GE SPEEDTRONIC IC3600SIXJ1C1B Modules

Technical Dossier

Product Details And Specifications

GE SPEEDTRONIC Series Technical Notes

The GE SPEEDTRONIC turbine control system is one of the most widely deployed gas and steam turbine control platforms in global heavy industry. Installed across petrochemical complexes, nuclear power stations, offshore platforms, and oil refineries, the SPEEDTRONIC architecture has governed turbine sequencing, protection, and load control for decades. The IC3600 module family — the hardware backbone of the Mark I through Mark IV generations — remains in active service at thousands of sites worldwide. The IC3600SIXJ1C1B is a signal conditioning and interface printed circuit board within this ecosystem, responsible for analog signal processing between field instrumentation and the turbine control logic.

The Evolution of SPEEDTRONIC Architecture

GE's SPEEDTRONIC turbine control platform evolved through six major generations, each introducing new hardware standards while maintaining backward compatibility requirements that created long-term demand for legacy IC3600 boards.

Mark I / Mark II (1960s–1970s): Relay-based and early solid-state logic. Discrete analog boards handled all signal conditioning. The IC3600 prefix was established during this era as the standard module numbering convention.

Mark III (late 1970s–1980s): Introduced redundant TMR (Triple Modular Redundancy) architecture. The IC3600 board family expanded significantly to support voting logic, analog I/O, and communication functions. Boards such as the IC3600SIXJ1C1B were designed for this generation's signal interface requirements.

Mark IV (1980s–1990s): Microprocessor-based control with enhanced diagnostics. Many IC3600-series boards remained compatible and were carried forward. Cross-generation compatibility made the IC3600 catalog a long-lived spare parts requirement.

Mark V (1990s–2000s): Full digital TMR architecture. GE introduced new board families (DS200, IS200 series), but Mark III/IV installations continued to require IC3600 spares for maintenance and life extension programs.

Mark VI / Mark VIe (2000s–present): Ethernet-based distributed I/O. Legacy IC3600 boards are no longer manufactured by GE but remain essential for sites that have not completed migration programs. The IC3600 series is now firmly in the obsolete/end-of-life category, making third-party sourcing the primary supply channel.

SPEEDTRONIC Full Catalog & Functionalities (SKU List)

The following IC3600-series modules represent the core spare parts catalog for SPEEDTRONIC Mark III and Mark IV turbine control systems. Each entry reflects a distinct functional role within the control architecture.

IC3600SIXJ1C1B: Signal interface PCB for analog I/O conditioning and field signal termination.
IC3600AFAA1A: Analog input board; processes 4–20 mA and thermocouple signals from field sensors.
IC3600AFAA1B: Revised analog input board with enhanced noise filtering for high-EMI environments.
IC3600EPBA1A: Power supply board; provides regulated DC voltages to backplane-mounted modules.
IC3600EPBA1B: Updated power supply board with improved thermal management and overcurrent protection.
IC3600LSBA1A: Logic sequencing board; executes turbine start/stop and load sequencing programs.
IC3600LSBA1B: Revised logic sequencing board with expanded memory for complex sequencing routines.
IC3600SRBA1A: Speed reference board; generates and conditions speed setpoint signals for governor control.
IC3600TBBA1A: Terminal board; provides field wiring termination points for I/O modules.
IC3600TBBA1B: Extended terminal board with additional termination capacity for high-density I/O configurations.
IC3600CONA1A: Controller board; central processing unit for Mark III TMR voting and control logic.
IC3600CONA1B: Updated controller board with enhanced diagnostic self-test routines.
IC3600DIBA1A: Digital input board; accepts 24 VDC discrete signals from field switches and contacts.
IC3600DOBA1A: Digital output board; drives relay and solid-state outputs to field actuators and solenoids.
IC3600COMM1A: Communication interface board; supports serial data exchange between control panels and HMI systems.
IC3600VSCB1A: Vibration signal conditioning board; processes proximity probe and accelerometer signals for machinery protection.
IC3600TPSA1A: Temperature protection and signal board; monitors exhaust and bearing temperature arrays.

Sourcing Hard-to-Find & Obsolete SPEEDTRONIC Parts

GE ceased production of the IC3600 module series following the commercial release of the Mark VI platform. As of 2026, no new IC3600-series boards are available through OEM channels. The global installed base of Mark III and Mark IV systems, however, remains substantial — particularly in regions where turbine upgrade programs have been deferred due to capital constraints or operational continuity requirements.

Quality Control for the SPEEDTRONIC IC3600 Range

IC3600-series boards present specific test challenges due to their mixed analog/digital architecture, backplane bus dependencies, and age-related component degradation. DriveKNMS applies the following verification protocol to all IC3600 modules:

Visual Inspection: Full board examination for capacitor bulge, PCB delamination, solder joint cracking, and corrosion on edge connectors. Boards with physical damage to the backplane interface are rejected at intake.

Component-Level Testing: Critical passive and active components — including op-amps, voltage regulators, and isolation amplifiers — are tested in-circuit using precision measurement equipment before power-on.

Functional Bench Test: Each board is installed in a SPEEDTRONIC-compatible test rack and exercised through its full I/O range. Signal conditioning boards such as the IC3600SIXJ1C1B are tested with calibrated analog inputs to verify output linearity and noise performance.

Backplane Communication Verification: Boards are tested for correct bus arbitration and data integrity under simulated load conditions representative of Mark III TMR voting architecture.