GE IS200T Series Modules IS200TBAIS1C Analog I/O Terminal Board

Technical Dossier

Product Details And Specifications

GE IS200T Series Technical Notes

The GE IS200T series constitutes the terminal board layer of GE's Mark VI and EX2100 turbine control systems — platforms deployed across heavy industrial sectors including petrochemical refineries, nuclear power stations, combined-cycle gas turbine plants, and offshore oil & gas facilities. These terminal boards serve as the physical interface between field instrumentation (thermocouples, RTDs, pressure transmitters, servo actuators) and the Mark VI I/O processor modules. The IS200T series is not a standalone controller family; it operates in conjunction with IS200S-series I/O packs and IS215-series VME processor boards, forming a layered architecture that defines GE's Speedtronic control philosophy. Global installed base estimates place Mark VI systems in operation at thousands of turbine units worldwide, making IS200T terminal boards among the most frequently sourced industrial spare parts in the power generation sector.

The Evolution of IS200T Architecture

The IS200T terminal board series was introduced alongside the Mark VI control system in the mid-1990s as GE's successor to the Mark V (IS200-series predecessor boards used a different connector and backplane standard). The Mark VI architecture introduced a distributed I/O topology using JR45 ribbon connectors and a dedicated I/O LAN (IONet), replacing the earlier parallel backplane bus of Mark V. IS200T boards are passive or semi-passive: they carry no onboard firmware but route analog and digital signals through precision resistor networks, isolation transformers, and terminal blocks to the mating I/O pack.

IS200T Full Catalog & Functionalities (SKU List)

Analog I/O Terminal Boards

• IS200TBAIS1C: Analog input terminal board; 16-ch thermocouple/mV input interface for Mark VI I/O pack
• IS200TBAIS1A: Analog input terminal board, revision A; earlier hardware revision of TBAIS1C
• IS200TBAIS1B: Analog input terminal board, revision B; intermediate hardware revision
• IS200TBAOS1A: Analog output terminal board; interfaces 4–20 mA current loop outputs to field actuators
• IS200TBAOS1B: Analog output terminal board, revision B; updated output drive circuitry
• IS200TBCAS1A: Combined analog I/O terminal board; mixed input/output channel configuration

Digital I/O Terminal Boards

• IS200TBDIS1A: Digital input terminal board; 24 VDC discrete input interface, 32-channel capacity
• IS200TBDOS1A: Digital output terminal board; relay-driven discrete output interface for solenoids/contactors
• IS200TBDOS1B: Digital output terminal board, revision B; enhanced relay contact rating
• IS200TBCIS1A: Contact input terminal board; dry-contact and wet-contact discrete input interface
• IS200TBCIS1B: Contact input terminal board, revision B; updated input filter network

Speed/Pulse & Servo Terminal Boards

• IS200TSVOH1A: Servo output terminal board; interfaces electrohydraulic servo valve (EHSV) control signals
• IS200TSVOH1B: Servo output terminal board, revision B; updated current drive stage
• IS200TBCCH1A: Speed/pulse input terminal board; magnetic pickup (MPU) and proximity probe interface
• IS200TBCCH1B: Speed/pulse input terminal board, revision B; improved EMI filtering on MPU inputs

Communication & Power Interface Boards

• IS200TPROH1A: Power supply interface terminal board; routes 28 VDC and 5 VDC rails to I/O pack connectors
• IS200TPROH1B: Power supply interface terminal board, revision B; updated fusing and protection circuitry
• IS200TBCAS1B: Combined analog terminal board, revision B; field wiring terminal block upgrade