JP3095276B2 - Sequence controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In the present invention, in addition to control using a conventional sequence controller (programmable controller), a sequence controller creates necessary data and transfers the data to an intelligent high-performance module. The present invention relates to a system for performing more advanced control by combining a high-performance module and a sequence controller.

[0002]

2. Description of the Related Art In order to realize FA and CIM, in addition to control using a conventional sequence controller, it is necessary to perform positioning processing, data conversion, port communication processing, and the like using an intelligent high-performance module. There is.
For this reason, necessary data must be transferred from the sequence controller in advance in order to instruct the high-performance module on the contents of control. In addition, the control result must be transferred to the programmable controller. Therefore, as described in JP-A-63-36304, a conventional apparatus executes a dedicated transmission command and a reception command using a procedure of a handshake process with a sequence program created by a user to transfer data. I have to. In another conventional example, the sequence program E
In some cases, data transfer is performed by ND processing.

[0003]

In the prior art relating to data transfer between a sequence controller and an intelligent high-performance module, a data transfer command for transmission and reception is, for example, one data transfer in one scan of a user program. However, there is a problem in that it takes a very long time to refresh all data when the scan time of the user program is taken into consideration.

[0004] In addition, since there are transmission and reception instructions as instructions for data transfer, a user program must be configured so that the reception processing is started after the transmission processing is completed. However, there is a problem that the user program becomes very complicated.

An object of the present invention is to provide a sequence controller having instructions for facilitating high-speed data transfer and creation of a user program in data transfer processing between the sequence controller and an intelligent high-performance module. is there.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to provide, among instructions for performing data transfer processing between a sequence controller and a high-performance module, a process of repeatedly performing data transfer for a specified time and a process for repeating the process. This is achieved by a sequence controller having a pulse generator that can be referred to and that repeats ON / OFF at regular intervals to measure time.

Further, one data transfer command is constituted by a transmission processing unit and a reception processing unit, and when the transmission processing is completed, the reception processing is automatically started.

[0008]

The sequence controller sets necessary data in the transmission data area of the data memory in order to transfer data to the intelligent high-performance module. When the data transfer instruction is executed, data is extracted from the transmission data area by system processing in the ROM and written into the gate array of the interface. By counting pulses of 1 msec period automatically generated by hardware, it becomes possible to perform transmission processing continuously for a time designated by the user. Further, after the transmission is completed, the reception processing is automatically executed, and the reception processing can be executed for the user-specified time in the same manner as described above.

[0009]

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

FIG. 1 is a block diagram of a part related to execution of a communication instruction of a sequence controller to which the present invention is applied and an environment of the part. In the figure, reference numeral 1 denotes a user program memory, which is a RAM for storing a control program usually created by a user. The high-speed communication command (TRNS command) according to the present invention is also stored in the RAM. 2
Is a data memory, in a communication command, an area 2a for storing transmission data to be transferred to the high-performance module;
It has an area 2b for storing data received from the high-performance module for transmission processing, and an area 2c for storing communication command parameters. Reference numeral 4 denotes a system ROM memory in which an actual processing procedure of a communication command is stored. When the user program is executed and the communication command in the user program is executed, the control is transferred to the system ROM memory 4 and the transmission and reception with the high-performance module 6 are performed. After the processing is completed, the control returns to the user program memory 1 to perform the processing after the communication instruction. Reference numeral 5 denotes a central processing unit (CPU) of the sequence controller. Reference numerals 7 and 8 denote input modules and output modules of the sequence controller. The high function module 6 is a communication control module in the present embodiment, and includes an interface (I / F) unit 10 for interfacing with the sequence controller 9, an input buffer 11 for temporarily storing data input from the sequence controller 9, From an output buffer 12 for temporarily storing data to be output to the sequence controller 9, a ROM 13 for storing a control program for the high function module 6, an interface unit 14 for interfacing with an external communication destination, and an MPU 15 for controlling the entire high function module 6. Become.

