JP3227274B2 - Link processing method of programmable controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a link processing method for a programmable controller.

[0002]

2. Description of the Related Art When a link is established between a programmable controller and a computer, a link unit is used, and data is exchanged between the computer and the CPU unit of the programmable controller through the link unit. The transmission and reception of data between the link unit and the CPU unit has conventionally been performed as follows. That is, in the receiving process, when receiving the notification of the completion of the reception from the link unit, the CPU unit collectively transfers and copies all the reception data stored in the buffer of the link unit to the memory in the CPU unit. Also, in the transmission process, when the transmission permission is received from the link unit, the CPU unit collectively transfers and copies all transmission data stored in the memory in the CPU unit to the buffer of the link unit.

[0003]

In the link processing as described above, the scanning time for processing varies.
When the capacity is large, there is a problem that the dispersion becomes particularly large and the scan time becomes long. This makes it difficult to improve input / output responsiveness and to speed up tool processing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to reduce the influence of scan time variations and to perform programmable processing with a balance according to the user. A link processing method of a controller is provided.

[0005]

According to a first aspect of the present invention, a data copy capacity per scan of a CPU unit is freely set, and a notification of reception completion or a notification of transmission permission is linked. The CPU unit received from the unit performs the copy processing of the transmission data copied from the data storage memory in the buffer of the link unit or the reception data copied from the buffer of the link unit to the memory in the CPU unit by the data copy capacity set in advance. only and the monitor performed in a single scan, is retracted any remaining data to the copy source leading address and the next copying Sakia dress work memory to refer to the time of copy processing of the next scan at the end of the scan, all subsequent receiving data or copy process及beauty double Utsushisaki top each scan until copying of the transmission data is completed It was repeated a save processing dress the copy source leading address, the link of the programmable controller to issue all incoming request or transmission request to the link units after copying the received data or transmission data is completed
Processing method, high-speed transfer to the memory of the CPU unit
Data storage area for exchanging data by means
A me area is provided, and the CPU unit is
From the point when reception is completed
Only the copy capacity per scan from the
Copying of all received data is completed.
Repeat every scan until all received data is copied
After completion, the data is deleted from the dummy area by the high-speed transfer means.
It is characterized by batch copying to the data area.

According to a second aspect of the present invention, one of the CPU units
The data copy capacity per scan can be set freely, and
Notification from the link unit
The removed CPU unit is stored in the link unit buffer.
The transmission data or link copied from the data storage memory
From the buffer of the CPU unit to the memory in the CPU unit
The copy processing of the received data to be copied is set in advance.
Perform one scan for the data copy capacity, and
If there is remaining data at the end of the scan,
Refers to the copy source start address when copying in the next scan
To the work memory, and then receive all
Each scan until data or transmission data copying is completed
Copy processing, copy destination top address and copy source top address
Process is repeatedly performed to save all received data or
Is received by the link unit after the transmission data has been copied.
Programmable controller that issues a transmission request or transmission request
In the link processing method, a data storage area for transmitting and receiving data by a high-speed transfer means and a dummy area are provided in the memory of the CPU unit , and the CPU unit performs high-speed processing at the beginning of a scan that is enabled for transmission during transmission processing. The transfer means collectively copies all of the transmission data to the dummy area, and after copying, copies only the copying capacity to be processed per scan from the dummy area to the buffer of the link unit. It is characterized in that it is repeated for each scan until copying is completed.

[0007]

[0008]

According to the first aspect of the present invention, by dividing the link processing, the scan time can be reduced.
Variation in scan time due to link processing can be reduced, thereby improving input / output response, speeding up tool processing, and speeding up other link processing. Further, since the user can set the copy capacity of the data per scan, the processing can be executed in a balance according to the user.

According to the second or third aspect of the present invention, it is possible to guarantee the synchronization of data transfer when the link processing is divided.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 shows a basic configuration of a programmable controller used in the present invention.
PU1 and an address bus, a data bus,
A read / write is controlled by a control bus, a RAM 2 is used as an operation memory and a data memory, and is used as a work area and the like. A ROM 3 in which a program of a basic operation of the system or a fixed user program is written. a memory unit comprising, a I / O device 4 for input from the control or the external device of the external device, an interface 5 for connecting peripheral tool 6 programmers such, the link with the co-down computer 9 And a link unit 7 for assembling, the CPU 1 and the RAM
2. The ROM 3 constitutes the CPU unit 8. The link unit 7 is a buffer 1 for temporarily storing transmission / reception data.
Has zero.

A program controller is constituted by the above-described structure. An embodiment of a link processing method according to the present invention used in the program controller will be described with reference to a flowchart shown in FIG. First, the user sets the copy capacity per scan using the peripheral tool 6 or the like. This set data is RA
The data is stored in M2, and the CPU 1 determines the data copy capacity at the time of link processing based on the set contents.

