Redundancy Behavior; B.6.3 Redundancy Behavior - ABB Ability 800xA Series User Manual

B Technical Reference
B.6 Redundancy
Take Over of Primary Role
The secondary device takes over the primary role
if
and
and
Restoring Redundancy
Only one of the listed faults may be present at a time. Another fault cannot be tolerated
until the redundant set has been repaired and a fully operational secondary device is
available.
The required measures for repairing the redundant set of devices depend on the present
fault. For an overview refer to
Table B.1: Measures for Repairing a Redundant Set of Devices
Permanent fault within the Linking Device
Transient fault within the Linking Device
Loss of the serial connection between the
two Linking Devices
Loss of the Ethernet connection between
the two Linking Devices
Loss of an H1 connection between the
primary device and the entire H1 link
B.6.3

Redundancy Behavior

Table B.2
to get a correct understanding of what fault conditions can be covered and how the
system recovers from such fault conditions.
2PAA114135-610
The serial connection to the primary device is lost.
It acts as Link Active Scheduler on all configured H1 links.
Its Ethernet port is operational.
Table
Fault
provides detailed information on the redundancy behavior. This may be useful
B.1.
Measure of Repair
Replacement of the defective Linking
Device.
Restart of the Linking Device (performed
automatically).
Re-establishment of the serial connection.
Re-establishment of the Ethernet
connection.
Re-establishment of the H1 connection.
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