JP2526704B2 - Programmable controller monitor control method and monitor control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor control method and a monitor control device for a programmable controller that monitors the execution state of a programmable controller that executes a sequence program based on the SFC language.

[Conventional technology]

Recently, a sequence program (hereinafter referred to as S
A method of loading an FC program) to a programmable controller and executing it, and monitoring the execution state by a monitor device has been put into practical use.

The above-mentioned input device and monitor device are usually integrally formed as a peripheral device and connected to a programmable controller via a communication interface.

 FIG. 4 shows an example of the SFC program.

The SFC program is a flow format representation of the flow of control, and is a "step" that indicates a certain cohesive operation.
And a transition indicating a condition for moving to the next step when the step is in the execution state, for example,
It consists of a combination with "migration". A step in the execution state is called an "active step", and it becomes inactive when the transition condition associated therewith is satisfied, and the next subsequent step becomes the execution state.

In FIG. 4, 401 indicates a “step”, and 402 indicates a “shift” of the step. Also, even in the same step,
400 is called an initial step and 403 is called an end step. The block from the initial step to the end step is called one block.

For example, by creating a plurality of this block and activating each block, the plurality of blocks are executed in parallel. The activated block is called an "active block", and this block is the active block until the execution from the initial step of this block to the end step of this block is completed.

Further, for example, the monitor device is brought into a state in which the SFC program shown in FIG. The execution status of the SFC program can be monitored by reversing the display of (representation display).

FIG. 5 is a block diagram showing the configuration of a conventional programmable controller. In the figure, 501 is a CPU that executes various arithmetic processes, 506 is a system program ROM that stores a system program executed by the CPU 501, 507 is an active block table described later, RAM that stores an active step table, and 504 is a programmable controller ( (Not shown) is an input / output interface for matching the signal on the cable with the internal signal, 505 is a CRT display interface, and 505a is a CRT.

FIG. 6 is a diagram showing an active block table and an active step table stored in the RAM 507 shown in FIG. In the figure, 510 is an active block table indicating whether each block is active or inactive. For each block No. (block number), the block is either active / inactive. It has information indicating whether there is any. Reference numeral 511 is an active step table in which the step number (step number) of the active step for each block is stored.

Further, in FIG. 5, reference numeral 521 denotes an active step reverse display program for detecting the active step No. from the active step table 511 and performing a process of displaying the step in reverse video.
This active step inversion program is a system program
It is stored in ROM506.

Next, the monitor operation will be described with reference to FIG. Seventh
The figure shows a flow chart when the active steps in the SFC program are displayed on the monitor on the SFC diagram shown in FIG. 4, for example. After the SFC diagram of the block you want to monitor is displayed on the screen, when you start the monitor mode that monitors the active step in the SFC program, the monitor device reads the block number of the block that is already displayed (step S1), and then The active step number for this block is detected from the active step table 511 of FIG. 6 by the active step reverse display means 521, and the step of the detected step number is highlighted (step S2). After that, it is determined whether or not to continue the monitor mode (step S3). When it is determined that the monitor mode is to be continued, the process returns to step S2, and steps S2 and S3 are performed until it is determined that the monitor mode is not continued. Execute repeatedly. When it is determined in step S3 that the monitor mode is not continued, a series of monitor mode processing operations ends.

[Problems to be Solved by the Invention]

Since the conventional programmable controller monitor device is configured as described above, when the SFC program is composed of multiple blocks, the block to be displayed is specified, the SFC diagram of that block is displayed, and then the monitor display is performed. , When an active block, that is, an active block is to be monitored, in order to determine whether or not the block is an active block, the monitor is executed for each block to investigate, or a block list list (active It is necessary to monitor the block table) and specify the active block to monitor the active block. For example, an extra operation is required for the active block monitor display. There was a problem that could not be monitored.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a monitor control method and a monitor control device of a programmable controller capable of performing quick monitor display of active blocks.

[Means for solving the problem]

A monitor control method for a programmable controller according to the present invention is provided with a sequence program composed of a plurality of blocks, and each block is activated individually to selectively activate the block for each block. In the monitor control method of the programmable controller that sequentially executes the steps of blocks, the presence / absence of automatic monitor designation is set in advance for each block, the information is stored in the active block monitor designation table, and the block The activation is monitored, and it is determined whether or not the activated block receives the automatic monitor designation by referring to the active block monitor designation table. If the activated block receives the automatic monitor designation, the Automatically switch block to block Performs processing to differentiate display the active steps of the block.