Now, when the actual copying process is not being executed, the CPU unit 8 sets the total area capacity of the received data in the work area of the RAM 2 under the control of the CPU 1 and controls the copy source top address under the control of the CPU 1. And the copy destination start address are set. Next, upon receiving the notification of the completion of reception from the link unit 7, the CPU 1 extracts the copy source start address and the copy destination start address set in the work area, and refers to these addresses from the buffer 10 of the link unit 7 in advance. The data corresponding to the set copy capacity per scan is transferred to the RAM 2
Copy to

If the copying of all the received data areas is not completed in this scan after this copying, the next copy source top address and copy destination top address are saved in the work area, and a flag indicating that the actual copy process is in progress is made. Reflect,
Wait for the next scan. Thereafter, the above-described copying processing and address saving processing are repeated for each scan until copying of all the reception data areas is completed.

When the copying of all the received data areas is completed, the completion of the actual copying process is reflected in the flag, the next receiving request is issued, and the receiving process is completed. The transmission process is basically the same as the reception process, except that the copy destination and the copy source are changed. In other words, if there is a notification that transmission is possible from the link unit 7, a RAM corresponding to the copy source start address set in the work area and the copy destination start address is stored in the RAM.
2 is transferred and copied to the buffer of the link unit 7. Of course, the copy capacity per scan is set by the user. After the transfer and copying of all transmission data to the link unit 7 is completed, a transmission request is issued from the CPU 1 to the link unit 7 to end the transmission processing.

In the data copying process, the scan when the copying is completed may be a copy of less than the capacity of one scan. . That is, copying is performed for the capacity up to the end of the remaining area. By the way, when the link processing is performed in a divided manner as in the above-described embodiment, it is required to guarantee data synchronization.

A second embodiment described below has been realized. (Embodiment 2) FIG. 3 shows a conceptual configuration showing the features of the present embodiment.
2 is a data area A for storing transmission and reception data.
And a dummy area B for temporarily storing data, and data transfer between the areas A and B is performed by high-speed transfer means (not shown) such as DMA.

Next, reception processing and transmission processing in this embodiment are performed based on the flowcharts of FIGS. FIG.
In the receiving process shown in FIG.
If the unit 8 is notified of the completion of reception, the CPU 1 first copies the received data from the buffer 10 of the link unit 7 per scan based on the copy source start address and the copy destination start address stored in the work area of the RAM 2. Transfer and copy to the dummy area B by the capacity.

If the whole area of the received data cannot be copied by this scan, the actual copy processing is executed after the next copy source top address and copy destination top address are saved in the work area as in the above-described embodiment. Reflect the inside to the flag.
Thereafter, the above-described transfer copying process is performed for each scan until copying of the entire area of the received data is completed. When copying is completed, C
The PU 1 collectively copies the data from the dummy area B to the data area A by a high-speed transfer means such as a DMA, reflects the completion of the actual copy processing in a flag, further issues a next reception request, and ends the reception processing.

In the transmission process shown in FIG. 5, if the link unit 7 notifies the CPU unit 8 that transmission is possible,
U1 first copies all transmission data from the data area A to the dummy area B by DMA in the first scan after transmission is enabled. In the subsequent scan, the transmission data is transferred from the dummy area B to the buffer 10 of the link unit 7 by the copy capacity per scan based on the copy source start address and the copy destination start address stored in the work area of the RAM 2. Transfer and copy.

If the entire area of the transmission data cannot be copied by this scan, the actual copy processing is executed after the next copy source top address and copy destination top address are saved in the work area, as in the above-described reception processing. Reflect the inside to the flag. Thereafter, the above-described transfer copying process is performed for each scan until copying of the entire area of the transmission data is completed. When the copying is completed, the CPU 1 reflects the completion of the actual copying process on the flag, issues the next transmission request, and ends the transmission process.

In the data copying process, a scan when the copying is completed may be a copy of less than the copying capacity of one scan. That is, copying is performed for the capacity up to the end of the remaining area.

[0022]

According to the first aspect of the present invention, the data copy capacity per scan of the CPU unit can be set freely, and a notice of reception completion or a notice of transmission permission is received from the link unit. The CPU unit copies the transmission data to be copied from the data storage memory into the buffer of the link unit or the reception data to be copied from the buffer of the link unit to the memory of the CPU unit by an amount corresponding to the data copy capacity set in advance by 1
And the monitor performs a scan, is retracted any remaining data for the next copying Sakia dress the copy source leading address in the work memory to refer to the time of copy processing of the next scan at the end of the scan, all subsequent receiving data or transmission data copying performed by repeating the copying process及beauty double Utsushisaki start address for each scan to complete the process of saving the copy source leading address, link after the copying of all of the received data or transmission data has been completed The link processing method of the programmable controller that issues a reception request or transmission request to the unit.
Data to the CPU unit memory by high-speed transfer means.
The data storage area for data transfer and the dummy area
The CPU unit determines that reception has been completed during the reception process.
From the link unit buffer
Process to copy only the copy capacity per unit to the dummy area
Scans until all received data has been copied
After the copying of all received data is completed,
High-speed data transfer from dummy area to data area
Since the batch copying is performed, the link processing is divided and the scan time can be reduced, and the scan time variation due to the link processing can be reduced.
This improves the input / output response, speeds up tool processing,
There is an effect that the speed of other link processing can be increased, and the user can set a copy capacity of data per scan, so that the processing can be executed in a balance according to the user, and furthermore, the link can be executed. Split processing
There is an effect that is Ru possible to guarantee the simultaneity of data transfer at the time.

