GE IS200STCIH6AED Contact Input Terminal Board Unit

Module Feature

IS200STCIH6AED belongs to GE Mark VIe Speedtronic turbine control series STCI simplex contact input terminal board.

It is used as the field signal interface board of the turbine control system, collects dry contact switching signals from on-site limit switches, relay contacts, safety interlock switches and auxiliary equipment status feedback. It adopts optical isolation circuit to isolate field interference, built-in signal filtering, 24 channels of contact input, 24V DC wetting power supply. The signal is transmitted to the main control VDIM/VCMI board through D-SUB high-density cable. Widely used in power plant gas turbine, steam turbine safety interlock and auxiliary status monitoring, it is a common spare part for the maintenance of Mark VIe turbine control cabinet.

Working principle

The external dry contact closes or disconnects to change the loop state of the 24V wetting circuit on the board.

After photoelectric isolation and signal conditioning, the board converts the contact state into digital signal and sends it to the Mark VIe main controller. The controller judges the interlock condition and equipment state according to the contact signal, and executes protection logic or alarm output.

Onboard components

Green terminal block, photoelectric isolator, signal filtering circuit, D-SUB high-density connector, 24V power supply circuit, PCB substrate.

LED indicators

Onboard channel status LED, indicating whether each contact input channel is on.

Hardware self‑diagnosis

The main controller of Mark VIe performs continuous channel diagnosis, detects short circuit, open circuit and signal abnormality of the input loop, and generates alarm records in the system. The terminal board itself does not have independent diagnosis logic.

Programming software

ToolboxST, used for Mark VIe system configuration, signal tag setting, alarm viewing and fault diagnosis.

Electrical & Process Parameters

Model:IS200STCIH6AED Brand:GE Device type:Simplex contact input terminal board System:Mark VI / Mark VIe Speedtronic Input:24 channel dry contact Wetting voltage:24V DC Function:Field dry contact signal acquisition for turbine interlock monitoring

Mechanical & Structure

Mounting:Install inside turbine control cabinet Protection class:IP20 Housing:PCB board with terminal assembly

Environmental

Operating temperature:0℃ ~ +60℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing Certification:CE Status:GE original turbine control spare

Installation

Cut off the cabinet power supply before replacement, install the board to the fixed bracket, connect the field contact wire to the green terminal according to the drawing.

Connect the D-SUB communication cable to the corresponding main control board, confirm the cable number, download the configuration and test each channel signal after power on.

Interface

Field wiring terminal block, D-SUB signal cable port, 24V DC power connector.

Diagnostic

No channel signal: Terminal loose, field contact damage, wetting power loss. Signal flicker: Ground interference, poor contact of field switch. System report channel fault: Isolation circuit damage, wiring short circuit. Communication no response: D-SUB cable loose or pin damage.

Product BriefGE IS200STCIH6AED Mark VIe STCI simplex contact input terminal board, 24-channel dry contact acquisition board for gas and steam turbine control interlock signal collection.