REDUNDANCY
HANDLING OF REDUNDANCY FAULTS
1TGC908004
33
6.3.
Handling of redundancy faults
Both Digital Gateway
always supervise the redundancy conditions, detecting faults and prob-
lems according following table:
Event
Action
PLC or DCS connection interrupted for more
than 1 second to Primary Digital Gateway
Redundancy change over if backup Digital
Gateway
has an active PLC or DCS connec-
tion
Power loss or internal error of Primary Digi-
tal Gateway
Redundancy change over,
Redundancy error indi-
cated
Power loss of backup Digital Gateway
No change over, Redun-
dancy error indicated
Problems in redundancy setup
No change over possible,
Redundancy error indi-
cated
Switchgear Bus at Primary Digital Gateway
disconnected
Redundancy change over
Table 10 Primary and Backup IP address setting
A change over from Primary to Backup Digital Gateway
will only be performed
if there is no redundancy error.
Nevertheless, it is also possible that the DCS/PLC initiates a change over by
sending respective change over command. It needs to be ensured that the
switch over commands are configured in Digital Gateway
mapping for the
respective fieldbus.
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