JPH0736372A - Operation display device for programmable controller - Google Patents

Abstract

PURPOSE:To eliminate the dispersion of the time from the operation of a switch to the transmission of a control command, and control a programmable controller without delay from the operation of the switch. CONSTITUTION:A data is transmitted and received with a programmable controller by communication, the operating state of the programmable controller is displayed on an indicator 4, and the operation of the programmable controller is controlled in reply to the operation of a switch 5. A first interface 6 transmits the read command of the operating state, and receives the returned data. A second interface 7 transmits the control command according to the operation of the switch 5. When the switch 5 is operated, the second interface 7 is selected prior to the first interface 6 by a transmission switching part 8, and the control command is immediately transmitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation display device for a programmable controller capable of giving and receiving data to and from the programmable controller by communication to display the operating state of the programmable controller and to give control instructions to the programmable controller. It is about.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, an operation display device 3 is provided which is connected to a communication interface (upper link unit) 1a provided in a programmable controller 1 via a transmission line 2. Operation display device 3
Is equipped with a display 4 and a switch 5, transmits and receives data with the programmable controller 1 by communication, displays the operating state of the programmable controller 1 on the display 4, and operates the switch 5 as necessary. Programmable controller 1
To control the operation of the programmable controller 1.

That is, as shown in FIG. 3A, a period P ₁ during which a command is transmitted from the operation display device 3 to the programmable controller 1 and a command from the operation display device 3 as shown in FIG. 3B. Period P for returning data from the programmable controller 1 to the operation display device 3 in response to
By alternately setting ₂ and 3, data is transmitted and received between the operation display device 3 and the programmable controller 1. The command transmitted from the operation display device 3 to the programmable controller 1 includes a read command for reading the operating state of the programmable controller 1 and a control command for positioning the equipment in correspondence with the operation of the switch 5. Therefore, as shown in FIG. 4, the period P ₁₁ for transmitting the read command and the period P ₁₂ for transmitting the control command are set alternately.

[0004]

In the above configuration, since the control command corresponding to the operation of the switch 5 is transmitted to the programmable controller 1 in the period P ₁₂ , the operation of the switch 5 depends on the timing of operating the switch 5. Control command from programmable controller 1
There will be variations in the time until it is transmitted to. That is, when the switch 5 is operated at the time t ₁ of the period P ₁₁ during which the read command is transmitted, the time required to complete the transmission of the control command becomes T ₁ , and the data is returned in response to the read command. time t ₂ of the period P _2, which is
When the switch 5 is operated at time T _2, it becomes time T ₂ , and when the switch 5 is operated at time t ₃ immediately before the period P ₁₂ for transmitting the control command, time T ₃ becomes, and T ₁ > T ₂ > T ₃ , so time T ₁
So that the variation in the through T _3.

If the time from the operation of the switch 5 to the transmission of the control command varies as described above, the time from the operation of the switch 5 to the response of the equipment varies, which causes a problem that the operation feeling is bad. In particular, when the time from the operation of the switch 5 to the response of the equipment becomes long, when the equipment is positioned by operating the switch 5, it is not possible to make a quick response, and there arises a problem that the positioning timing is shifted.

An object of the present invention is to solve the above problems and to eliminate the variation in the time from the operation of the switch to the sending of the control command, and to shorten this time without delay from the operation of the switch. It is intended to provide an operation display device for a programmable controller capable of controlling the.

[0007]

In order to achieve the above object, the present invention is directed to a programmable controller connected to a communication interface provided in the programmable controller and returned in response to a read command transmitted to the programmable controller. In an operation display device that displays the operation state on a display and gives a control command corresponding to the operation of a switch to the programmable controller to control the operation of the programmable controller, the read command is transmitted to the programmable controller and the programmable controller is operated from the programmable controller. And a first interface for transmitting and receiving data, a second interface for transmission only for transmitting a control command corresponding to the operation of the switch to the programmable controller, and a first interface for operating the switch. And a sending switching unit for actuating the second interface in preference to face.