Further, the programmable controller monitor control device according to the present invention is provided with a sequence program composed of a plurality of blocks, and activates each block individually to selectively activate the block for each block. In a monitor controller of a programmable controller that sequentially executes steps of blocks in an active state, an active block monitor designation table indicating whether or not automatic monitoring is designated for each block, and block activation detection means for detecting activation of a block For each block, an active block table that indicates whether the block is active or inactive, an active step table that stores the step number of the active step by step execution, and whether or not the active block is designated for automatic monitoring are displayed. The active block monitor finger An active block monitor designation detecting means for switching the block to be monitored by detecting from the table, and an active step number of the block designated by the automatic monitor detected by the active block monitor designation detecting means is detected from the active step table, Active step discrimination display means for performing processing for differentially displaying the step of the active step number.

[Operation] In the monitor control method of the programmable controller according to the present invention, the setting information of the presence / absence of automatic monitor designation for each block is stored in advance in the active block monitor designation table for each block, and when the sequence program is executed, The activation of the block is monitored, and when the block is activated, it is determined whether or not the block has received the automatic monitor designation by referring to the active block monitor designation table. Block to be monitored is automatically switched,
The process of differentially displaying the active step of the block (block being monitored) is automatically performed.

In the monitor controller of the programmable controller according to the present invention, the block activation detecting means detects that the block is activated, that is, the activation of the block is detected, and information on whether the block is active or inactive is provided for each block. It is stored in the active block table.

The presence / absence of automatic monitor designation is preset for each block, and the information is stored in the active block monitor designation table, and the active block monitor designation detection means determines whether the active block is designated for automatic monitor or not. When the active block is detected from the designated table and the active block is designated to be automatically monitored, the active block monitor designation detecting means switches the block to be monitored to the active block.

The step number of the active step by executing the step is stored in the active step table, and the active step discrimination display means detects the active step number of the block designated by the automatic monitor from the active step table and differentially displays the step of this active step number. Perform processing.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a programmable controller including a monitor controller according to the present invention.

In the figure, 101 is a CPU that executes various calculations, and 102 is a CPU.
A system program ROM in which the system program executed by 101 is stored, 103 is a RAM in which an active block table, an active step table, etc. are stored, 104 is a signal on a cable to and from a programmable controller (not shown), and an internal signal I / O interface to match with, 10
Reference numeral 5 is a CRT display interface, and 105a is a CRT.

FIG. 2 is a diagram showing an active block table, an active step table, and an active block monitor table stored in the OS work RAM 103 shown in FIG.

In the figure, 110 is an active block table indicating whether the block is active or inactive for each block, and for each block No., information indicating whether the block is active or inactive is displayed. Have

Reference numeral 111 is an active step table in which step numbers of active steps are stored for each block.

Reference numeral 112 denotes an active block monitor designation table that stores the presence / absence of automatic monitor designation for each block.

Further, in FIG. 1, reference numeral 121 denotes an active step reverse display program, which detects the active step from the active step table 111 and reverse-displays the step on the screen.
Is implemented by executing.

122 is a block activation detection program that detects activation of a block, in other words, that the block changes from inactive to active by referring to the active block table 110, and an active block detection unit that detects an active block is , CPU 101 is implemented by executing this block activation detection program.

123 is the active block monitor specification table indicating whether the block that has changed from inactive to active is automatically monitored.
This is an active block monitor designation detection program detected by 112. If it is designated, the block to be monitored is switched to that block. The active block monitor designation detection means is implemented by the CPU 101 executing the active block monitor designation detection program 123.

Note that these active step reverse display programs 12
1, block activation detection program 122, active block monitor detection program are all system program ROM 102
It is stored in.

Next, the operation will be described with reference to the flowchart of FIG.

In FIG. 1, the CPU 101 is a system program ROM 102.
It operates according to the program stored in the CRT1 and detects the necessary data while monitoring each table stored in the RAM103, and the CRT1
Display on 05a.

The user, for example, displays the SFC diagram on the monitor screen in advance, and then specifies the block to be automatically displayed on the monitor by key operation, whereby the block is specified as the automatic monitor block.

