JPH05158836A - Programming device for programmable controller - Google Patents

Abstract

PURPOSE:To eliminate instructing operation about communication specification. CONSTITUTION:Information is transmitted to a programmable controller by changing the communication specification by a first communication control means 1000, and when a judging means 1100 confirms the answer of the programmable controller, the communication specification corresponding to this answer is set as the communication specification for usual communication by a second communication control means 1200.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller programming device for exchanging information with a programmable controller.

[0002]

2. Description of the Related Art As shown in FIG.
00 is connected to the programmable controller 200 by a transmission line 150. Programming device 100
The operator inputs a sequence program in sequence command units from the keyboard 60 to create the entire sequence program on the display screen.

The created sequence program is transmitted via the transmission line 150 to the programmable controller 200.
Then, the programmable controller 200 executes the sequence program to control the operation of the electronic device connected to the programmable controller 200.

The programming device 100 can monitor the operation state of the electronic device by receiving the operation information of the electronic device from the programmable controller 200 and displaying it on the display device 50.

The programming device 100 can be attached to and detached from the programmable controller 200, and can be exchangeably connected to a plurality of types of programmable controllers 200.

In order to communicate with various programmable controllers having different communication specifications, the user inputs a transmission state (transmission speed and parity, data length, data format such as stop bit) from the keyboard 60 in advance prior to the communication. ..

[0007]

Therefore, the user has to check the communication specifications of the programmable controller, and if an erroneous input is made, communication between the programming device and the programmable controller cannot be performed.

Therefore, in view of the above points, an object of the present invention is to automatically detect the communication specifications of the programmable controller of the connection destination without the operator's instruction of the communication specifications, and use the detected communication specifications. It is to provide a programmable controller programming device capable of communicating.

[0009]

In order to achieve such an object, the present invention selects one of a plurality of communication specifications and communicates with a programmable controller according to the selected communication specification. In a programmable controller programming device, first communication control means for sequentially transmitting information to the programmable controller according to each of the plurality of communication specifications, and determination means for determining whether or not there is a response from the programmable controller to the information. When the control information indicating the used communication specification is input from the first communication control means and the result of the judgment by the judgment means is that there is a response, the communication specification corresponding to the response is sent to the programmable controller. Second communication control means set as communication specifications used for communication of .

[0010]

In the present invention, attention is paid to the fact that communication cannot be established unless the communication specifications of the transmitting side and the receiving side match, and the communication specifications are sequentially switched to transmit the same information to the programmable controller, and the programmable controller sends a response. When there is, the communication specification corresponding to the response communication is determined to be the communication specification on the programmable controller side.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows the basic construction of an embodiment of the present invention.

The programming device of the present embodiment is a programming device for a programmable controller that selects one of a plurality of communication specifications and communicates with the programmable controller according to the selected communication specifications.

In FIG. 1, reference numeral 1000 denotes a first communication control means for sequentially transmitting information to the programmable controller according to each of the plurality of communication specifications.

Reference numeral 1100 is a judging means for judging whether or not there is a response from the programmable controller to the information.

Reference numeral 1200 denotes control information indicating the used communication specifications from the first communication control means, and when the result of the judgment by the judgment means is that there is a response, the communication specification corresponding to the presence of the response is described as above. It is a second communication control unit that is set as a communication specification used for communication with the programmable controller.

FIG. 2 shows a concrete circuit configuration of the embodiment of the present invention.

The same parts as those in the conventional example shown in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 2, the CPU 10 executes a sequence program creation process, a monitor process, and a communication control process according to various programs stored in the system program memory 20. The work memory 30 is the CPU 10
The data used for the arithmetic processing of is temporarily stored.

The interface 40 exchanges information with the programmable controller according to the communication specifications, that is, the transmission speed and the data format instructed by the CPU 10. The user programmable memory 70 stores the created sequence program. The timer 80 is started by the CPU 10 and measures a predetermined time.

Initial processing of communication executed in such a circuit will be described with reference to FIG.

