The merging unit offers a large set of event-logging functions. Critical system and merging unit security-related events are logged to a separate nonvolatile audit trail for the administrator.
Audit trail is a chronological record of system activities that allows the reconstruction and examination of the sequence of system and security-related events and changes in the merging unit. Both audit trail events and process related events can be examined and analyzed in a consistent method with the help of Event List in WHMI and Event Viewer in PCM600.
The merging unit stores 2048 audit trail events to the nonvolatile audit trail. Additionally, 1024 process events are stored in a nonvolatile event list. Both the audit trail and event list work according to the FIFO principle. Nonvolatile memory is based on a memory type which does not need battery backup nor regular component change to maintain the memory storage.
Audit trail events related to user authorization (login, logout, violation remote and violation local) are defined according to the selected set of requirements from IEEE 1686. The logging is based on predefined user names or user categories. The user audit trail events are accessible with IEC 61850-8-1, PCM600 and WHMI.
| Audit trail event | Description |
|---|---|
|
Configuration change |
Configuration files changed |
|
Firmware change |
Firmware changed |
|
Firmware change fail |
Firmware change failed |
|
Attached to retrofit test case |
Unit has been attached to retrofit case |
|
Removed from retrofit test case |
Removed from retrofit test case |
|
Control remote |
DPC object control remote |
|
Test on |
Test mode on |
|
Test off |
Test mode off |
|
Reset trips |
Reset latched trips (TRPPTRC*) |
|
Time change |
Time changed directly by the user. Note that this is not used when the merging unit is synchronised properly by the appropriate protocol (IEEE 1588 v2). |
|
View audit log |
Administrator accessed audit trail |
|
Login |
Successful login from IEC 61850-8-1 (MMS), WHMI or FTP. |
|
Logout |
Successful logout from IEC 61850-8-1 (MMS), WHMI or FTP. |
|
Password change |
Password changed |
|
Firmware reset |
Reset issued by user or tool |
|
Audit overflow |
Too many audit events in the time period |
|
Violation remote |
Unsuccessful login attempt from IEC 61850-8-1 (MMS), WHMI or FTP. |
|
Violation local |
Unsuccessful login attempt from IEC 61850-8-1 (MMS), WHMI or FTP. |
PCM600 Event Viewer can be used to view the audit trail events and process related events. Audit trail events are visible through dedicated Security events view. Since only the administrator has the right to read audit trail, authorization must be used in PCM600. The audit trail cannot be reset, but PCM600 Event Viewer can filter data. Audit trail events can be configured to be visible also in WHMI Event list together with process related events.
| Audit trail event | Authority logging level | |||
|---|---|---|---|---|
|
None |
Configuration change |
Settings edit |
All |
|
|
Configuration change |
● |
● |
● |
|
|
Firmware change |
● |
● |
● |
|
|
Firmware change fail |
● |
● |
● |
|
|
Attached to retrofit test case |
● |
● |
● |
|
|
Removed from retrofit test case |
● |
● |
● |
|
|
Control remote |
● |
● |
||
|
Test on |
● |
● |
||
|
Test off |
● |
● |
||
|
Reset trips |
● |
● |
||
|
Time change |
● |
|||
|
View audit log |
● |
|||
|
Login |
● |
|||
|
Logout |
● |
|||
|
Password change |
● |
|||
|
Firmware reset |
● |
|||
|
Violation local |
● |
|||
|
Violation remote |
● |
|||