Product overview

The Trusted® TMR 24 Vdc Digital Input module interfaces to 40 field input

devices. Fault tolerance is achieved through a Triple Modular Redundant

(TMR) architecture within the module for each of the 40 input channels.

Each field input is triplicated and the input voltage is measured using a

sigma-delta input circuit. The resulting field voltage measurement is

compared to user configurable threshold voltages to determine the reported

field input state. When a line-monitoring device is installed at the field switch,

the module can detect open and short circuit field cables. Line monitoring

functions are independently configured for each input channel. The

triplicated voltage measurement, coupled with onboard diagnostic testing,

provides comprehensive fault detection and tolerance.

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.