
Trusted
TM
Module T8402
Issue 13 April 10 PD-T8402 8
1. Description
The Trusted
T
M
Dual 24V dc Digital Input module is a member of the Trusted
T
M
range of Input/Output
(I/O) modules. All Trusted
TM
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 Trusted
T
M
TMR Processor. In addition, all modules have a field interface that
is used to connect to module specific signals in the field.
Figure 1 Module Architecture
All Trusted
TM
I/O modules comprise four sections: Host Interface Unit (HIU), the Field Interface Unit
(FIU), the Field Termination Unit (FTU) and the Front Panel Unit (or FPU).
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