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TECHNICAL SPECIFICATIONS:
Part Number: IS230TBCIH3C
Manufacturer: General Electric
Series: Mark VIe
Functional Acronym: TBCI
Product Type: Discrete Contact Input Terminal Board
Hardware Revision: REV C
Number of Channels: 24 contact voltage
Redundancy Configuration: Simplex (DIN-rail mount module)
I/O Pack Interface: One DC-62 pin connector matching a single PDIA pack
Terminal Blocks: Two rows of 24-point pluggable barrier strips
Contact Channels: 24 dry contact inputs
Excitation Voltage: 48 V DC nominal tracking
Circuit Board Protection: High-grade Conformal PCB Coating
Ambient Operating Temperature: -30�C to +65�C (-22�F to +149�F)
Repair Lead Time: 3-5 Business Days
Availability: In Stock / Repair & Exchange Available
Country of Origin: United States
Manual: GEH-6721_Vol_II_BL
The IS230TBCIH3C is a Simplex Contact Input with Group Isolation Terminal Board manufactured by General Electric for the Distributed Mark VIe controller infrastructure. The Contact Input with Group Isolation (TBCI) terminal board accepts 24 dry contact inputs wired to two barrier-type terminal blocks. For contact excitation, the power is wired to TBCI. The contact inputs have noise suppression circuitry to protect against surges and high-frequency noise.
TBCI INSTALLATION:
Connect the wires for the 24 dry contact inputs directly to two I/O terminal blocks on the terminal board. These blocks are held down with two screws and can be unplugged from the board for maintenance. Each block has 24 terminals accepting up to #12 AWG wires. A shield terminal strip attached to chassis ground is located immediately to the left of each terminal block. In a Simplex system, connect the I/O pack into the TBCI connector JR1. In a Dual system, plug the I/O packs into JR1 and JS1. In a TMR system, plug the I/O packs into JR1, JS1, and JT1. The I/O pack(s) attach to side-mounting brackets. One or two Ethernet cables plug into the I/O packs. Connect TBCI to the contact excitation voltage source using plugs JE1 and JE2.
OPERATION:
Filters reduce high-frequency noise and suppress surge on each input near the point of signal entry. The dry contact inputs on TBCIHIC and SIC are powered from a floating 125 V dc (100-140 V dc) supply from the control cabinet. The 125 V dc bus is current-limited in the power distribution module prior to feeding each contact input. The other terminal board versions use lower voltages.
INSTALLATION:
Discrete input voltage signals pass to the I/O pack, which sends them through optical isolators providing group isolation, and transfers the signals to the Mark VIe or Mark VIES controller. The reference voltage in the isolation circuits sets a transition threshold that is equal to 50% of the applied floating power supply voltage. The tracking is clamped to go no less than 13% of the nominal rated supply voltage to force all contacts to indicate open when voltage dips below this level.
A pair of terminal points is provided for each input, with one point (screw) providing the positive de source and the second point providing the return (input) to the board. The current loading is 2.5 mA per point for the first 21 inputs on each terminal board. The last three have a 10 mA load to support an interface with remote solid-state output electronics. Contact input circuitry is designed for NEMA Class G creepage and clearance.
FIELD DIGITAL SIGNAL CONDITIONING:
The primary circuit board layer manages 24 dry discrete contact inputs, transforming raw open/closed field states into reliable logic data. Incoming lines pass through dedicated input-filtering networks designed to suppress mechanical contact bounce and eliminate high-frequency electromagnetic interference (EMI) originating from adjacent power conduits. Once normalized, these digital signal states are structured and transmitted across the integrated DC-62 pin connector block directly to a mounted PDIA discrete input processing pack.
CONTACT EXCITATION & REGULATION:
To monitor passive field elements, the IS230TBCIH3C distributes an integrated, isolated 48 V DC nominal excitation voltage loop to the field contacts. This onboard wetting voltage breaks through oxide buildup on aging switch contacts to guarantee reliable state transitions. The excitation framework is split into group-isolated pathways protected by localized, self-resetting solid-state fuses, ensuring that a single crushed field conductor or short-circuit wire fault cannot collapse the power rails of the remaining functional signal channels.
SYSTEM HARDWARE DIAGNOSTICS:
The board works in continuous synchronization with the diagnostic microcode of the mated PDIA I/O pack to deliver real-time infrastructure surveillance. The system actively scans the input loops for abnormal current states, tracking line drops to report field wiring breaks or sustained ground faults immediately. This automated oversight accelerates diagnostic profiling within the ToolboxST application, alerting plant operators to plant-side field wiring anomalies before they trigger operational sequence failures.
WHY PARTNER WITH WORLD OF CONTROLS:
World of Controls provides the industry's most dependable logistics and technical infrastructure for critical turbine control networks. We maintain an extensive inventory of genuine OEM replacement parts for GE Distributed control setups, minimizing operational downtime during emergency outages. Every item, from certified unused surplus to fully rebuilt industrial components, is subjected to strict simulation profiling in our advanced electronics lab and is supplied with a comprehensive product warranty. Our global engineering support network operates 24/7 to deliver troubleshooting advice, component replacement guidance, and component testing evaluations. Contact the WOC sales team directly via phone or email for current pricing, hardware availability, or repair quotes.
What is the GE IS230TBCIH3C?
The GE IS230TBCIH3C is a Simplex Contact Input with Group Isolation Terminal Board built for the Mark VIe control series. It functions as a single-channel, DIN-rail-mounted interface module that aggregates up to 24 discrete field contact signals. By routing these filtered inputs into a singular processing pack, it delivers efficient binary status tracking for industrial turbine applications.
Why is group isolation integrated into the board excitation voltage architecture?
Group isolation protects internal control electronics by creating a 1500 V RMS electrical boundary between field wiring zones and the processing logic. This configuration confines high-voltage ground faults, line spikes, or physical short circuits to a single isolated input cluster without compromising the remaining active instrumentation tracks.
How does the board execute digital signal conditioning for noisy field environments?
The board runs incoming field signals through dedicated hardware filtering networks configured to suppress mechanical contact bounce and electromagnetic noise. This conditioning mechanism cleans up unstable signal variations caused by vibration or proximity to high-current lines before transmitting the digital state changes across the 62-pin connector link.
How to diagnose a field wiring break or ground fault using this terminal module?
Field faults are tracked through real-time loop current diagnostics driven by the board's microcode sync with the PDIA I/O pack. Technicians monitor the system via ToolboxST software to detect line drop anomalies, identifying broken field wires or crushed insulation blocks instantly.
What type of field wiring termination layout is configured on this specific module?
The board layout contains two rows of 24-point pluggable Euro-style box connector strips providing 48 terminal landing points total. This design allows maintenance personnel to swap out hardware modules rapidly by unplugging complete terminal blocks without manually removing individual field wires.
Why does the board distribute a nominal 48 V DC excitation voltage to field contacts?
The board supplies 48 V DC wetting voltage to pierce the surface oxide and film accumulation on aging mechanical switch contacts. This regular current flow ensures reliable circuit continuity and distinct binary state transitions when field contacts open or close.