FIG. 2 shows a control flow of a communication command in the system ROM memory 4 of FIG. Step 20 in FIG.
First, data transmission processing to the high-performance module is performed. Next, in step 21, it is determined whether or not all data has been transmitted in the transmission processing in step 20.
If all data has been transmitted, the process proceeds to step 23, where a reception process for receiving a response from the high-performance module is performed. If data that has not been transmitted still remains, the process proceeds to step 22. In step 22, it is monitored how long the transmission process takes, and if the time specified by the user has not elapsed,
It returns to the transmission process of step 20. If the specified time has elapsed, the process proceeds to step 26, and this flow is terminated.
Transmission processing is performed again in the next scan of the user program. Regarding the reception processing in steps 23 to 25,
This is the same as the transmission process.

FIG. 3 shows a sequence controller 9 in the transmission processing and the reception processing shown in the control flow of FIG.
2 shows a communication procedure between the MFP and the high-performance module 6. The communication procedure between the sequence controller 9 and the high function module 6 is performed by a handshake procedure using the control signal H.S1 on the sequence controller side and the control signal H.S2 on the high function module side.

First, when data is transferred from the sequence controller 9 to the high function module 6 in the transmission processing, the data to be sent is set in the interface unit 10 and the H.S1 of the sequence controller 9 is turned on (). After confirming that H.S1 is ON, the high-performance module 6 reads data from the interface unit 10 and turns on H.S2 to notify the sequence controller 9 of the reading (). Sequence controller 9 turns on H.S2
Is confirmed, H.S1 is turned off, and the high function module 6 also turns off H.S2 (). The above is a series of processes of transmission from the sequence controller 9 to the high-performance module 6. In the case of reception, the procedure is the reverse of the above, but the same processing () is performed.

FIGS. 4 and 5 show the transmission processing and the reception processing of steps 20 and 23 in FIG. 2 in the control flow using the handshake procedure of FIG. 3, respectively.
It is.

In the transmission process shown in FIG. 4, the state of H.S1 is checked in step 40. If it is OFF, the process proceeds to step 45, and if it is ON, the process proceeds to step 41. Step 41
Then, the state of HS2 is checked.
The process ends in step 7, and if it is OFF, the process proceeds to step 42. In step 42, the data writing process causes the interface unit 10 between the high-performance module 6 and the sequence controller 9 to send the transmission data area 2a of FIG.
Is set, and the high function module 6 receives it as transmission data. In the subsequent counter updating process in step 43, the number of transmission data is counted. Furthermore,
This count result is used for the transmission end determination in step 21 of FIG. In step 44 following step 43,
S2 is turned on, and the process ends in step 47. On the other hand, in step 45, the state of HS
If so, the process proceeds to step 47 and ends. If it is ON, the process proceeds to step 46, H.S2 is turned OFF, and the process ends.

In the receiving process of FIG. 5, the state of H.S2 is checked in step 50. If it is OFF, the process proceeds to step 55, and if it is ON, the process proceeds to step 51. Step 51
Then, the state of HS1 is checked.
The process ends in step 7, and if it is OFF, the process proceeds to step 52. In step 52, the data set from the high-performance module 6 is read by the sequence controller 9 to the interface unit 10 between the high-performance module 6 and the sequence controller 9 by the data reading process, and the received data is read as shown in FIG. Is set in the reception data area 2b. In the subsequent counter updating process in step 53, the number of received data is counted. Further, the count result is used for the reception termination determination in step 24 of FIG. H · S1 is turned on in step 54 following step 53
Then, the process ends in step 57. On the other hand, in step 55, the state of H · S1 is checked, and if it is OFF, the process proceeds to step 57 and ends. If it is ON, the process proceeds to step 56, H.S1 is turned OFF, and the process ends.

FIGS. 6 and 7 show a control flow for counting the time required for the transmission processing and an example of counting the elapsed time. A hardware pulse that repeats ON / OFF at a 1 ms period shown in FIG. 7 is prepared as a reference for counting the elapsed time.

