ABB CI546 3BSE012545R1 Analog module industrial system controller

Description

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The HIU is the point of access to the Inter Module Bus (IMB) for the Module.
It also provides power distribution and local programmable processing
power. The HIU is the only section of the I/O Module to directly connect to the
IMB Backplane. The HIU is common to most Trusted I/O types and has type
dependent and product range common functions. Each HIU contains three
independent slices, commonly referred to as A, B, and C.
All interconnections between the three slices incorporate isolation to prevent
any fault interaction between the slices. Each slice is considered a Fault
Containment Region (FCR), as a fault on one slice has no effect on the
operation of the other slices.
The HIU provides the following services common to the modules in the
family:
• High Speed Fault Tolerant Communications with the TMR Processor
via the IMB interface.
• FCR Interconnect Bus between slices to vote incoming IMB data and
distribute outgoing I/O Module data to the IMB.
• Optically isolated serial data interface to the FIU slices.
• Redundant power sharing of dual 24 Vdc chassis supply voltage and
power regulation for logic power to HIU circuitry.
• Magnetically isolated power to the FIU slices.
• Serial data interface to the FPU for Module status LEDs.
• SmartSlot link between active and standby modules for coordination
during Module replacement.
• Digital Signal Processing to perform local data reduction and selfdiagnostics.
• Local memory resources for storing Module operation, configuration,
and field I/O data.
• Onboard housekeeping, which monitors reference voltages, current
consumption and board temperature.
The Front Panel Unit (FPU) comprises a Front Panel Termination Unit (FPTU)
and a Front Panel Display Unit (FPDU). The overall FPU contains the
necessary connectors, switches, logic, and LED indicators for the Front Panel.
For every type of Trusted I/O Module, the FPU contains the Slice Healthy,
Active/Standby and Educated indicators (LEDs), and the module removal
switches. Additional bicolor LEDs provide status indication for the individual
I/O signals. Serial data interfaces connect the FPU to each of the HIU slices to
control the LED status indicators and monitor the module removal switches.
The Module determines the contact state and line fault status by comparing
the input voltage level to four user programmed thresholds and two fixed
(minimum and maximum) thresholds. A “Contact Indeterminate” region is
defined between the contact Closed and Open states to account for marginal