Description

T8431C Trusted TMR 24Vdc Analogue Input Module T8431

Product description

The Trusted® TMR 24 Vdc Analog Input module interfaces to 40 sourcing field input devices, acting as a current sink for all these devices. Comprehensive diagnostic tests are performed on each input channel. Fault tolerance is achieved through a Triple Modular Redundant (TMR) architecture within the Module for each of the 40 input channels.
Using the built-in line-monitoring feature, the Module can detect open and shorted field cables. Line monitoring functions are independently configured for each input channel.
The Module provides onboard Sequence of Events (SOE) reporting with a resolution of 1 ms. A change of state triggers an SOE entry. States are determined by voltage thresholds that can be configured on a per channel basis. When the field voltage and field return are connected to the auxiliary input channels of the Module, thresholds can be specified as a ratio of the field supply voltage.

The HIU is the point of access to the Inter Module Bus (IMB) for the Module.
It also provides power distribution and local programmable processing power. The HIU is the only section of the I/O Module to directly connect to the IMB Backplane. The HIU is common to most Trusted I/O Module types and has type dependent and product range common functions. Each HIU contains three independent slices, commonly referred to as A, B, and C.
All interconnections between the three slices incorporate isolation to prevent any fault interaction between the slices. Each slice is considered a Fault Containment Region (FCR), as a fault on one slice has no effect on the operation of the other slices.
The HIU provides the following services common to the Modules in the family:
• High Speed Fault Tolerant Communications with the TMR Processor via the IMB interface.
• FCR Interconnect Bus between slices to vote coming IMB data and distribute outgoing I/O Module data to the IMB.
• Optically isolated serial data interface to the FIU slices.
• Redundant power sharing of dual 24 Vdc chassis supply voltage and power regulation for logic power to HIU circuitry.
• Magnetically isolated power to the FIU slices.
• Serial data interface to the FPU for Module status LEDs.
• SmartSlot link between Active and Standby modules for coordination during Module replacement.
• Digital Signal Processing to perform local data reduction and selfdiagnostics.
• Local memory resources for storing Module operation, configuration, and field I/O data.
• Onboard housekeeping, which monitors reference voltages, current consumption and board temperature.

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Product parameter

• 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 impulse withstand opto/galvanic isolation barrier.
• 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 input status Light Emitting Diodes (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).
• TϋV Certified IEC 61508 SIL 3.

Application field

The Trusted® TMR 24 Vdc Analog Input 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 Trusted 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).

The Field Termination Unit (FTU) is the I/O Module assembly that connects all three FIUs to a field connector. The FTU primarily contains passive components necessary for front-end signal conditioning. When installed in a
Trusted Controller or Expander Chassis, the FTU field connector mates 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 I/O cable assembly 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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