Time Synchronization Between EtherCAT Network and External Processor
| Autor: | Youngwoo Kwon, Joon-Young Choi, Sung-Mun Park |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Computer science
business.industry Latency (audio) 020206 networking & telecommunications EtherCAT 02 engineering and technology Propagation delay Networked control system Synchronization Computer Science Applications Shared memory Modeling and Simulation Embedded system Synchronization (computer science) 0202 electrical engineering electronic engineering information engineering Process control Electrical and Electronic Engineering System time business |
| Zdroj: | IEEE Communications Letters. 25:103-107 |
| ISSN: | 2373-7891 1089-7798 |
| DOI: | 10.1109/lcomm.2020.3027388 |
| Popis: | We employ an external processor to distribute the master computing load in the EtherCAT networked control system and develop a method for time synchronization between the Linux on the external processor and EtherCAT network. The synchronization between the Linux on the external processor and EtherCAT master is performed by using general-purpose input/output and shared memory, and the synchronization accuracy is significantly improved by compensating for the system time setting latency and general-purpose input detection latency in the EtherCAT master. The developed method is implemented as part of the master application without modifying the EtherCAT protocol or requiring an excessive computational load. By performing extensive experiments and analyzing the results, we demonstrate that the developed method achieves the synchronization error means less than 1 $\mathrm {~ \mu s}$ with standard deviations less than 5 $\mathrm {~ \mu s}$ between the external processor and EtherCAT network. This synchronization accuracy can be acceptable for various networked control applications based on Linux. |
| Databáze: | OpenAIRE |
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