ABB Ability 800xA Series User Manual page 109

B Technical Reference
B.6 Redundancy
Table B.2: Redundancy Behavior
Fault Condition
1 Primary device
fails due to
• permanent
hardware fault
• transient
hardware fault
• software fault
2 Ethernet cable
broken between
primary device and
Ethernet
hub/switch.
3 H1 cable broken
between primary
device and H1
network.
2PAA114135-610
Fault Detection
Device fails completely or
software watchdog expires
or
hardware watchdog
expires or
exception occurs or
failure in H1 interface
detected.
Bad link status of Ethernet
port detected.
Detection time less than
500 ms.
Empty live list detected on
one H1 port of primary
device while secondary
device still has non-empty
live list. Due to the H1
protocol, it may take some
seconds until the live list
becomes empty. Detection
occurs only if in primary
device and secondary
device the number of
active H1 devices in the
live list has exceeded the
threshold of one.
Fault
Effect
Treatment
Primary role Redundancy
actively switch-over.
transferred to System
or taken by degrades to
redundant non-redundant
device. system.
Primary role Redundancy
actively switch-over.
transferred to System
redundant degrades to
device. non-redundant
system.
Primary role Redundancy
actively switch-over.
transferred to No
redundant redundancy
device, so that concerning
access to H1 the affected
is possible H1 link.
again.
Repair Measures
Transient fault:
Automatic reboot
Permanent fault:
Replace device
secondary device
will reboot and
receive
configuration data
from primary device.
Repair or reconnect
Ethernet cable.
Secondary device
will reboot and
receive
configuration data
from primary device.
Repair or reconnect
H1 cable.
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