T8480 Trusted TMR Analog Output Module – 40 Channel

Description

T8480 Trusted TMR Analog Output Module – 40 Channel

The Trusted® TMR Analog 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. Voltage
and current measurements onboard the Module automatically determine the
output states.
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 channels 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 for non-interfering applications, refer to the safety
manual T8094.
• Outputs are powered in isolated groups of eight. Each such group is a
Power Group (PG).

T8480

The TMR 4-20 mA Analog 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).
Figure 2 shows a simplified block diagram of the Trusted 4-20 mA Analog
Output Module

The Field Termination Unit (FTU) is the section of the I/O Module that
connects all three Field Interface Units (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.

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