JPH0410107A - Monitor method for sequence control - Google Patents

Abstract

PURPOSE:To output corresponding data to a transmission buffer with a data request command by successively storing parts of start and end addresses of ladder circuit constituting parts by a sequence controller. CONSTITUTION:Addresses of ladder circuit constituting parts in one picture are extracted from a display contents memory 22a and are stored in an address table 22b. A request area to a sequence controller 3 is obtained from a ladder circuit constituting parts classified table 22c based on a stored request address. This request area is stored in a transmission buffer 22d, and an address register command is transmitted from an input/output port 23 to an input/output port 32 of the sequence controller 3 through a communication cable 4. The controller 3 successively stores corresponding addresses of ladder circuit constituting parts in an address register table 31a.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sequence control monitoring method for monitoring the operating status of a sequence-controlled machine while viewing a ladder circuit drawn on a display of a monitor device.

Conventional technology Automobile manufacturing lines use industrial robots with sequence control functions, and for some reason during the line operation, industrial robots may move slightly abnormally. In such cases, the operator must monitor the operating status of the ladder circuit components, such as turning on/off contacts, energizing/de-energizing the coil, timer values, counter values, etc.
While the line is running, operate the dynamic switch on the operation panel to dynamically display the ladder circuit on the display of the monitor device to monitor whether the movement of the industrial robot matches the movement of the ladder circuit components. .

Problems to be Solved by the Invention In the sequence control monitoring method described above, when the monitor device requests data from the sequence control device, it transmits the start address and end address of the area requiring data to the sequence control device; Data in the above area is received from the sequence control device and the ladder circuit is dynamically displayed on the display based on the received data, so it is suitable if the addresses are consecutive, but if the addresses are discontinuous or , When requesting a large number of these discontinuous addresses, communication between the monitor device and the no-quench control device is required for the number of areas consisting of continuous addresses, resulting in an inconvenience that the communication time becomes longer. . There are limits to increasing this processing speed due to the hardware aspects of the sequence control device and the monitor device.

Means for Solving the Problems Therefore, in the present invention, a sequence control device receives an address registration command from a monitor device by operating a dynamic switch, and registers the ladder circuit components displayed on the display of the monitor device. After storing the pair of start address and end address in the address registration table until receiving the end code from the monitor device, the data request command from the monitor device is received and the start address stored in the address registration table is stored. The data in the data area that corresponds to the start address and end address of the data stored in the operation table for each ladder circuit component is sequentially stored in the transmission buffer while referring to the pairs of the data area and the end address, and the data in the data area is Once all of the data is stored in the transmission buffer, the contents of the transmission buffer are transmitted all at once to the monitor device, and the ladder circuit is dynamically displayed on the display.

The operation sequence control device sequentially stores pairs of start addresses and end addresses of ladder circuit components in an address registration table using an address registration command, and stores data corresponding to the start address and end address using a subsequent data request command. All of the data in the area is stored in a transmission buffer, and when this storage is completed, all the stored contents of the transmission buffer are transmitted at once to the monitor device.

Embodiment FIG. 1 shows a system used in an embodiment of the present invention. In the figure, reference numeral 1 denotes an operation panel that includes a mode switch 10, a static switch 11, a dynamic switch 12, and a stop switch 13. 2 is a monitor device, which includes a display 20 and a CPU.
21, a memory 22, and an input/output port 23.

The memory 22 is divided into a display content memory 22a, a request address table 22b, a controller side table 22c for each ladder circuit component, a transmission buffer 22d, and a reception buffer 22e.

3 is a sequence control device, which includes a CPU 30;
, a memory 31 , and a human output port 32 . The memory 3I includes an address registration table 3Ia, a sequence data memory 31b, and an operation table 3 for each ladder circuit component.
1c, a transmission buffer 3Id, and a reception buffer 31e.

Here, the operation of the above system will be explained with reference to the flowchart of FIG. 2.3 and the action diagram of FIG. 4.

When the operator operates the mode switch 10 on the operation panel 1 to switch the display 20 of the monitor device 2 from the static mode to the dynamic mode, and then operates the dynamic switch 12, the second Monitor device 2 in step 5too in the figure.
The process begins, and in step 5101 the display 20
The addresses of the ladder circuit components in one screen displayed in the screen are extracted from the display content memory 22a and stored in the request address table 22b, and step 51
Based on the request address stored in the request address table 22b in step 02, the sequence control device 3 is
The request area is stored in the transmission buffer 22d, and an address registration command is sent from the human output port 23 to the human output port 32 of the sequence control device 3 via the communication cable 4.

