GE IS200TBIH1BCE Speedtronic Mark VI Contact Input Terminal Board Product Description

Overview

GE IS200TBIH1BCE (also commonly referenced as IS200TBCIH1BCE) is a digital dry contact input termination board for the Speedtronic Mark VI / Mark VIe turbine control system. This IS200TBIH1BCE serves as the field signal interface for gas turbine, steam turbine and generator control racks, collecting passive contact signals from limit switches, pressure switches, relay status and safety interlock contacts. It is a legacy high-reliability turbine spare, widely used for power generation plant control cabinet maintenance and spare‑part replacement of Mark VI digital input terminal boards.

Features

GE IS200TBIH1BCE supports multi-channel dry contact digital input acquisition, with onboard galvanic isolation between field contact circuits and the Mark VI core control backplane to suppress ground loop noise and transient surge interference. This IS200TBIH1BCE uses barrier terminal blocks for convenient field wiring and circuit checking, separating field wiring from the sensitive main controller PCB. It reports channel status, open-circuit and internal hardware faults to the Mark VI controller via backplane communication; the turbine control HMI can display diagnostic alarms for maintenance. The board implements signal debounce filtering to avoid false triggering caused by contact bounce in high-vibration turbine environments. It adopts industrial-grade PCB material and conformal coating option for humidity, dust and oil mist resistance, and complies with power generation IEC 61131 and turbine control EMC standards. It mates with Mark VI backplane connectors and works with the core control board for turbine sequence, interlock and protection logic.

Specs

• Brand: GE General Electric

• Series: Speedtronic Mark VI / Mark VIe

• Model: IS200TBIH1BCE

• Type: Dry contact input termination board

• Input type: Passive dry contact

• Isolation: Galvanic isolation per channel group

• Mounting: Plug-in slot inside Mark VI turbine control rack

• Enclosure: PCB with terminal barrier block

• Application: Turbine interlock, trip status, field switch signal acquisition

• Lifecycle: Discontinued legacy turbine control spare

Principle

GE IS200TBIH1BCE receives on/off contact signals from field switches and auxiliary relays. Onboard isolation circuits separate the field side and control logic side, then send filtered logic status to the Mark VI main processor through the backplane bus. The controller uses these DI signals to execute startup sequence, emergency trip interlock, breaker status logic and alarm judgement. The built-in monitoring circuit continuously checks board power and channel integrity, and sends fault diagnostics to the turbine control system once anomalies are detected.

Applications

GE IS200TBIH1BCE is deployed in gas turbine power plants, steam turbine power stations, combined cycle units and industrial self-generation power plants. This Mark VI contact input board collects safety and auxiliary status signals for turbine sequence control and protection interlock. IS200TBIH1BCE fits turbine control rack overhaul and spare replacement of GE Speedtronic Mark VI digital input terminal boards.

Installation & Maintenance Notes

Follow official GE Speedtronic Mark VI maintenance manual and power plant lockout-tagout safety rules during replacement of IS200TBIH1BCE. Use ESD protection before handling the board. Confirm all field contact wiring is de-energized before disconnecting terminals. Record terminal mapping before unplugging. After replacement, download the turbine control configuration, verify each channel status reading and interlock logic. Confirm exact part number IS200TBIH1BCE; different Mark VI terminal boards (TBAI, TREG, TPRO) have different signal types and cannot be substituted casually.