Power Down/Up of the Time Stamping Module

NOTE: In order for the modules to start to time stamp, the SCADA server has to be started and connected, and the communication between the SCADA server and the modules has to be initialized.

Power down/up operating mode is assumed to occur while time stamping module is time stamping events and the SCADA system is running.

The time stamping module power down is detected by the SCADA system through a specific item: #PLCQualStatus. #PLCQualStatus = QUAL_DEVICE_FAILURE indicates that the module is not operational. In the following example table, the device failure detection is signaled in sequence number 4.

SOE Sequence on Power Down/Up of the Time Stamping Module

Sequence followed on time stamping module power up (after a power down):

  • The events stored in the module buffer before power down (and not read in the buffer) are available for the SCADA system (events from sequence number 1 to 3 in the following table).

  • Signalization of time stamping module power down and power up (see following table, sequences number 4 and 5).

  • The rest of the sequence is the same as sequences number 1 to 6 in the initial start SOE sequence (see following table, sequences number 6 to 13).

The following table presents the SOE sequence on power up provided by a BMX CRA 312 10 time stamping module with 3 time stamped inputs and 1 time stamped output (after a power down):

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

CRA device failure detection

1

OFS internal time

Not applicable

5

CRA device failure detection

0

OFS internal time

Not applicable

6

SOE_UNCERTAIN (1.)

(0 -> 1)

1

Internal CRA time

(not synchronized)

ClockFailure

and ClockNotSynchronized

7

CRA INPUT 1

(1 -> 0)

0

Internal CRA time

(not synchronized)

ClockFailure

and ClockNotSynchronized

8

CRA INPUT 2

(0 -> 1)

1

Internal CRA time

(not synchronized)

ClockFailure

and ClockNotSynchronized

9

CRA INPUT 3

(0 -> 1)

1

Internal CRA time

TSInit

10

CRA OUTPUT 4

(1 -> 0)

0

Internal CRA time

TSInit

11

SOE_UNCERTAIN (1.)

(1 -> 0)

0

Internal CRA time

Time Resolution = 1 ms

12

CRA INPUT 1

(0 -> 1)

1

Internal CRA time

Time Resolution = 1 ms

13

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 power up and start of the module assuming that the SCADA server is already started, connected, and operational for communication. SOE_UNCERTAIN event does not appear for the BMX ERT 1604 T module.