Introduction

In AVEVA Plant SCADA alarm viewer or event viewer the following information is available once the settings are done:

  • SOE Uncertain alarm or event: Displays beginning and end of uncertain sequences.

  • Time quality: Provides time quality diagnostic and precedence of display.

It is highly recommended to configure and display custom fields for each alarm of event (for example, display the source of alarm or event). Custom fields are filled in during configuration.

Network access to the time stamping module is an OFS-specific item that can be displayed on the SCADA (for more details refer to Specific Items section of OPC Factory Server User Manual). It provides information on module access (specific item in TS Event Group: #PLCQualStatus).

SOE Uncertain Sequence and Time Quality Display

Each source of event SOE uncertain alarms and the time quality associated with every TS event can be displayed in AVEVA Plant SCADA.

Example of SOE uncertain sequence and time quality display on AVEVA Plant SCADA SOE page:

Explanation on Quality field value from previous example:

  • 2752 dec = 00001010 11000000 binary

    Higher and lower part content description

    • 00001010: 1 ms resolution

    • 11000000: OPC Quality Good

  • 7872 dec = 00011110 11000000 binary

    Higher and lower part content description

    • 00011110: Buffer Full

    • 11000000: OPC Quality Good

Quality Display Format

The following table provides the relationship between the TSQuality string and the Quality values (the complete quality information is provided in the Quality column in AVEVA Plant SCADA display):

Context

(Source Status)

Quality Description

( TSQuality)

Quality Highest 8 Bits Binary Value

(Quality)

Comment

Clock not reliable, or initial clock synchronization not done

Time Uncertain

011x xxxx

x xxxx can be equal to:

  • 0 1010: Time resolution is 1 ms

  • 1 1110: Buffer full

  • 1 1100: Values synchronization

  • 1 1101: I/O channel error

Clock not synchronized

Clock Not Synchronized

001x xxxx

x xxxx can be equal to:

  • 0 1010: Time resolution is 1 ms

  • 1 1110: Buffer full

  • 1 1100: Values synchronization

  • 1 1101: I/O channel error

Clock OK + I/O channel error

Time Good

0001 1101

0001 1101 value meaning:

  • 000: Clock OK

  • 1 1101: I/O channel error

Clock OK + Values synchronization (TSInit )

Time Uncertain

0001 1100

0001 1100 value meaning:

  • 000: Clock OK

  • 1 1100: Values synchronization

Clock OK + Buffer full (Invalid)

Time Uncertain

0001 1110

0001 1110 value meaning:

  • 000: Clock OK

  • 1 1110: Buffer full

Clock OK + Time catch up mode (ClockInSync)

Time Uncertain

0001 1011

0001 1011 value meaning:

  • 000: Clock OK

  • 1 1011: Time catch up

Normal operating condition

Time Good

0000 1010

0000 1010 value meaning:

  • 000: Clock OK

  • 0 1010: Time resolution is 1 ms
NOTE: Some detected errors cannot be displayed simultaneously and if this situation occurs, they will be displayed respecting the following precedence order:

  1. I/O channel error (highest priority)

  2. Invalid or TSInit

  3. ClockInSync

PLC Connection Status

If a connection to the PLC is lost, a hardware alarm is generated. The alarm entry contains the I/O device name and the alarm message: I/O Device off-line, cannot talk.

Example of alarm displayed after a PLC connection has been lost:

Event Source Connection/Disconnection

When properly configured, AVEVA Plant SCADA can show the status of the connection with the event source.

Example of source disconnection displayed on AVEVA Plant SCADA SOE page:

Explanation on Quality field value from previous example:

  • 192 dec = 00000000 11000000 binary

    Lower part content description

    • 11000000: OPC Quality Good

OFSOPC Driver Troubleshooting

OFSOPC driver generates extensive logging information at runtime. This information can be used for diagnostics of the driver operation.

Configuring OFSOPC driver logging is described in the Logging section of OFSOPC driver help.

The user can also use the AVEVA Plant SCADA kernel I/O devices window which shows specific statistics and information about each I/O device.