GE IS200TTURH1C IS200TTURH1CFD | Terminal Board

Core Function and System Role

The GE IS200TTURH1C terminates mixed I/O signals for Mark VI turbine control. Specifically, this board handles both digital inputs and relay outputs. Moreover, it provides electrical isolation between field and logic circuits. The IS200TTURH1CFD variant includes conformal coating for harsh industrial environments.

Technical Specifications Overview

This turbine control terminal board features twenty-four digital input channels. Each input accepts 24 Vdc signals from field sensors. Furthermore, the board provides eight relay output channels for actuator control.

Parameter	Specification
Part Number	IS200TTURH1C / IS200TTURH1CFD
Type	Turbine Control Terminal Board / Mixed I/O Module
Digital Inputs	24 Channels, 24 Vdc
Input Isolation	2500 Vrms Optocouplers
Input Impedance	3.9 kΩ
Relay Outputs	8 Channels, Form C (SPDT)
Output Voltage	125 Vdc / 250 Vac Maximum
Output Current	2 A per Channel (Resistive)
Response Time	<2 ms (Input), <5 ms (Output)
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)	230 x 140 x 32 mm
Weight	0.92 kg
Onboard Energy Storage	8 x 220 µF, 35V Capacitors

Connector Layout and Component Count

The board uses four terminal blocks for field wiring connections. For instance, block TB1 handles digital inputs 1 through 12. Meanwhile, block TB2 manages digital inputs 13 through 24. Blocks TB3 and TB4 host the eight relay output channels. Two 50-pin D-sub connectors route I/O status to the controller. The IS200TTURH1CFD adds a thick conformal coating over all components.

Energy Storage and Signal Integrity

This terminal board includes local capacitance for stable operation. Specifically, eight 220 µF capacitors filter the 24 Vdc supply. Therefore, the board maintains reliable performance during transient loads. Additionally, onboard LED indicators show each channel’s real-time status. For example, green LEDs illuminate for active inputs and energized outputs. Off LEDs indicate inactive or faulted channels.

Diagnostic Features and Fault Detection

The board continuously checks each input for stuck conditions. Consequently, it detects welded contacts or wiring faults. Moreover, the GE IS200TTURH1C IS200TTURH1CFD includes output readback for relay verification. This feature confirms that mechanical contacts actually change state. An onboard status register reports all channel health to the main controller.

Maintenance and Hot Replacement

You can replace this terminal 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 turbine control.

Industrial Applications

This turbine control terminal board works inside GE Mark VI control cabinets. For reliable GE mixed I/O termination, the IS200TTURH1C and IS200TTURH1CFD deliver exceptional performance. They provide robust signal interfacing for steam and gas turbine control systems.