whether a Series 8 FIM module is installed in a non-redundant or redundant IOTA.
Redundant IOTA
Redundant Series 8 FIM modules are installed on a redundant Series 8 FIM IOTA. A redundant
Series 8 FIM IOTA contains only one set of switches in which to set the Device Index. The
Device Index switches on a redundant Series 8 FIM IOTA must be set to an odd number. This
will assign the odd number Device Index to the Series 8 FIM module installed in the upper
connector and an even Device Index (primary Device Index plus 1) to the secondary Series 8
FIM module. Note that Device Indexes for the Primary and secondary Series 8 FIM blocks must
be configured accordingly.
A Series 8 FIM module installed in the upper connector of a redundant IOTA can be
configured as non- redundant, which allows for future re-configuration to add
redundancy. However, a Series 8 FIM module installed in the lower connector of a
redundant IOTA cannot be configured as non-redundant.
A redundant Series 8 FIM IOTA shares a single connection to its H1 segments. It is not valid
to configure two non-redundant Series 8 FIM modules on the same redundant IOTA.
See the Series 8 Fieldbus Interface Module User's Guide for details on Series 8 FIM
configuration.
8.3
Partner (controller) compatibility
Controller redundancy is only possible when the primary controller has a compatible
secondary partner. Once the redundancy private path cable is connected to a running
partner, the primary controller periodically sends a partner compatibility message that
contains information necessary to perform the compatibility check, and the secondary
responds with its own compatibility message. Each module compares local information
against the supplied remote values to determine whether the partner module is
compatible or incompatible. If all of the compatibility criteria are satisfied, then the
partner module is compatible. Otherwise, if any of the compatibility criteria are not met,
then the partner module is incompatible and synchronization is not permitted. The
following criteria are compared:
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