Rockwell Automation T8423 Trusted TMR 35 - 120 Vdc Digital Input Module - Manual (Page 9)

Trusted
TM
Module T8423
Issue 15 Apr 10 PD-T8423 9
Figure 2 shows a simplified functional block diagram of the Trusted TM 120Vdc Digital input module.
Figure 2 Functional Block Diagram
1.1. 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 interface. The FTU primarily contains passive components necessary for front-end signal
conditioning, field signal over-voltage protection, and EMI/RFI filtering. When installed in a Trusted
TM
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 co-ordination
during module replacement.