Field termination unit (ftu), Field interface unit (fiu), Trusted – Rockwell Automation T8472 Trusted TMR 120V ac Isolated Output Module User Manual

Page 7: Module t8472

Trusted

Module T8472

Issue 13 Sep 11

PD-T8472

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2500V dc
ISOLATIO

Field
Supply
Live

Field
Load

Field Supply
Return

FIU-
QA

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FIU-
QB

FIU-
QD

FIU-
QC

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TMR

(Quad Element
Switches)

TMR
SLICE

HIU

FIU

FTU

Switched
Channel
Field
Output

TMR
(Quad

TMR (Inter
Modular
Bus)

1.1. Field Termination Unit (FTU)

The Field Termination Unit (FTU) contains the circuitry for the ‘Quad Element’ Channel Switches Ch 9
to Ch 16. (Circuitry for Switches Ch1 to Ch 8 are located on the FIU.)

The FTU contains the Field Output Connector, therefore all Field Connections come from or route via
the FTU.

When installed in a Chassis, the FTU field connector accepts the Field I/O Cable Assembly attached at
the rear of the chassis.

1.2. Field Interface Unit (FIU)

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. Unlike other Trusted

I/O modules, the T8472

has four FIUs. References to OFIU refer to specifically OUTPUT Module functions. Each FIU slice
operates one switch element (QA,QB, QC or QD) in each of the 16 output channels, as shown in the
figure below:

Figure 2 FIU Architecture