ABB S800 I/O Manual page 24

Product Scope
The FCI communicates with the PROFIBUS Master, ModuleBus Modems and the
I/O modules. The FCI handles the I/O-modules operations such as read and write
data, read status and configuration of modules and channels. The FCI has a
connection to the TB842 Optical ModuleBus Port.
The FCI provides 24 V d.c. (from the source) and an isolated 5 V d.c. power to the
base cluster's I/O modules (12 maximum or 6 pairs) by way of the ModuleBus
connections. One power source (single or redundant 24 V d.c.) can be connected to
the power terminals (L+ & L-) of the MTU.
1:1 redundant power sources can be supervised by connecting the power sources
POWER OK status signals to terminals SA and SB.
The size, type and direction of data to be transferred on the PROFIBUS-DPV1 bus
depends on and is determined by the I/O module type. The FCI can be configured to
send or transmit dynamic data over the PROFIBUS-DPV1 with cycle times in the
interval from 1 ms.
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Section 1 Introduction
3BSE020926-600