GE IS220YTURS1A Turbine Input/Output pack

The Mark * VIeS Functional Safety System reflects GE’ s  experience of three-plus decades, 

four generations, and over 10,000 installed Triple Modular Redundant(TMR) systems. 

The Mark VIeS is certified to IEC 61508 standards to meet the  needs of the majority of safety requirements – SIL 2 and SIL 3.

Contact Input ModuleThe Mark* VIeS Functional Safety Contact Input module provides an interface between 

discrete contact process sensors (24 discrete inputs) and Mark VIeS Safety control logic. 

The Contact Input module consists of two orderable parts: the contact input I/Opack and the contact input terminal board.

All safety contact input modules use the same I/Opack, IS420YDIAS1B.

Multiple DIN-rail mounted terminal boards are available to provide the necessary contact voltages, redundancy, and terminal block styles.

The Contact Input module is available in both Simplex and Triple Modular Redundant 

(TMR) configurations. Users can select the configuration that best addresses their needs for availability and SIL level. 

This document discusses the Simplex Contact Input (STCI) terminal board and the Contact Input (TBCI) terminal board. 

The TBCI terminal board offers TMR capability but it can also be used in a Simplex configuration with a single YDIA I/Opack. 

In a TMR I/Oconfiguration, the controller performs 2-out-of-3 voting on the discrete inputs. 

In a Dual I/Oconfiguration, the controllers listen to the first reporting YDIA I/Opack (no voting).

The Ethernet backbone of the Mark VIeS Functional Safety System allows each segment of the system to be configured with different levels of redundancy as follows:

• Can be: Simplex, Dual, or TMR

• I/Onetwork (IONet) communications can be: Simplex, Dual, or TMR

• I/O modules can be: Simplex or TMR This flexibility enables customers to design 

their system to meet the exact needs of their SIL application requirements, and ultimately reducing system costs. 

Customers can customize the level of redundancy to meet safety and running reliability needs.