According to a second aspect of the present invention, one of the CPU units
The data copy capacity per scan can be set freely, and
Notification from the link unit
The removed CPU unit is stored in the link unit buffer.
The transmission data or link copied from the data storage memory
From the buffer of the CPU unit to the memory in the CPU unit
The copy processing of the received data to be copied is set in advance.
Perform one scan for the data copy capacity, and
If there is remaining data at the end of the scan,
Refers to the copy source start address when copying in the next scan
To the work memory, and then receive all
Each scan until data or transmission data copying is completed
Copy processing, copy destination top address and copy source top address
Process is repeatedly performed to save all received data or
Is received by the link unit after the transmission data has been copied.
Programmable controller that issues a transmission request or transmission request
A data storage area for exchanging data by high-speed transfer means and a dummy area in the memory of the CPU unit, and the CPU unit operates at a high speed at the beginning of a scan that is enabled for transmission during transmission processing. The transfer means collectively copies all of the transmission data to the dummy area, and after copying, copies only the copying capacity to be processed per scan from the dummy area to the buffer of the link unit. Link processing is repeated for each scan until copying is completed.
Is a splitting process, which can reduce scanning time.
In addition, the scanning time varies due to link processing.
Of the input / output response.
Above, faster tool processing, faster other link processing
Has the effect of enabling
User can set the amount of data to be copied
Therefore, processing can be executed in a balance according to the user.
In addition, there is an effect that the simultaneity of data transfer when the link processing is divided can be guaranteed.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a programmable controller used in the method of the present invention.

FIG. 2 is a flowchart of a receiving process according to the first embodiment of the method of the present invention.

FIG. 3 is a conceptual configuration diagram of Embodiment 2 of the method of the present invention.

FIG. 4 is a flowchart of a reception process of the embodiment.

FIG. 5 is a flowchart of a transmission process of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 2 RAM 3 ROM 4 I / O device 5 Interface 6 Peripheral tool 7 Link unit 8 CPU unit 9 Computer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G05B 19/05 G06F 17/40

Claims (2)

(57) [Claims] The CPU unit, which can freely set the data copy capacity per scan of the CPU unit, receives a notification of completion of reception or a notification of transmission permission from the link unit, and copies the data from the data storage memory to a buffer of the link unit. data or and the monitor performed from the buffer of the link unit in the data copying capacity of only one scan of the copy processing of the received data to be copied in a memory in the CPU unit set in advance, following any remaining data at the end of the scan The copy destination address and copy source top address are saved in the work memory for reference during the copy processing of the next scan, and thereafter, the copy processing and the copy destination are performed for each scan until copying of all the received data or transmitted data is completed. The save process of the start address and the copy source start address is repeatedly performed, In the programmable controller of the link processing system issues a receive request or transmission request to the link units after copying the received data or transmission data is completed in
And high-speed transfer means to the memory of the CPU unit.
Data storage area and dummy area for exchanging data
And the CPU unit completes the reception during the reception process.
From the link unit buffer
Copy only the copy capacity per scan to the dummy area
Scanning until all received data has been copied.
After each copy of received data is completed
In addition, the high-speed transfer means changes the dummy area to the data area
A link processing method for a programmable controller, which performs batch copying on a computer. 2. The data per scan of the CPU unit.
Copy capacity can be set freely,
CPU unit that received the notification of the trust from the link unit
Is the data storage memory in the buffer of the link unit?
Data to be copied from the server or re-copy processing and destination
Repeat save process of start address and copy source start address
To complete the copying of all received or transmitted data.
Issue a reception request or transmission request to the link unit.
The process of copying to the buffer
Of the CPU unit from the buffer of the link unit.
The copy processing of the received data to be copied to the memory is set in advance.
To perform in one scan for the above data copy capacity
If there is any remaining data at the end of scanning,
Copy processing of next scan for dress and copy source top address
Is saved to the work memory for future reference.
Wait until all received or transmitted data has been copied.
Programmable until all copies are completed for each scan
In the link processing method of the controller, a data storage area for exchanging data by high-speed transfer means and a dummy area are provided in the memory of the CPU unit. in high-speed transfer means by collectively copied all of the transmission data in the dummy area, features and to pulp programmer repeating only copying capacity of to be processed per scan later copied from the dummy areas for each catcher down link units Link controller link processing method.