GE IS200TBCIH2B IS200TBCIH2BBC | Contact Input Terminal

Core Function and System Role

The GE IS200TBCIH2B terminates dry contact inputs for Mark VI systems. Specifically, this board monitors switch and relay contact states. Moreover, it provides electrical isolation between field and logic circuits. The IS200TBCIH2BBC variant includes conformal coating for harsh industrial environments.

Technical Specifications Overview

This contact input board features thirty-two dry contact input channels. Each channel accepts closure signals from field switches. Furthermore, the board includes wetting current for reliable contact operation.

Parameter	Specification
Part Number	IS200TBCIH2B / IS200TBCIH2BBC
Type	Contact Input Terminal Board / Dry Contact Module
Contact Inputs	32 Channels
Input Type	Dry Contact (Voltage-Free)
Wetting Current	5 mA per Channel
Open Circuit Voltage	24 Vdc
Contact Resistance	<100 Ω = Closed, >10 kΩ = Open
Isolation Voltage	2500 Vrms Optocouplers
Response Time	<5 ms
Status Indicators	32 Green LEDs
Power Supply	24 Vdc ±15%
Connector Types	2 x 50-pin D-sub, 4 x Terminal Blocks
Dimensions (W x H x D)	220 x 130 x 30 mm
Weight	0.78 kg
Onboard Energy Storage	6 x 100 µF, 35V Capacitors

Connector Layout and Component Count

The board uses four terminal blocks for field wiring connections. For instance, block TB1 handles inputs 1 through 8. Meanwhile, block TB2 manages inputs 9 through 16. Blocks TB3 and TB4 handle inputs 17 through 32. Two 50-pin D-sub connectors route contact status to the controller. The IS200TBCIH2BBC adds a thick conformal coating over all components.

Energy Storage and Signal Integrity

This contact input board includes local capacitance for stable operation. Specifically, six 100 µF capacitors filter the 24 Vdc supply. Therefore, the board rejects noise from long field wiring runs. Additionally, onboard LED indicators show each channel’s real-time status. For example, a green LED illuminates when a contact closes. An off LED indicates an open contact or wiring fault.

Diagnostic Features and Fault Detection

The board continuously checks each input for stuck conditions. Consequently, it detects welded relay contacts within 100 milliseconds. Moreover, the GE IS200TBCIH2B IS200TBCIH2BBC includes loop verification for each channel. This feature confirms that field contacts actually change state. An onboard status register reports all channel health to the main controller.

Maintenance and Hot Replacement

You can replace this contact input board without powering down the turbine. Thus, mean time to repair remains under ten minutes. The board stores no configuration data locally. Therefore, you simply install the replacement and resume normal contact monitoring.

Industrial Applications

This contact input terminal board works inside GE Mark VI control cabinets. For reliable GE dry contact interfacing, the IS200TBCIH2B and IS200TBCIH2BBC deliver exceptional performance. They provide robust switch monitoring for steam and gas turbine auxiliary systems.