmable controller. , A serial transmission means for transmitting and receiving data between the programmable controller, the monitor device, and the program maker by serial transmission is provided, and the programmable controller, the monitor device, and the program maker are instructed to communicate with each other. A communication command discriminating means for discriminating that there is any, and communication with any one of the programmable controller, the monitor device and the program creating machine based on the discrimination result of the communication command discriminating means. It is intended to be.

A programmable controller device according to a second aspect of the present invention comprises a programmable controller and a monitor device for monitoring a control target of the programmable controller, and operation determining means for determining whether the programmable controller operates the monitor device. The monitor device is operated according to a control command of the programmable controller according to the result of the operation determining means that the monitor device is operated.

A programmable controller device according to a third aspect of the present invention includes a programmable controller, a monitor device for monitoring a controlled object of the programmable controller, a program creator for creating a program of the controlled object of the programmable controller, and the programmable controller. A monitor device is provided with a monitor storage means for storing the monitor contents of the controlled object during communication, and displays the past monitor contents on the display unit of the program creator in response to a request to display the past monitor contents. Is.

[0015]

According to the first aspect of the present invention, the serial transmission means serially transmits the data communication between the programmable controller, the monitor device and the program maker, and the communication command determination means receives the communication command from either the monitor device or the program maker. It works to determine what is.

The operation discriminating means according to claim 2 discriminates that the monitor device is activated, and operates the monitor device according to the control command of the programmable controller.

The monitor storage means according to claim 3 stores the monitor content of the controlled object during communication of the monitor device,
It operates so as to display past monitor contents on the display unit of the program maker in response to a display request for past monitor contents.

[0018]

【Example】

Example 1. The present invention will be described based on the embodiments shown in the drawings. In FIG. 1, reference numeral 41 is a parallel / serial converter for converting parallel data of the monitor device 3 and the program creator 4 into serial data. In the figure, the same reference numerals as those used in the related art indicate the same or corresponding portions.

FIG. 2 is a flow chart showing a program for data transmission / reception between the PC 1 and the monitor device 3 or the program creator 4 which is a peripheral device, and FIG. 2A is a flowchart for specifying a communication target between the PC 1 and the peripheral device. ,
(B) is a flow chart showing data transmission / reception between the PC 1 and the monitor device 3, and (c) is a flow chart showing data transmission / reception between the PC 1 and the program creator 4. When the above flow chart is executed, the communication command determining means is executed.

Next, the operation will be described with reference to FIG. First, the data transmission / reception operation between the PC 1 and the program creator 4 will be described. Each flow chart is activated by initial processing after power is turned on, and is in the first processing state (steps 121, 131, 141). When the operator operates the touch panel 34 to create a program, the program creator 4 sends a request message for communication by a strobe signal, so that the PC 1 judges that there is a message (step 1
21), it is judged from the received message contents whether it is a request for communication with the monitor device 3 (step 122). If it is not a request for communication with the monitor device 3, then it is judged whether it is a request for communication with the program creator 4. If it is the communication request (step 124), the program creator 4 judges that it is a communication request with the PC 1 (step 142), and the RAM 31 of the program creator 4 is determined.
The received message is stored in a predetermined address of (step 14
3) The PC 1 and the program creator 4 communicate with each other (steps 125, 144). The next process is not executed until the predetermined address of the RAM 31 is cleared to 0 (steps 126 and 145). When the reception completion signal from the PC 1 is received, the reception message at the predetermined address in the RAM 31 is cleared to 0 and the processing state returns to the beginning (step 121,
131, 141). By such a series of operations, the operator creates a program from the program creator 4
1 sequence program can be created.

A data transmission / reception operation between the PC 1 and the monitor device 3 will be described. Each flow chart is activated by initial processing after power is turned on, and is in the first processing state (steps 121, 131, 141). When the operator performs an operation such as a monitor display on the touch panel 24, the monitor device 3 transmits a request message for communication by a strobe signal, so that the PC 1 judges that there is a message (step 122), and at the same time, the monitor device 3 Judges that there is a communication request with the PC1 if the data of the contents read the state of the PC1 and displayed on the CRT 23 (step 13).
2) The PC 1 and the monitor device 3 perform communication processing (steps 123 and 133), wait for a reception completion signal from the PC 1 (step 134), and generate a reception completion signal in the RAM.
The received message at the predetermined address 31 is cleared to 0 and the processing state returns to the beginning (steps 121, 131, 14).
1).

