PLC SYSTEM

• US 20160124414A1
• Filed: 10/30/2015
• Published: 05/05/2016
• Est. Priority Date: 10/30/2014
• Status: Active Grant

• Current Assignee: LSIS Co. Ltd. (LS Corporation)
• Original Assignee: LSIS Co. Ltd. (LS Corporation)
• Inventors: HAN, SEUNG SHIN
• Granted Patent: US 10,012,972 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G05B 19/05 Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
• CPC Class Codes: G05B 19/056 Programming the PLC
• CPC Class Codes: G05B 2219/1144 Program, program I-O module
• CPC Class Codes: G05B 2219/15038 Internet, tcp-ip, web server see under S05B219-40
• CPC Class Codes: G05B 2219/32136 Web service oriented architecture for manufacturing and automation
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/06 specially adapted for file transfer, e.g. file transfer protocol [FTP]
• CPC Class Codes: H04L 67/104 Peer-to-peer [P2P] networks

Abstract

A programmable logic controller (PLC) system is provided. The programmable logic controller (PLC) system includes a storage unit storing a user program; a main control unit performing a scan operation based on the user program, measuring a scan time required for the scan time, and determining whether there is a need to process a web based service; and a web based service control unit processing the service data based on the scan time service request details, and service data that are transmitted from the main control unit, according to a result of the determination on whether there is a need to process the web based service.

Claims

1. A programmable logic controller (PLC) system comprising:

a storage unit storing a user program;

a main control unit performing a scan operation based on the user program, measuring a scan time required for the scan time, and determining whether there is a need to process a web based service; and

a web based service control unit processing the service data based on the scan time service request details, and service data that are transmitted from the main control unit, according to a result of the determination on whether there is a need to process the web based service.

2. The programmable logic controller (PLC) system according to claim 1, wherein the web based service control unit determines an amount of service processed, based on the scan time.

3. The programmable logic controller (PLC) system according to claim 1, wherein the web based service control unit divides the scan time based on a certain range and determines an amount of data processed according to the certain range.

4. The programmable logic controller (PLC) system according to claim 3, wherein the web based service control unit processes the service data based on determination on a range to which the scan time belongs and the amount of data processed in the range to which the scan time belongs, as a result of the determination.

5. The programmable logic controller (PLC) system according to claim 1, wherein the main control unit determines whether a web based service processing request is input after completion of the scan operation, and transmits, to the web based service control unit, the scan time, the service request details and the service data when the web based service processing request is input.

6. The programmable logic controller (PLC) system according to claim 1, wherein the scan time is in inverse proportion to the amount of data processed.

7. The programmable logic controller (PLC) system according to claim 1, wherein the web based service control unit comprises:

a storage unit storing an amount of data processed according to a scan time;

a management unit determining an amount of data processed according to the scan time based on the stored amount of data processed according to the scan time, and outputting a certain amount of service data according to the determined amount of data processed; and

a processing unit receiving service data from the management unit, processing the received data according to the service request details, and transmitting a result of processing to the management unit.

8. The programmable logic controller (PLC) system according to claim 7, wherein the web based service processed by the processing unit comprises at least one of a peer to peer (P2P) based service, a high speed link based service, a hyper text transfer protocol (HTTP) based service, a file transfer protocol (FTP) based service, a simple network time protocol (SNTP) based service, and a simple mail transfer protocol (SMTP) based service.

9. The programmable logic controller (PLC) system according to claim 7, wherein the storage unit stores a priority according to a service.

10. The programmable logic controller (PLC) system according to claim 9, wherein the management unit determines priorities for service details with reference to the priority according to the service when the service details are included in the service request details, and outputs service data according to the determined priority.

11. The programmable logic controller (PLC) system according to claim 10, wherein the priority according to the service comprises at least one of a priority between a control data transmission and reception service and a user convenience service, a priority between services included in the control data transmission and reception service, and a priority between services included in the user convenience service.

12. The programmable logic controller (PLC) system according to claim 11, wherein the control data transmission and reception service comprises a P2P based service and a high speed link based service.

13. The programmable logic controller (PLC) system according to claim 11, wherein the user convenience service comprises an HTTP based service, an FTP based service, an SNTP based service, and an SMTP based service.