Then, in the sequence control device 3, the CPU
30, the address registration command is received from the monitor device 2 in step 5200 of FIG. The information is sequentially stored in the address registration table 31a.

This storage operation in the address registration table 31a is performed continuously until the end code is received from the monitor device 2, and ends at step 5202. On the other hand, the monitor device 2 transmits a data request command to the sequence control device 3 in step 5I03 of FIG. 2 with a required time delay after outputting the end code. When the sequence control device 3 receives the data request command from the monitor device 2, the processing of the sequence control device 3 starts at step 5300 in FIG. The transmission buffer 31d transmits data in the data area corresponding to the start address and end address of the data stored in the ladder circuit component operation table 31c while referring to the set of start address and end address stored in the table 31a. When all the data in the data area corresponding to the start address and the end address is stored in the transmission buffer 31d, in step 5302, the sequence control device 3 collectively stores the stored contents of the transmission buffer 31d in the communication cable. 4
The data is transmitted from the input/output port 32 to the human output port 23 of the monitor device 2 via the input/output port 32, and ends at step 5303.

Then, in the monitor device 2 that has received the storage contents of the transmission buffer 31d, the second
At step 5104 in the figure, all the data in the data area from the transmission buffer 31d of the sequence control device 3 is stored in the reception buffer 22e, and the stored contents of the reception buffer 22e are stored in the sequence control device side table 22c for each ladder circuit component. The address and the operation data of the ladder circuit component are stored in association with each other, and in step 5105, the sequence controller side table 22 for each ladder circuit component is stored from the address of the ladder circuit component displayed on the display 20.
For example, if the timing is such that a contact is turned on or a coil is excited, the contact or coil is displayed in reverse video on the display 20 as indicated by hatching in Fig. 2, and the timer, counter, etc. Then, the ladder circuit is dynamically displayed on the display 20, such as displaying the current value. Then, in step 5106, it is determined whether or not the stop switch 13 on the operation panel 1 is operated by the operator. If the stop switch 13 is not operated, the process returns to step 5104, continues dynamic display of the ladder circuit on the display 20, and displays the stop switch 13. 13, the dynamic display of the ladder circuit on the display 2o ends in step 5107.

Effects of the Invention As described above, according to the present invention, pairs of start addresses and end addresses of ladder circuit components are sequentially stored in an address registration table by a sequence control device or an address registration command, and then a data request command is issued. All the data in the data area corresponding to the start address and end address are stored in the transmission buffer, and when this storage is completed, all the data stored in the transmission buffer is sent to the monitor device at once.
From the hardware perspective of the sequence control device, it is only necessary to separate the address registration table and the transmission buffer in its memory, and of course it can handle the problems when the addresses of the ladder circuit components in one screen displayed on the display are continuous. Even in the case of discontinuity, the communication time between the sequence control device and the monitor device can be significantly shortened.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a system used in an embodiment of the present invention, FIG. 2 is a flowchart of a monitor device in the same embodiment, FIG. 3 is a flowchart of a sequence control device in the same embodiment, and FIG. 4 is a flowchart of a sequence control device in the same embodiment. It is an explanatory diagram of the operation of the same embodiment. 2... Monitor device, 3... Sequence control device, 12... Dynamic switch, 31a...
Address registration table, 31c... Operation table for each ladder circuit component. Figure 2 Display screen (request address storage table) φ...No, 1...Dynamic display screen of the display

Claims (1)

[Claims] (1) The sequence control device receives an address registration command from the monitor device by operating a dynamic switch, and sends the set of start address and end address of the ladder circuit component displayed on the display of the monitor device to the monitor device. After storing it in the address registration table until it receives the end code from the address registration table, it receives a data request command from the monitor device and executes the ladder circuit while referring to the set of start address and end address stored in the address registration table. The data in the data area corresponding to the start address and end address of the data stored in the component-specific operation table is sequentially stored in the transmission buffer, and when all the data in the data area is stored in the transmission buffer, the transmission buffer is A sequence control monitoring method characterized in that the stored contents of are sent to a monitor device all at once, and a ladder circuit is dynamically displayed on a display.