ABB S800 I/O - System Structure Overview

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The following is a list of terms associated with S800 that you should be familiar
with.
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AF 100 Advant Fieldbus 100 is the communications bus
between the I/O stations and the Advant Controllers.
(FCI to CI52x)
FCI The Fieldbus Communication Interface (FCI) device
contains the interface to the fieldbus (e.g. AF 100),
ModuleBus interface and power regulators. The FCI
module can manage 24 I/O devices (up to 12 directly
and to the others in 1 to 7 I/O clusters).
Base cluster Advant Fieldbus 100 is the communications bus
between the I/O stations and the Advant Controllers.
(FCI to CI52x)
I/O cluster An extension of the I/O Station’s ModuleBus connected
to the FCI by fiber optic connections. Up to 12 I/O
devices per cluster.
I/O device A complete I/O device consists of one MTU and one I/O
module.
I/O module Is the active, electronic and signal conditioning part of an
I/O device.
I/O station An I/O station consists of one or two FCI(s), 1-7 I/O
clusters and up to 24 I/O devices.
ModuleBus Is an incremental, electrical or optical, bus for
interconnection of I/O devices.
(ModuleBus) Extension
cable
Is used when extending the electrical ModuleBus (within
the max. 2 meters).
MTU The Module Termination Unit is a passive base unit
containing process terminals and a part of the
ModuleBus.