Rockwell-automation T8448 Trusted TMR Zone Interface Module - 40 Chann Manual de usuario descargar pdf (Pagina 10)

Trusted

Module T8448

Issue 14 Apr 10 PD-T8448 10

lice Power

upply

ousekeeping

Failsafe Bias Control

Back Plane

ower Bus

Front Panel

TMR Intermodule Bus

Opto Isolation Boundary

Serial Display Latches

Voted Status Display LEDs

Internal Voting Bus

Housekeeping

Module Temp

upply Diag

SP reference

Health

Indicators

ack Plane Power Bus 1

Back Plane Power Bus 2

Slice A

OFIUHIU

FPDU

FPIU

Field Logic

Control

Redundant Supply

.C.

N.O.

iagnostic

onitor

Interface

Bus

nterface

Slice Power

Supply

Housekeeping

ailsafe Bias Control

Field Logic

Control

N.C.

N.O.

iagnostic

Monitor

lice Power

Supply

Housekeeping

ailsafe Bias Control

Field Logic

Control

N.C.

N.O.

iagnostic

Monitor

Bus

nterface

Front Panel

oting Logic

Slice

Control

ime Stamp

Slice

Control

ime Stamp

Slice

Control

ime Stamp

OFTU

lice B

Slice C

A B C

roup

Fail-Safe

witch

ield Interface

rotection Circuit

Figure 2 shows a simplified block diagram of the Trusted

Zone Interface Module.

Figure 2 Function 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 provides the Group Fail-safe switches and passive components

necessary for signal conditioning, over-voltage protection, and EMI/RFI filtering. When installed in a

Trusted

Controller or Expander Chassis, the FTU field connector interconnects to the Field 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 field connector 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.

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. Each module has three FIUs, one per slice. For

the TMR Zone Interface Module, the FIU contains one stage of the output switch structure, and A/D

monitoring circuits for each of the channels Two additional A/D circuits provide optional monitoring of

the external field I/O supply voltage.

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 6.25Mbit/sec serial

link connects each FIU to one of the HIU slices.

The FIU also measures a range of on-board “house-keeping” signals that assist in monitoring the

performance and operating conditions of the module. These signals include power supply voltages,

current consumption, on-board reference voltages, board temperature, and condensation.

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