ABB CI546 3BDH000022R1 Analog module industrial system controller

Description

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The Field Termination Unit (FTU) is the section of the I/O Module that
connects all three FIUs to a single field device. The FTU primarily contains
passive components necessary for front-end signal conditioning, field signal
overvoltage protection, and EMI/RFI filtering. When installed in a Trusted
Controller or Expander Chassis, the FTU field connector interconnects to the
I/O cable assembly attached at the rear of the Chassis.
The SmartSlot link is passed from the HIU to the field connections via the
FTU. These signals go directly to the I/O cable assembly and maintain
isolation from the I/O signals on the FTU. The SmartSlot link is the intelligent
connection between Active and Standby Modules for coordination during
Module replacement.
The Field Interface Unit (FIU) is the section of the Module that contains the
specific circuits necessary to interface to the particular types of field I/O
signals. Each Module has three FIUs, one per slice. For the TMR 24 Vdc Digital
Input Module, the FIU contains an individual analog to digital (A/D) converter
for each of the 40 field inputs.
The FIU receives isolated power from the HIU for logic. The FIU provides
additional power conditioning for the operational voltages required by the
FIU circuitry. An isolated 6.25 Mbit/s serial link connects each FIU to one of
the HIU slices.
The FIU also measures a range of onboard “housekeeping” signals that assist
in monitoring the performance and operating conditions of the Module.
These signals include power supply voltages, current consumption, onboard
reference voltages and board temperature.