Field Termination Unit (FTU)

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.