Invensys Triconex 3604E TMR Digital Output Module

Invensys Triconex 3604E TMR Digital Output Module

Functional Description

The 3604E TMR digital output (DO) module receives output signals from the main processors on each of

three channels. Each set of three signals is then voted by special quadruplicated output circuitry on the

module. The circuitry produces one voted output signal and passes it to the field termination. The

quadruplicated voter circuitry provides multiple redundancy for all critical signal paths, guaranteeing safety

and maximum availability.

Each 3604E TMR digital output module has a voltage-loopback circuit which verifies the operation of each

output switch independently of the presence of a load and determines whether latent faults exist. Failure of

the detected field voltage to match the commanded state of the output point activates the LOAD/FUSE

alarm indicator.

Technical Specifications