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Rockwell Automation T8423 Trusted TMR 35 - 120 Vdc Digital Input Module User Manual

Introduction, Trusted, Pd-t8423

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Trusted

TM

PD-T8423

Issue 15 Apr 10

PD-T8423

1

Trusted

TM

TMR 35 – 120 Vdc Digital Input

Module – 40 Channel

Introduction

The Trusted

TM

TMR 120V dc Digital Input module interfaces to 40 field input devices. Fault tolerance

is achieved through a Triple Modular Redundant (TMR) architecture within the module for each of the
40 input channels.

Each field input is triplicated and the input voltage is measured using a sigma-delta input circuit. The
resulting field voltage measurement is compared to user configurable threshold voltages to determine
the reported field input state. When a line-monitoring device is installed at the field switch, the module
can detect open and short-circuit field cables. Line monitoring functions are independently configured
for each input channel. The triplicated voltage measurement, coupled with on-board diagnostic testing,
provides comprehensive fault detection and tolerance.

The module provides on-board Sequence of Events (SOE) reporting with a resolution of 1ms. A
change of state triggers an SOE entry. States are determined by voltage thresholds that can be
configured on a per channel basis.

Features

• 40 Triple Modular Redundant (TMR) input channels per module.
• Comprehensive, automatic diagnostics and self-test.
• Selectable line monitoring per channel to detect open circuit and short circuit field wiring

faults.

• 2500V dc optical isolation barrier.
• On-board Sequence of Events (SOE) reporting with 1ms resolution.
• Module can be hot-replaced on-line using dedicated Companion (adjacent) Slot or

SmartSlot (one spare slot for many modules) configurations.

• Front panel input status LEDs for each channel indicate input status and field wiring faults.
• Front panel module status LEDs indicate module health and operational mode (Active,

Standby, Educated)

• T

5

V Certified IEC 61508 SIL 3