GE Mark VIeS IS400WROBH1A Contact Wetting Circuit Board

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 Module

The 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.

A proven and safe solution

GE brings decades of domain expertise to the Mark VIeS Functional Safety

System. The Mark series of controllers has earned a reputation for superior running 

reliability and superior tripping reliability when required in thousands of TMR 

systems installed in power generation and infrastructure applications globally. These 

proven philosophies are atthe heart of the Mark VIeS Functional Safety System.

Flexibility and reliability Redundancy is a critical feature in safety control system design,

enabling continuous process operation during system maintenance or repair. 

Functional Description

The Analog I/O pack (PAIC) is an electrical interface that connects one or two I/O Ethernet networks to an analog input terminal board. 

The PAIC includes a BPPx processor board as well as an acquisition board dedicated to the analog I/O function.

The module has ten analog inputs. The first eight inputs can be set to 5 V or 10 V or 4-20 mA current loop inputs. 

The final two inputs can be set to 1 mA or 4-20 mA current inputs.

The load terminal resistors for current loop inputs are located on the terminal board, and the PAIC senses voltage across these resistors. 

PAICH2 has two current loop outputs ranging from 0 to 20 mA.

 It also includes additional hardware that allows for 0-200 mA current on the first output only.

The I/O pack receives and sends data to the controller via dual RJ-45 Ethernet connectors and is powered by a three-pin connector. 

Field devices are communicated with via a DC-37 pin connector that connects directly to the associated terminal board.

LED indicator lights provide visual diagnostics.

Hardware Tips and Specifications

This pack has an internally placed BPPx processor board as well as an acquisition board that is used for thermocouple input functions.

Before even considering any ultimate purchase decision on this IS220PTCCH1A device, 

it is crucial to understand the fact that this IS220PTCCH1A device is actually not the originally-developed product of its specific Mark V Series intended functional role, 

as that would in fact be the IS220PTCCH1 parent Thermocouple Input Module noticeably not adopting this IS220PTCCH1A device's sole A-rated functional product revision. 

The IS220PTCCH1A can be used in simplex, duplex, and triple modular redundant applications.

This board can support E, J, K, S, and T standard thermocouples as well as mV inputs with a span of -8 to 45 mV.  E, J, K, S, and T thermocouples 

can be either grounded or ungrounded and can be located up to 984 feet from the turbine I/O panel.  Cable resistance must be kept to a maximum 450 Ω. 

The number of packs used dictate the following:

Qty 1 IS220PTCCH1A - 12 Thermocouple Inputs

Qty 2 IS220PTCCH1A - 24 Thermocouple Inputs

Qty 3 IS220PTCCH1A - Used in TMR Configurations