The control procedure shown in FIG. 3 is a control procedure executed by the CPU 10 in FIG. 2, and this control procedure is actually a CP.
It is written in the executable program language of U10 and is stored in the system memory 20. The CPU 10 sequentially reads and executes this control procedure to execute automatic detection of communication specifications according to the present invention.

Further, a plurality of types of communication specifications corresponding to the model of the programmable controller are defined in this control procedure.

In FIG. 3, the CPU 10 sets the communication-related information indicating the first communication specification in the work memory 30, and then sets the timer 80 (S10 → S30).

Next, according to the communication related information set and stored in the work memory 30, a response request command is transmitted from the interface 40 to the programmable controller according to the first communication specification (S30). CPU at this time
10 operates as the first communication control means of the present invention.

Thereafter, the CPU 10 waits for the response information to be transmitted from the programmable controller, and when the response information is received, the CPU 10 stores the response information in the work memory 30.
(S40).

Upon receiving the time-up signal from the timer 80, the CPU 10 sends the response information to the work memory 30.
It is determined that there is a response from the programmable controller by checking whether or not it is stored in (S50 →
S60). At this time, the CPU 10 operates as the determination means of the present invention.

When a determination result of no response is obtained in the determination processing of S60, the CPU 10 serves as the first communication control means of the present invention, and then the communication-related information regarding the second communication specifications is stored in the work memory. Switch to 30 (S7)
0).

Thereafter, the execution procedure is returned to S20, and the same processing as described above in the second communication specification, that is, the timer setting,
Transmission of response request, determination of presence / absence of response after a fixed time (S20
~ S60) is performed.

As described above, when the communication specifications are sequentially switched and the response request signal is transmitted, the programmable controller transmits the response request when the communication specifications are met.

In this case, the CPU 10 obtains a response presence determination process in the determination process of S60. Therefore,
The CPU 10 stops the response request transmission process and ends the present control procedure. At this time, the CPU 10 operates as the second communication control means of the present invention. Further, at this time, the communication-related information having the communication specifications that match the programmable controller to be connected is set and stored in the work memory 30. Therefore, thereafter, the CPU 10 uses this communication related information for the communication processing to be executed.

Since the CPU 10 executes the above communication control processing to automatically identify the communication specifications of the programmable controller at the connection destination, the user does not need to instruct the communication specifications of the programmable controller.

In addition to this embodiment, the following examples can be given.

1) In this embodiment, the response request command is used as the information used when detecting the communication specifications, but the information is not limited to this as long as it is the information which the programmable controller responds in addition to the response request command.

2) In the present embodiment, an example in which the CPU 10 executes the communication control processing relating to the present invention has been shown. However, in a programming device for performing communication using a dedicated communication unit, a circuit according to the basic configuration of FIG. May be provided in the communication unit.

3) S20 to S in the control procedure of FIG.
When the loop process of 70 is repeatedly executed and the information communication is completed with all the communication specifications stored in the program in advance, there is no communication specification that matches the programmable controller. In such a case, a message may be displayed on the display device 50 to inform the operator of the content of the communication error.

[0037]

As described above, according to the present invention, the user does not need to instruct and input the communication specifications on the programmable controller side, and erroneous input operations do not occur.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific circuit configuration of an embodiment of the present invention.

3 is a flowchart showing a control procedure executed by a CPU 10 in FIG.

FIG. 4 is a perspective view showing a conventional system configuration.

[Explanation of symbols]

 10 CPU 20 System Memory 30 Work Memory 40 Interface 50 Display Device 60 Keyboard 80 Timer

Claims (1)

[Claims] 1. A programming device for a programmable controller, which selects one of a plurality of communication specifications and communicates with a programmable controller according to the selected communication specifications, wherein information is sequentially transferred in accordance with each of the plurality of communication specifications. First communication control means for transmitting to the programmable controller, determination means for determining whether or not there is a response from the programmable controller to the information, and control information indicating communication specifications used from the first communication control means. And a second communication control means for setting a communication specification corresponding to the presence of the response as a communication specification used for communication with the programmable controller when the result of the determination made by the determination means is a response. A programmable controller programming device characterized by the above.