Time Quality Description

For time stamped variables, OFS provides data related to the timestamp quality to AVEVA Plant SCADA.

The timestamp quality is an 8 bits time quality flag contained within the OPC flags for the OPC item.

Time quality configuration and display is available in AVEVA Plant SCADA as described in the following topics.

Time Quality in AVEVA Plant SCADA

AVEVA Plant SCADA introduces an SOE page which displays events in a SOE format. Each record represents a single change of an event. This page can also be used to display time stamped event data with time quality.

In the Active Alarm page and the SOE page, 2 columns display time quality information:

• TSQuality: Displays a string that is the synthetic representation of the time quality. The string takes one of the following values:

  • Time Good

  • Time Uncertain

  • Clock Not Synchronized

• Quality: Displays a numeric value reflecting the OPC quality flag. This value is built as follows:

  • Highest 8 bits represent the time quality.

  • Lowest 8 bits represent the quality, substatus, and limit status according to the OPC specification. More details are provided in section The Quality Tag Element of AVEVA Plant SCADA User Guide or AVEVA Plant SCADA Help.

To display the Active Alarm and SOE pages (not displayed by default), the following init parameters need to be modified by the user:

• [Format]Alarm

• [Format]SOE

To display TSQuality and Quality information, the user needs to include the fields TSQuality and Quality in the list of columns of:

• [Format]Alarm

  Example: [Format]Alarm = {Time,101}{OnTime,101}{Tag,100}{Name,181}{TSQuality,100}{Quality,50}

• [Format]SOE

  Example: [Format]SOE = {Time,101}{Message,250}{Source,100}{Name,181}{TSQuality,100}{Quality,50}

More details on [Format]Alarm and [Format]SOE parameters is provided in sections Alarm display fields of AVEVA Plant SCADA User Guide or AVEVA Plant SCADA Help, and in topic [Format]FormatName of AVEVA Plant SCADA Help.

Configure an Alarm to Display SOE Uncertain Sequence

To display the uncertain SOE sequence (sequence during which some events may be lost), each event source needs to be configured as follows:

• A variable tag is associated to the source SOE uncertain variable.

• A time stamped digital alarm is configured for each variable tag previously associated.

The SOE uncertain variable address depends on the time stamping module type and its location:

• BME P58 •••• CPU. The variable needs to be created by the user in Control Expert and mapped on %SW73.7 system word (SOE_UNCERTAIN).

• BM• CRA 312 10 module in a Modicon X80 Ethernet RIO drop: The variable is mapped on the SOE_UNCERTAIN field of the BM• CRA 312 10 Device DDT. The Device DDT variable is automatically created in Control Expert, and it has a T_M_DROP_EXT_IN type. The variable is named SOE_UNCERTAIN.

• BMX ERT 1604 T module in a Modicon X80 Ethernet RIO drop: The variable is mapped on the SOE_UNCERTAIN field of the BMX ERT 1604 T Device DDT. The Device DDT variable is automatically created in Control Expert, and it has a T_M_DIS_ERT type. The variable is named ERT_SYNC.SOE_UNCERTAIN.

• BMX ERT 1604 T module in a Modicon M340 local drop: The variable needs to be created by the user in Control Expert and mapped on %IW0.n.0.3.7 (where n represents the module position in the rack).

Configure an Alarm to Display TS Event Source Disconnection

To display the status of the connection with the event source, associate 1 digital alarm per source with a specific item: <direct_address>!#PlcQualStatus where <direct_address> is the address of the source. For more details, refer to Specific Items > Description topic in OPC Factory Server User Manual.