TS Quality Support

TS Event OPC item have not only the value quality, but also the time quality associated with it. The time quality is provided in the high 8 bits of the OPC Quality Word which are available for vendor specific use:

• bits 7 to 0 - OPC quality flags,

• bits 15 to 8 - Timestamp quality.

The time quality is available in SCADA v7.20 only via a separate tag and it will be stored and displayed by the alarm system in SCADA v7.30.

Time quality is defined as follows:

• bits 4 to 0 – Time Accuracy

  These bits represent a time accuracy (values 2-24) or one of the error codes:

  • 27 Clock In Sync

  • 28 TSInit

  • 29 IO Channel error

  • 30 Invalid

  • 31 Unspecified

• bit 5 - Clock Not Synchronized

• bit 6 - Clock Failure

• bit 7 - Leaps Seconds Known