GE Mark VI IS200TBAIH2C 24-Channel Analog Input Board

Product Description

The IS200TBAIH2C is a high-density Analog Input Terminal (TBAI) board engineered specifically for the General Electric Speedtronic Mark VI control system. This module functions as the primary termination and conditioning interface for up to 24 analog field signals, including 4–20 mA transmitter loops and ±5 VDC or ±10 VDC sensor inputs. By centralizing field wiring, the IS200TBAIH2C provides critical signal isolation and hardware filtering to ensure that clean, accurate data is transmitted to the control rack processors.

This revision, IS200TBAIH2C, is designed for simplex applications but maintains the rigorous electromagnetic compatibility (EMC) standards required for gas and steam turbine protection. Each of the 24 channels is equipped with passive filtering components to suppress high-frequency noise and prevent contact bounce or interference from power-level equipment. The board features two large, 48-point screw-type terminal blocks, facilitating robust field connections and straightforward maintenance during routine system inspections.

Technical Specifications

• Model Number: IS200TBAIH2C

• Series: Mark VI Speedtronic Control

• Functional Acronym: TBAI (Analog Input Terminal Board)

• Input Capacity: 24 Analog Input Channels

• Signal Support: 4–20 mA current loops, ±5 VDC, or ±10 VDC inputs

• Input Impedance: 250 ohms for current loop sensing

• Isolation Threshold: Optical and electrical isolation per channel

• Filtering Logic: Passive hardware RC filtering for EMI suppression

• Connector Type: 2 x 48-point screw terminal blocks

• Operating Temperature: -20 °C to +60 °C (-4 °F to 140 °F)

• Storage Temperature: -40 °C to +85 °C (-40 °F to 185 °F)

• Dimensions: 170 mm x 90 mm

• Net Weight: 0.35 kg

• Standard Compliance: IEC 61326-1 (Industrial EMC Standards)

System Role & Implementation

In a Mark VI control rack, the IS200TBAIH2C is typically positioned within the I/O sub-rack, connected via high-density cables to the VBAI or equivalent processor cards. It is the first point of contact for vital turbine sensors such as pressure transducers, fuel flow meters, and vibration transmitters. Its ability to scale and filter these signals before they reach the controller is fundamental to maintaining turbine stability and protecting expensive capital equipment from inaccurate sensor data.

Frequently Asked Questions

Can the IS200TBAIH2C be used for thermocouple inputs?While the TBAI board is designed for analog current and voltage, it is not optimized for the millivolt-level signals or cold junction compensation required for thermocouples. For temperature sensing, the TBTC or similar thermocouple terminal boards should be utilized.

What is the difference between H1C and H2C revisions?The IS200TBAIH2C specifically designates the input signal ranges and terminal block configuration. Revision H2C typically includes hardware optimizations for improved 4–20 mA loop stability and updated component aging profiles compared to the earlier H1C versions.