ICS TRIPLEX T8451 Trusted TMR 24 Vdc Digital Output Module – 40 Channel

Product Overview

The Trusted® TMR 24 Vdc Digital Output Module interfaces to 40 field

devices. Triplicated diagnostic tests are performed throughout the Module

including measurements for current, and voltage on each portion of the voted

output channel. Tests are also performed for stuck on and stuck off failures.

Fault tolerance is achieved through a Triple Modular Redundant (TMR)

architecture within the Module for each of the 40 output channels.

Automatic line monitoring of the field device is provided. This feature enables

the Module to detect both open and short circuit failures in field wiring and

load devices.

The Module provides onboard Sequence of Events (SOE) reporting with a

resolution of 1 ms. An output change of state triggers an SOE entry. Output

states are automatically determined by voltage and current measurements

onboard the Module.

This Module is not approved for direct connection to hazardous areas and

should be used in conjunction with Intrinsic Safety Barrier devices.

Features

• 40 Triple Modular Redundant (TMR) output points per Module.

• Comprehensive, automatic diagnostics and self-test.

• Automatic line monitoring per point to detect open circuit and short

circuit field wiring and load faults.

• 2500V impulse withstand opto/galvanic isolation barrier.

• Automatic overcurrent protection (per channel), no external fuses

required.

• Onboard Sequence of Events (SOE) reporting with 1 ms resolution.

• Module can be hot-replaced online using dedicated Companion

(adjacent) Slot or SmartSlot (one spare slot for many Modules)

configurations.

• Front Panel output status light-emitting diodes (LEDs) for each point

indicate output status and field wiring faults.

• Front Panel Module status LEDs indicate Module health and

operational mode (Active, Standby, Educated).

• TϋV Certified IEC 61508 SIL 3.

• Outputs are powered in isolated groups of eight. Each such group is a

Power Group (PG).

Description

The TMR 24 Vdc Digital Output Module is a member of the Trusted range of

input/output (I/O) Modules. All Trusted I/O Modules share common

functionality and form. At the most general level, all I/O Modules interface to

the Inter-Module Bus (IMB) which provides power and allows communication

with the TMR Processor. In addition, all Modules have a field interface that is

used to connect to Module-specific signals in the field. All Modules are Triple

Modular Redundant (TMR).

All High Integrity I/O Modules are made up of four sections: Host Interface

Unit (HIU), the Field Interface Unit (FIU), the Field Termination Unit (FTU),

and the Front Panel Unit (or FPU).

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,

overvoltage 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 coordination during

Module replacement.

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 24 Vdc Digital

Output Module, the FIU contains one stage of the output switch structure,

and sigma-delta (ΣΔ) output circuit for each of the 40 field outputs. Two

additional ΣΔ 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 6.25 Mbit/sec serial link connects each FIU to one of

the HIU slices.

The FIU also measures a range of onboard "housekeeping" signals that assist