[0008]

According to the above structure, the second interface dedicated to transmitting the control command in response to the operation of the switch is provided, and the second interface is prioritized over the first interface by the transmission switching unit when the switch is operated. Since the interface of the second is operated, if the switch is operated, the second
The control command can be transmitted to the programmable controller through the interface. Moreover,
By transmitting the control command with priority over the first interface when operating the switch, the control command can be transmitted preferentially regardless of the data exchanged with the programmable controller. There is no difference in the time from the transmission of the control command to the transmission of the control command. Since the operation of the first interface is forcibly stopped and the second interface is operated when the switch is operated, the read command is being transmitted or the data of the operating state corresponding to the read command is being received. If so, the read command and operation status data will be lost, but since this information does not affect the operation of the programmable controller, it only delays the change in the information displayed on the display. Then, when the read command is transmitted next time, accurate information can be displayed on the display.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a display device 4 such as a liquid crystal display device, a switch 5 such as a switch matrix having a plurality of operating parts, and a programmable controller 1 are provided.
(See FIG. 2) A first interface 6 for transmission / reception of specifications such as RS-232C connected to the controller 2 and a control command corresponding to the operation of the switch 5 are provided to the programmable controller 1.
And a second interface 7 dedicated to transmission. Further, the first interface 6 and the second interface 7 are selectively selected by the transmission switching unit 8 so that the operation of only one of them becomes effective. The display unit 4, the switch 5, and the transmission switching unit 8 are connected to a control unit 9 using a microprocessor. The control unit 9 decodes the received data to create display data for the display unit 4, and the programmable controller 1 A read command to be transmitted is created, or a control command corresponding to the operation of the switch 5 is created. Further, the control unit 9 controls the transmission switching unit 8 to determine which of the first interface 6 and the second interface 7 is to be activated effectively. A memory 10 is connected to the control unit 9, and information received from the programmable controller 1 is stored in the memory 10, and a table for converting received data into display data, a switch 5 and a control command. Stores a table related to the relationship with. Both the first interface 6 and the second interface 7 are connected to the transmission line 2 (see FIG. 2).

Next, the operation will be described. When the switch 5 is not operated, the control unit 9 creates a read command, transmits the read command to the programmable controller 1 through the first interface 6 regularly or irregularly, and programmable in response to the read command. Data regarding the operating state of the controller 1 is received. Also, the received data is decoded and displayed on the display 4. On the other hand, when the switch 5 is operated, the control unit 9 immediately switches the transmission switching unit 8 and sets the second interface 7 to the control unit 9.
To the second control command corresponding to the operation of the switch 5.
Is transmitted to the programmable controller 1 through the interface 7. That is, the control command is preferentially transmitted regardless of the operating state of the first interface 6. After transmitting the control command, the transmission switching unit 8 returns to the state in which the first interface 6 is selected, and the data returned from the programmable controller 1 in response to the control command is received via the first interface 6. Will be. With the above operation, when the equipment is positioned by operating the switch 5, the switch 5
Since the equipment can be controlled without delay from the operation of, there is no variation in the time from the operation of the switch 5 to the operation of the equipment, and there is no time delay.

[0011]

As described above, according to the present invention, the second interface dedicated to transmitting the control command in response to the operation of the switch is provided, and the transmission switching unit gives priority to the first interface when the switch is operated. Then, the second interface is operated, so that the control command can be transmitted to the programmable controller through the second interface without delay by operating the switch. Moreover, by transmitting the control command with priority over the first interface when the switch is operated,
The control command can be preferentially transmitted regardless of the data exchanged with the programmable controller, and there is no difference in the time from the operation of the switch to the transmission of the control command.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment.

FIG. 2 is a diagram showing a connection relationship between an operation display device and a programmable controller.

FIG. 3 is an operation explanatory diagram of a conventional example.

FIG. 4 is an operation explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Programmable Controller 2 Transmission Line 3 Operation Display Device 4 Display 5 Switch 6 First Interface 7 Second Interface 8 Transmission Switching Unit 9 Control Unit 10 Memory

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Nishino 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] 1. An operating state of a programmable controller, which is connected to a communication interface provided in the programmable controller and is returned in response to a read command transmitted to the programmable controller, is displayed on a display, and a switch is made to the programmable controller. In the operation display device for giving a control command corresponding to the operation of 1 to control the operation of the programmable controller, a first interface for transmission / reception for transmitting a read command to the programmable controller and receiving data from the programmable controller, and a switch A second interface dedicated to transmission for transmitting a control command corresponding to the operation to the programmable controller, and a second interface for activating the second interface over the first interface when the switch is operated. An operation display device for a programmable controller, comprising: a signal switching unit.