Overview
Restart of the SCADA server is assumed to occur while the time stamping modules are time stamping and their clock is synchronized.
SOE Sequence on Restart of the SCADA Server
Sequence followed on SCADA server restart:
The events stored in the module buffer before SCADA server restart (and not read) are available for the SCADA (events from sequence number 1 to 3 in the following table).
The rest of the sequence is the same as sequences number 1 to 6 in the initial start SOE sequence (sequences number 4 to 11 in the following table). Process values provided after SCADA server restart are signaled by an uncertain sequence of events (sequences number 4 to 8).
The following table presents the SOE sequence on SCADA server restart provided by a BMX CRA 312 10 time stamping module with 3 time stamped inputs and 1 time stamped output:
Sequence Number |
Event |
Event Value |
TimeStamp |
|
---|---|---|---|---|
1 |
CRA INPUT 1 (0 -> 1) |
1 |
Internal CRA time |
Time Resolution = 1 ms |
2 |
CRA INPUT 3 (1 -> 0) |
0 |
Internal CRA time |
Time Resolution = 1 ms |
3 |
CRA OUTPUT 4 (0 -> 1) |
1 |
Internal CRA time |
Time Resolution = 1 ms |
4 |
(0 -> 1) |
1 |
Internal CRA time |
Time Resolution = 1 ms |
5 |
CRA INPUT 1 (1 -> 0) |
0 |
Internal CRA time |
|
6 |
CRA INPUT 2 (0 -> 1) |
1 |
Internal CRA time |
|
7 |
CRA INPUT 3 (0 -> 1) |
1 |
Internal CRA time |
|
8 |
CRA OUTPUT 4 (1 -> 0) |
0 |
Internal CRA time |
|
9 |
(1 -> 0) |
0 |
Internal CRA time |
Time Resolution = 1 ms |
10 |
CRA INPUT 1 (0 -> 1) |
1 |
Internal CRA time |
Time Resolution = 1 ms |
11 |
CRA INPUT 3 (1 -> 0) |
0 |
Internal CRA time |
Time Resolution = 1 ms |
1. |