IS230TBCIH1C - Contact Input with Group Isolation Terminal Board

IS230TBCIH1C - Contact Input with Group Isolation Terminal Board IS230TBCIH1C - Contact Input with Group Isolation Terminal Board

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Part Number: IS230TBCIH1C
Manufacturer: General Electric
Series: Mark VI
Product Type: Contact Input with Group Isolation Terminal Board
Number of channels: 24
Power supply voltage: 28 V dc
Voltage Range: 14 to 32 V dc
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: -30 to 65°C
Size: 33.02 cm high x 17.8 cm
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH6721


IS200TBCIH4C is a Contact Input with a Group Isolation Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. The TBCI works with the PDIA I/O pack and supports simplex, dual, and TMR applications. One, two, or three PDIAs can be plugged directly into the TBCI. The Mark VIe control requires the C version of this board for the correct mechanical alignment of connector JT1 to the I/O pack mechanical support.


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 the chassis ground is located immediately to the left of each terminal block. In a simplex system, connect the TBCI to the PDIA I/O pack using connector JR1. 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.


Filters reduce high-frequency noise and suppress surgeon input near the point of signal entry. The dry contact inputs on TBCI_1C are powered from a floating 125 V dc (100-145 V dc) supply from the turbine control. The 125 V dc bus is currently 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 are provided for each input, with one point (screw) providing the positive dc 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 the interface with remote solid-state output electronics. Contact input circuitry is designed for NEMA Class G creepage and clearance.

WOC has the largest stock of GE Speedtronic Gas Turbine Control System Replacement Parts. We can also repair your faulty boards. WORLD OF CONTROLS can also supply unused and rebuilt backed-up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on any parts and repairs, kindly get in touch with our team by phone or email.


How does a contact input terminal board work with a group isolation feature?

The contact input terminal board with group isolation integrates the functionality of managing multiple contact inputs with the added benefit of isolating these inputs into groups. This isolation enhances system reliability by reducing the risk of signal interference between different input groups.

Where are contact inputs with group isolation terminal boards used?

These terminal boards are commonly used in industrial automation, process control systems, PLC (Programmable Logic Controller) interfaces, and other applications where there's a need to manage numerous input signals reliably and efficiently.

Can these boards be integrated with PLCs or other control systems?

Yes, contact input terminal boards are designed to seamlessly integrate with PLCs, SCADA systems, and other control devices. They often support common communication protocols (such as Modbus, and Profibus) for easy interfacing.