ABB UFC092BE01 HIEE300910R0001 Programmable Input Module
The ABB Triguard SC300E TMRproduct has a fully triplicated system
architecture from input module to
output module. Each system
comprises one or more identical
chassis housing the power supplies,
processors, I/O and communications
modules as required by the
application.
Each processor correlates and
corrects its memory image of the
current state of the system using a
software vote, logging any
discrepancies in the diagnostic table.
Each processor then executes its
programmed application logic and
sets its respective outputs to the
required state.
of the customer application.
Extension chassis are always
complete with two power supply
units and three bus extender
modules.
• A Remote Master Chassis
Always equipped with two power
supply units and three fibre optic

A single system may be as small as
one chassis or as large as 15, giving a
maximum of 9,500 I/O.
The system is designed to achieve the
highest possible reliability, safety and
availability and still provide economic
advantage. System availabilities in
excess of 99.999% can readily be
realised, maximising the potential
uptime for a customers process plant.
All SC300E input and output modules
interface to three isolated I/O
communication buses, each being
controlled by one of the three
processor modules.
Field input signals are filtered and
split, via isolating circuits on the input
modules, into three identical signal
processing paths. Each path is
controlled by a micro-controller to coordinate processing, testing and status
reporting to the respective processor.
Each processor communicates with
its two neighbours via isolated, read
only, high speed links to
synchronise input, output and
diagnostic status information at least
once every scan.