| The Performance of OPC-UA Security Model at Field Device Level Recent countries visiting this post |  |
 | 4 | United States |
 | 3 | Russian Federation |
 | 1 | |
 | 1 | Austria |
| The Performance of OPC-UA Security Model at Field Device Level Recent countries visiting this post | |
| 4 | United States |
| 3 | Russian Federation |
| 1 | |
| 1 | Austria |