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.