Operation of the DP/PA Link and the Y Link
8-6
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
8.3 Behavior following specific events in redundant
operation
The table below shows the behavior of the IM 157 following specific events in
redundant operation.
Table 8-2 Behavior following specific events in redundant operation
Event
Reaction
Master-reserve switchover with a changed
configuration
The link is switched over in a bumpless
manner from the active channel to the
channel that has up to now been passive.
Failure of a CPU If this also causes the active channel of the
redundant DP master system to fail: see
Failure of the active channel.
Otherwise: see Failure of the passive
channel.
Failure of the active channel The link is switched over in a bumpless
manner from the active channel to the
channel that has up to now been passive.
The failed channel is indicated on the
corresponding IM 157 by the “BF 1” LED.
Failure of the passive channel No consequences for the link.
The failed channel is indicated on the
corresponding IM 157 by the “BF 1” LED.
Failure of an IM 157 A diagnostic message is generated in the
system.
If the active IM 157 fails, the link is switched
over in a bumpless manner to the channel
that has up to now been passive.
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