Please ensure Javascript is enabled for purposes of website accessibility
Powered by Zoomin Software. For more details please contactZoomin

AVEVA Enterprise SCADA

TABLE OF CONTENTS

Primary-backup configuration example

Save PDF
Save selected topicSave selected topic and subtopicsSave all topics
Share
Share to emailCopy topic URL
  • Last UpdatedApr 24, 2025
  • 2 minute read

This example illustrates a distributed project’s configuration where each system controls its own set of field devices. The primary system, PRI, can view backup system activity and also receive alarms and events that occur on the backup system, BAC1.

The figure below displays the dynamics between a primary, backup, and their remotes while in Primary-backup mode.

The primary system, PRI, can view BAC1 system activity, as well as receive its alarms and events. BAC1 is not able to view any PRI data. PRI also has the ability to modify or add records to BAC1 for routine maintenance. However, PRI cannot control the backup system activity unless BAC1 gives control to the primary system.

This example requires the following configuration:

Requirements for primary-backup mode configuration

Table

Description

oas_system

These records are required to define the PRI and BAC1 systems.

doas_dataset

In the example above, two doas_dataset records are required, one for each system. Specific privileges are assigned uniformly amongst all records in a given mode and system.

doas_mode

In the example above, two doas_mode records are required:

  • INDEPENDENT_CONTROL

  • PRI_CONTROL

    One mode must give PRI full control of the system, in addition to the usual independent control mode where PRI cannot control BAC1. Both modes are, however, members of the same mode group.

doas_privilege

Six doas_privilege records are required for the example above. Three for each mode.

For the INDEPENDENT_CONTROL mode:

  • MFM1 will give PRI full privileges over the dataset for records associated with the primary system.

  • MPS will give PRI partial privileges over the dataset for records associated with the backup system.

  • SCS will give the BAC system control privileges over its own dataset’s records.

    For the PRI_CONTROL mode:

  • MFM2 will give the PRI system full privileges over its own dataset’s records.

  • MCS will give the PRI system control privileges over the dataset records associated with the backup system.

  • SPS will give the BAC system partial privileges over its own dataset’s records.