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Rockwell Automation T8831 Trusted 40 Channel Analogue Input FTA Non Incentive User Manual

Sds-8831, Trusted, Industrial control system trusted

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SDS-8831

Trusted

TM

Industrial Control System

Trusted

TM

40 Channel Analogue Input FTA Non Incendive – T8831

Issue 5 Jan 2006

ASSEMBLY

DESCRIPTION


The 40-channel T8831 Trusted

TM

Field

Termination Assembly (FTA) is the primary
interface between the Trusted

TM

TMR Analog

Input module and the field device (wiring) loop.
The model T8831 is designed for use in non-
incendive applications. The FTA is supplied
with both 150

loop current and 250

dropping resistors.

The FTA is made up of several components:
the interface cable connector and hood lock,
loop power distribution, dropping resistors, and
field input terminations.

To reduce integration time, the interface cable
which connects the FTA and its I/O module is
pre-assembled and fitted with a pair of
specialized hoods. These hoods are used to
secure the cable in place. The FTA hood fits

into the metal slot retainer shown in the
illustration at left.

To facilitate the need for on-line
replacement of an unhealthy I/O
module, the interface cable is designed
to provide the user with two different
methods for on-line maintenance. The
first method involves the use of a dual
connector hood. The dual connectors
allocate an adjacent slot in the
Trusted

TM

chassis for a hot-replacement

module. Refer to Figure 1 below for
more details regarding a dedicated
spare slot approach.

The second method of hot replacement
uses a “one-to-many” approach. This
feature is called the SmartSlot Link
(SSL). The SSL furnishes the method
to use a single I/O module slot as a hot
replacement slot. This configuration
reduces I/O chassis space by using a
single slot for hot replacement of all
modules of that type. In this case the I/O
cable has a second socket on the back
of the module end for connecting a
cable to the hot replacement slot.

Figure 1

FEATURES

40 TMR input points
per module

Easy to mount and
replace

Industry standard
field device
connections

Standard DIN rail
compatibility

Loop current
limiting and
dropping resistors
pre-installed

Small physical size

Low cost

On-board LED for
loop power integrity
indication

Interface

Cable

F

ie

ld

D

ev

ic

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Dual Hood

P

rim

ar

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ot

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FTA

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Educ ate

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