Example 2. The operation will be described with reference to FIG. The operation for controlling the PC 1 to display on the CRT 23 of the monitor device 3 in the same manner as the PC 1 executes the sequence program to control the controlled object such as the relay is called the monitor device operating mode. In FIG. 3, (a) is P
FIG. 6B is a flowchart showing the operation of C1, and FIG. When the above-mentioned flowchart is executed, the operation discriminating means is executed.

Each time the PC 1 executes the sequence program, it determines whether or not the monitor device operating mode is to be executed (step 201). If the monitor device operating mode is to be executed, a message indicating the mode is sent to the monitor device 3. (Step 202). The monitor device 3 has been activated by the initial process after the power is turned on and is in the first process state (step 301). When the monitor device 3 receives a message indicating the monitor device operating mode, processing such as displaying received data on the CRT 23 based on the message contents is performed (step 302), and when all the process contents are executed by the received message, it is sent to the PC 1. A completion signal is transmitted (step 303). P
C1 determines the presence or absence of the completion signal (step 203),
When the completion signal is received, the sequence program process is executed (step 204), and the process shifts to the process for judging whether the monitor device operation mode is executed again (step 20).
1).

Example 3. The function of the operator to read the data stored in the RAM 21 of the monitor device 3 by the program creator 4 to the program creator 4 is called a monitor history read request. This is because the current monitor contents are displayed on the CRT 23 of the monitor device 3, but it is sometimes desired to display the past monitor contents for inspection of the device. The operation will be described with reference to FIG. The program maker 4 and the monitor device 3 have been activated by the initial process since the power was turned on and are in the first processing state (steps 401 and 431).

First, a monitor history read request is judged (step 401), and if there is such a request, the program creator 4 sends a message indicating the monitor history read request to the monitor device 3 (step 402). When the monitor device 3 receives the message, the communication request with the program creator 4 is judged according to the content of the message (step 432), and if it is the monitor history read request, the data stored in the RAM 21 is used as the response message. Processing for transmitting to the program creator 4 is performed (step 433). As a result, the CRT 33 of the program creator 4 is added to the RAM 21 of the monitor device 3.
The data stored in is displayed (step 403), and when the display process is completed (steps 404 and 434), the process returns to the initial process again (steps 401 and 431).

[0026]

According to the PC device of the first aspect, the PC
There is an effect that it is possible to eliminate the need for operator switching work when data is exchanged between the monitor device and the peripheral device.

According to another aspect of the PC device of the present invention, another purpose is to make a storage element such as a ROM of the PC device store in advance position data relating to monitor display contents, a display image, and the like.
There is an effect that a monitor device can be controlled to easily change the display contents of the monitor.

According to the third aspect of the present invention, since the past monitor contents which are the control targets of the PC can be displayed on the CRT, the operator can easily confirm the past monitor contents. .

[Brief description of drawings]

FIG. 1 is a circuit diagram of a PC and peripheral devices according to the present invention.

FIG. 2 is a flowchart showing a communication operation between a PC and peripheral devices according to the present invention.

FIG. 3 is a flowchart showing a communication operation between a PC and a monitor device according to the present invention.

FIG. 4 is a flowchart showing the operations of the PC and the program creator according to the present invention.

FIG. 5 is a circuit diagram of a conventional PC and peripheral devices.

FIG. 6 is a flowchart showing a communication operation between a conventional PC and peripheral devices.

[Explanation of symbols]

 1 PC 3 Monitor device 4 Program generator 41 Parallel-serial converter

Claims (3)

[Claims] 1. A programmable controller, a monitor device for monitoring a control target of the programmable controller, a program creator for creating a program of the control target of the programmable controller, the programmable controller, the monitor device, and the program creator. A serial transmission means for transmitting and receiving data between the two by serial transmission, a communication command determination means for determining whether the programmable controller is the communication command of the monitor device or the program creator, and the communication command. A programmable controller device which communicates with the programmable controller, the monitor device, or the program maker based on the result of the determination by the determination means. 2. A programmable controller and a monitor device for monitoring an object to be controlled by the programmable controller, and operation determining means for determining whether the programmable controller operates the programmable controller. As a result, the programmable controller device which operates the monitor device according to the control command of the programmable controller by determining that the monitor device is operated. 3. A programmable controller, a monitor device for monitoring a control target of the programmable controller, a program creator for creating a program for the control target of the programmable controller, and a control target during communication between the programmable controller and the monitor device. And a monitor storage unit for storing the monitor contents of the above, and the past monitor contents are displayed on the display unit of the program creator in response to a display request for the past monitor contents.