ABB LD 800HSE, Manual

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Appendix C Technical Reference Redundancy Behavior
3BDD011677-600 A 119
In any case, the fully redundant state will be obtained again when the Secondary
Device indicates “operational” (refer to
Device Status Indication on page 33) and its
H1 live lists are complete. In highly populated, tightly configured H1 links it may
take several minutes to acquire the live lists. Before the live lists are completed,
redundancy switching is possible but client server connections can only be
established to H1 devices which are in the live list.
Any further error that occurs before the fully redundant state is reached may cause
the system to fail.
Table 19 , Table 20 , and Table 21 show the status indications associated with the
fault states described above. The numbers in the first column refer to Table 18 . Line
0 describes the faultless state. ‘Primary Device’ and ‘Secondary Device’ denote the
role after redundancy switch-over (therefore the states 1, 2, or 3 are transformed to
9 Redundancy link
broken or removed
between Primary
Device and Secondary
Device during start up
of the Secondary
Device. No serial communication.
Detection time less than 800
ms.
Secondary
Device starts up
as non-redundant
device and gets
duplicate address
errors on all H1
links. System
degrades to
non-redundant
system. Repair or reconnect
redundancy link.
Secondary Device will
reboot and receive
configuration data from
Primary Device.
10 The Secondary Device
does a reboot while
the TCP connection
between two
redundant linking
devices is broken and
the Primary Device
fails or is restarted
manually.
TCP connection between two
redundant linking devices is
broken. Primary Device not
available. The former
Secondary
Device becomes
the Primary
Device, but
without any
configuration. Non-configured
and therefore
non-operational
system Fix broken TCP
connection and
download the
configuration again.
(1) This fault condition may also result in a cyclic reboot of the Secondary Device.
(2) If the Secondary Device reboots cyclically in this state, set the TCP acknowledge timeout (object 22223) to a smaller
value.
Table 18. Redundancy Behavior
Fault Condition Fault Detection Fault Treatment Effect Repair Measures