In the flowchart of FIG. 3, the monitor device reads the block number whose SFC diagram is already displayed on the screen (step S10), and the active step reverse display program 1
At 21, the active step of this block is obtained from the active step table 111 shown in FIG. 2, and this active step is highlighted on the screen (step S11).

In addition, the active block table 110 shown in FIG.
122 monitors and detects activated blocks, in other words, blocks that have changed from inactive to active (step
S12).

Further, the active block monitor specification detection program 123 detects whether or not the activated block is a block previously specified as an automatic monitor block by the user by the active block monitor specification table 112 shown in FIG. If so, the program is switched to monitor this program (step S13).

Finally, it is determined whether or not to continue the monitor mode (step S14). If the monitor mode is to be continued, the process returns to step S11 and the processes from step S11 to step S13 are repeated. By the above operation, when the block designated as the automatic monitor block is activated, the monitor screen can be automatically switched so that this block is displayed on the screen. If it is determined in step S14 that the monitor mode is not continued, the operation ends.

In the above-mentioned embodiment, the automatic monitor designation of the block is explained, but it is also possible to display the ladder circuit showing the operation of the step on the screen and monitor the operating state thereof. That is, the active step monitor designation table is provided by the same method as that of the above-described embodiment, and the activation detection means for the step is provided, so that the designated step can be automatically monitored.

Further, by coexisting the active block monitor specification table and the active step monitor specification table, it is possible to automatically monitor the specified step of the specified block.

In addition, in the above-mentioned embodiment, the automatic monitor system is adopted so that the monitor screen of the active block can be quickly moved. However, in the conventional method, the active block information can be monitored on the monitor screen of the block. Thus, it is possible to easily switch the monitor screen to the designated active block.

〔The invention's effect〕

As described above, according to the present invention, the active block monitor designation table is newly provided for monitor display, the user is made to designate the block to be automatically displayed on the monitor in advance, and when the designated block is activated, the monitor screen of the block is displayed. The active step is displayed automatically so that it can be distinguished from other steps by reverse display, etc., so that the block can be automatically monitored at the time of startup, and a quick monitor display of the active block can be realized. .

[Brief description of drawings]

1 is a block diagram showing the configuration of a monitor controller of a programmable controller according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the contents of the RAM 103 shown in FIG. 1, and FIG.
FIG. 4 is a flow chart showing the processing in the monitor mode in the monitor control method according to the present invention, FIG. 4 is an explanatory view showing an example of the SFC program, and FIG. 5 is a block diagram showing the configuration of a conventional programmable controller monitor device.
FIG. 6 is an explanatory diagram showing the contents of the RAM 507 shown in FIG. 1, and FIG. 7 is a flowchart showing the operation of the conventional monitor device. In the figure, 101 ... CPU 102 ... system program ROM 103 ... RAM 110 ... active block table 111 ... active step table 112 ... active block monitor specification table 121 ... active step reverse display program 122 ... block activation Detection program 123 ... Active block monitor designation detection program In each figure, the same reference numerals indicate the same or corresponding portions.

Claims (2)

(57) [Claims] 1. A sequence program composed of a plurality of blocks is provided, and each block is individually activated to selectively activate the block, and the steps of the active block are sequentially executed. In the programmable controller monitor control method, the presence / absence of automatic monitor designation is set in advance for each block, the information is stored in the active block monitor designation table, and the activation of the block is monitored under the execution of the sequence program and activated. Whether the specified block has received the automatic monitor specification is determined by referring to the active block monitor specification table. If the activated block has received the automatic monitor specification, the block to be monitored is automatically changed to that block. Switch to, and perform a process to distinguish the active step of the block. A monitor control method for a programmable controller, which is characterized by performing. 2. A sequence program composed of a plurality of blocks is provided, each block is activated individually to selectively activate the block, and the steps of the active block are sequentially executed. In a monitor controller of a programmable controller, an active block monitor specification table indicating whether or not automatic monitoring is specified for each block, block activation detection means for detecting activation of a block, and block activation for each block Alternatively, the active block table indicating whether the block is inactive, the active step table storing the step number of the active step by step execution, and whether or not the active block is automatically monitored are detected from the active block monitor specification table. , Switching blocks to be monitored Active block monitor designation detecting means for performing the step of detecting the active step number of the block designated by the automatic monitor detected by the active block monitor designation detecting means from the active step table, and differentially displaying the step of the active step number. A monitor controller for a programmable controller, characterized in that it has an active step discrimination display means for performing.