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

TimeQuality Attributes

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

SOE_UNCERTAIN (1.)

(0 -> 1)

1

Internal CRA time

Time Resolution = 1 ms

5

CRA INPUT 1

(1 -> 0)

0

Internal CRA time

TSInit

6

CRA INPUT 2

(0 -> 1)

1

Internal CRA time

TSInit

7

CRA INPUT 3

(0 -> 1)

1

Internal CRA time

TSInit

8

CRA OUTPUT 4

(1 -> 0)

0

Internal CRA time

TSInit

9

SOE_UNCERTAIN (1.)

(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. SOE_UNCERTAIN event appears only if events can be lost after start and connection of the SCADA server. SOE_UNCERTAIN event does not appear for the BMX ERT 1604 T module.