GE IC698CHS009
The GE IC698CHS009 is a TBCI (Contact Input with Group Isolation) terminal board for the GE Mark VI / Mark VIe turbine control platform . It provides the interface between field dry-contact signals and the turbine control system. GE documentation describes TBCI as a 24-channel contact-input terminal board supporting simplex, dual, and TMR architectures.
Core Functions
24-channel discrete/contact inputs Accepts dry contacts, switches, and relay contacts
Provides excitation power for field contacts
Group isolation helps separate field input groups and improve system availability
Incorporates input filtering/noise suppression for industrial environments
Can be used in Simplex, Dual, or TMR configurations.
Key Parameters
Item
Specification
Manufacturer
GE / General Electric
Part Number
IC698CHS009
Functional Type
TBCI Contact Input Terminal Board
System
GE Mark VI / Mark VIe
Input Channels
24 digital/contact inputs
Input Type
Dry contact
Excitation
125 VDC nominal
Excitation Range
100–145 VDC , floating
Terminal Blocks
2 barrier-type terminal blocks
Redundancy
Simplex / Dual / TMR
I/O Interface
Compatible with GE I/O interface architecture
Board Revision
CCD
The 125 VDC floating excitation specification is consistent with GE’s TBCI documentation for the 125-VDC version.
Design Features
The board is essentially a field termination and signal-conditioning interface , rather than a standalone CPU or intelligent controller. Field wiring is landed on the terminal blocks, while the board routes the contact signals toward the Mark VI control/I/O electronics.
The TBCI architecture uses noise-suppression circuitry to reduce the effects of electrical transients and high-frequency interference on contact inputs.
Hardware Composition
Typical hardware includes:
Dual barrier-type field terminal blocks
24 contact-input circuits
DC contact-excitation circuitry
Input filtering/noise suppression
Group-isolation circuitry
Multiple high-density connectors for connection to the control/I/O system
The IC698CHS009 should not be confused with the similarly named TBCIH/TBCIS variants; GE has multiple TBCI versions differentiated by excitation voltage, system generation, and revision.
Typical Applications
This board is particularly suitable for discrete status monitoring in:
Gas turbine control systems
Steam turbine control
Generator auxiliary systems
Compressor control
Power-plant balance-of-plant systems
Emergency/trip and interlock status monitoring
Typical field signals include valve limit switches, breaker status, permissive contacts, relay contacts, pressure-switch status, and other binary process indications .
Maintenance Considerations
Verify excitation voltage before connecting field wiring; the 125-VDC version is not interchangeable with 24/48-VDC variants.Inspect terminal blocks for loose connections, oxidation, and overheating.
Check for damaged connectors and PCB contamination.
When troubleshooting a missing input, check the field contact, excitation supply, terminal wiring, and downstream I/O interface in sequence.
For TMR systems, verify all redundant paths rather than replacing the board based on a single channel fault.
Confirm the exact revision suffix before replacement because mechanically similar TBCI boards are not necessarily electrically interchangeable.
Overall Evaluation
The IC698CHS009 is a 24-channel, 125-VDC contact-input terminal/interface board intended for GE Speedtronic turbine-control applications. Its main value is reliable, isolated acquisition of large numbers of discrete field signals while supporting redundant turbine-control architectures. It is an interface/termination board, not a PLC CPU or standalone I/O processor .
Important: Some third-party listings contain inconsistent descriptions of this part number. GE’s own documentation confirms the TBCI family and its 24-channel contact-input architecture, so the exact nameplate/revision and system generation should be checked before substitution .
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