In FIG. 6, in step 60, the state of the pulse (ON / OFF) is read and stored. This corresponds to FIG. In step 61, the transmission processing shown in FIG. 4 is performed, and in step 62, it is determined whether transmission of all data has been completed. Then, in step 63,
Read the state of the pulse after transmission processing. This corresponds to FIG. The pulse state is ON as determined in step 64
If so, the process proceeds to step 65, where the state of the previous pulse is determined. The previous state is the state at the start of the execution of the communication command read in step 60, but since it is ON, the flow proceeds to step 67, and the state of the pulse read in step 63 is set as the state of the current pulse, and the state of the previous pulse In the area. Step 6 if the previous state was OFF
At 6, the execution time is counted up, and the routine goes to step 67.

In step 68, the execution time of the instruction counted up by passing through step 66 is compared with the time designated by the user. If the designated time has elapsed, the processing is terminated, and the next scan is performed. Do with. If the specified time has not elapsed, the transmission process of step 61 is performed again. The reception process after all the data transmissions are confirmed in step 62 is the same as the process in FIG. 6, and therefore the detailed flow is omitted.

FIG. 8 shows how the contents of the transmission data area 2a are transmitted for each scan. Transmission data area 2 allocated on data memory
“a” designates the head of the communication command as a parameter. The size of the data to be transmitted is set at the head of the transmission data area 2a, and thereafter the transmission data is set and the communication command is executed. The communication command transmits data of this size to the high-performance module 6. In the first scan in which the communication is started, the first communication with the high-performance module is performed for a time designated by the user. The block of transmission data is transmitted by the communication for the user-specified time. , Are transmitted in the second and third scans, and are repeated until all transmission data is transmitted.

FIG. 9 shows a case where transmission processing is performed according to a conventional procedure for comparison with the present invention. The configuration of the transmission area is the same, but the size of the data transmitted in one scan is one word or less,
It is very inefficient compared to the case of using communication instructions for high-performance modules. When transmitting the same 200-word data to one of the high-performance modules, the number of scans from the first scan to the end of the communication start is 300 in the conventional case, but 50 in the case of using this command, Data can be sent at high speed.

[0022]

According to the present invention, the data transfer processing for transmission and reception between the sequence controller and the intelligent intelligent module can be performed during one scan for the time designated by the user. For this reason, the number of scans until the transfer of all data is completed can be reduced, and finally high-speed data transfer becomes possible.

Further, since transmission and reception can be performed by one command, the configuration of the program is simplified, and maintenance is easy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a sequence controller according to the present invention and the configuration of its environment.

FIG. 2 is a flowchart of internal processing of a communication command in the embodiment.

FIG. 3 is a timing chart of a procedure at the time of transmission and reception using a handshake signal between a sequence controller and a sophisticated module.

FIG. 4 is a flowchart showing a detailed flow of a transmission process in FIG. 2;

FIG. 5 is a flowchart showing a detailed flow of a reception process in FIG. 2;

FIG. 6 is a flowchart showing a detailed flow of a process of counting elapsed time in FIG. 2;

FIG. 7 is a timing chart showing the timing at which the instruction execution time is counted up according to the detailed flow of FIG. 6 using a hardware pulse having a cycle of 1 msec.

FIG. 8 is an explanatory diagram showing a configuration of a transmission data area when a communication command for a high-performance module is used, and a relationship between a scan and a transmission block.

FIG. 9 is an explanatory diagram of a conventional example for comparison with FIG.

[Explanation of symbols]

1. User memory, 2. Data memory, 4. System R
OM memory, 5 ... CPU, 6 ... high-performance module, 7 ...
Input module, 8 ... output module.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-36304 (JP, A) JP-A-3-282905 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G05B 19/04-19/05

Claims (3)

(57) [Claims] 1. A sequence controller having a dedicated command for data transfer processing between a sequence controller and an intelligent high-performance module mounted on the sequence controller, wherein the pulse repeats ON / OFF at a constant cycle. Generate a par
A pulse generating unit, and the dedicated instruction refers to the pulse to
A sequence controller that performs data transfer processing for a user- specified time . 2. A data transfer command according to claim 1, wherein data is transferred from the sequence controller to the intelligent high-performance module, and a response to the data is performed by a single data transfer command until the data is transferred from the high-performance module to the sequence controller. A sequence controller characterized by the following. 3. A sequence according to claim 1, wherein one data transfer command comprises a transmission processing unit and a reception processing unit, and when the transmission processing is completed, the reception processing is automatically started. controller.