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SPECIFICATIONS
Part No: IS230TBCI2CG01
Manufacturer: General Electric
Series: Mark VIe
Product Type: Contact Input with Group Isolation Terminal Board
Number of Channels: 24 contact voltage input channels
Excitation Voltage: 125 V dc
Input Current: 2.5 mA
Power Consumption: 20.6 W
Input Filter: 4ms
Mounting: DIN-Rail
Availability: In Stock
Weight: 2.00 lbs
Size: 33.02 cm high x 10.16 cm
Operation Temperature: -30 to 65 °C
Country of Origin: USA
Manual: GEH-6721_VOI_II V
FUNCTIONAL DESCRIPTION:
IS230TBCI2CG01 is a Contact Input with Group Isolation Terminal Board manufactured and designed by General Electric and is part of the Mark VIe Series used in Distributed turbine control systems. The Contact Input with Group Isolation (TBCI2CG01) terminal board is designed to accommodate 24 dry contact inputs, which are connected through two barrier-type terminal blocks for secure and organized wiring. The board receives contact excitation power directly from the TBCI2CG01, ensuring reliable operation of all connected inputs. Each input channel is equipped with built-in noise suppression circuitry, protecting against electrical surges, transient spikes, and high-frequency interference. This design enhances signal integrity, improves system reliability, and ensures accurate detection of contact closures even in electrically noisy environments.
COMPATIBILITY:
The TBCI terminal board is fully compatible with the PDIA I/O pack and is engineered to support simplex, dual, and triple-modular-redundant (TMR) configurations. Depending on system requirements, one, two, or three PDIA modules can be directly plugged into the TBCI2CG01 board without the need for additional adapters or modifications. For installations within the Mark VIe control system, the C version of the TBCI board is required to ensure proper mechanical alignment of connector JTI with the I/O pack’s mechanical support structure, guaranteeing secure and reliable connections under operational conditions. This ensures full functional integration of the TBCI board within the distributed control system while maintaining system redundancy and signal integrity.
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 TBCI2CG01 to the PDIA I/O pack using connector JR1. In a TMR system, connect TBCI to the three PDIAs using connectors JR1, JS1, and JT1. The PDIAs plug into TBCI and attach to side-mounting brackets. One or two Ethernet cables plug into the I/O pack. Firmware may need to be downloaded. 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 TBCI_IC are powered from a floating 125 V dc (100-145 V dc) supply from the turbine control. The 125 V bus is current-limited in the power distribution module before feeding each contact input. The H2, H3, and H4 versions use lower voltages (refer to the section, Specifications).
The discrete input voltage signals pass to the PDIA I/O pack, which sends them through optical isolators providing group isolation and transfers the signals to the Mark VIe 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.
WOC maintains the largest inventory of OEM replacement parts for GE Distributed Control Systems, ensuring that clients can source critical components quickly and reliably. In addition to supplying unused and fully rebuilt boards backed by a warranty, we offer comprehensive repair services for faulty or damaged modules, restoring them to full operational standards. Our team of highly skilled engineers and technicians is available 24/7, providing expert guidance and support for all OEM requirements, from component selection to system troubleshooting. Whether you need assistance with repairs, replacements, or technical consultation for your automation systems, WOC delivers prompt, dependable, and professional solutions. For inquiries regarding pricing, availability, or service details, please reach out to our team via phone or email.
What is the IS230TBCI2CG01?
The IS230TBCI2CG01 is a contact input terminal board used in GE Mark VI and Mark VIe Distributed Control Systems. It provides an interface for 24 discrete dry-contact inputs from field devices. The board features group isolation, ensuring electrical separation between input groups for reliable operation. It is typically used in simplex, dual, or TMR system configurations.
How many contact inputs does it support?
It supports 24 discrete contact inputs organized into electrically isolated groups. These inputs receive signals from switches, sensors, or status contacts in industrial applications. Group isolation ensures that faults in one input group do not affect others, maintaining signal integrity.
What is group isolation, and why is it important?
Group isolation separates input channels into independent electrical groups. This prevents a failure, short, or noise in one group from impacting other inputs. It is crucial for high-reliability and fault-tolerant systems in industrial process control.
Which systems is it compatible with?
The IS230TBCI2CG01 is compatible with GE Mark VI and Mark VIe control systems. It interfaces with PDIA I/O packs in simplex, dual, or TMR configurations. Proper version selection ensures mechanical and electrical alignment with the I/O system.
What type of inputs does the board accept?
It accepts dry-contact inputs, which are mechanical or solid-state switch closures. The board requires a DC excitation voltage supplied through its connectors to detect the input states. These inputs are processed and transmitted to the control system logic.
Where can I get replacements or repairs?
Replacement boards and refurbished units are available from WOC and other authorized GE distributors or service providers. Repairs should be done using genuine parts to ensure compatibility and maintain warranty coverage. WOC also provides technical support for troubleshooting, configuration guidance, and OEM repair services.
