ABB S800 I/O User Manual page 112

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Normally communications modules can't be exchanged on-line, the only exception
is the CI820 in a redundant configuration.
It is important to understand the consequences of a module exchange and how it
affects the process.
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Replacement of a communication module type CI810/CI830 or a CI820 in a
single configuration affects all channels on all the modules in an I/O station.
The station will loose power.
Replacement of a single communication module type CI820 in a redundant
configuration has no affects on channels in an I/O station.
Replacement of a communication module type TB810/TB811 affects all
channels on all the modules in all clusters except cluster 0. The communication
will be broken to all clusters except for cluster 0.
Replacement of a communication module type TB815 affects all channels on
all the modules in an I/O station. The station will loose power.
Replacement of a communication module type TB820, connected via a
simplex optical cable, affects all channels on all the modules in all clusters
except cluster 0. The communication will be broken to all clusters except for
cluster 0. The cluster where the TB820 should be replaced will be power less.
Replacement of a communication module type TB820, connected via a duplex
optical cable, affects all channels on all the modules in all clusters after and
including the cluster where the replaced TB820 is located. The communication
will be broken to all clusters after where the replaced TB820 is located.
The cluster where TB820 should be replaced will be power less.
3BSE 020 923R101