IS230TBAOH1C - Analog Output Terminal Board

IS230TBAOH1C - Analog Output Terminal Board IS230TBAOH1C - Analog Output Terminal Board

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Part Number: IS230TBAOH1C
Manufacturer: General Electric
Series: Mark VI
Product Type: Analog Output Terminal Board
Number of channels: 16
Analog output current: 0-20 mA
Maximum Lead Resistance: 15Ω
Analog output current: 0-20 mA
Operating temperature: -30 to 65 °C
Size: 10.16 cm wide x 33.02 cm
Frequency: 50 or 60 Hz
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States


IS230TBAOH1C is an Analog Output Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Turbine Control Systems. The Analog Output (TBAO) terminal board supports 16 analog outputs with a current range of 0-20 mA. Current outputs are generated by the I/O processor, which can be local (Mark* VIe control) or remote (Mark VI control). The outputs have noise suppression circuitry to protect against surge and high-frequency noise. TBAO has two barrier-type terminal blocks for customer wiring and six D-type cable connectors. In Mark VI systems, TBAO works with the VAOC processor and supports simplex and TMR applications. Cables with molded plugs connect TBAO to the VME rack where the VAOC board is located. In TMR systems, TBAO is cabled to three VOAC boards.


Attach TBAO to a vertical mounting plate. Connect the wires for the 16 analog outputs directly to the two I/O terminal blocks mounted on the left of the board. Each point can accept two 3.0 mm (#12AWG) wires with 300 V insulation per point using spade or ring-type lugs. Each block is held down with two screws and has 24 terminals. A shield terminal strip attached to the chassis ground is located immediately to the left of each terminal block. Make cable connections to TBAO as follows:

  • In Mark VI systems, connect cables with molded plugs to the D-type connectors on the TBAO and to the VME rack where the VAOC processor is located. Use two cables for simplex or six cables for TMR.
  • In Mark VIe systems, plug the PAOC I/O packs directly into selected D-type connectors. Special side mounting brackets support the packs.


TBAO supports 16 analog control outputs. Driven devices should not exceed a resistance of 500 Ω (900 Ω if using I/O packs) and can be located up to 300 m (984 ft) from the turbine control cabinet. The VAOC or PAOC contains the D/A converter and drivers that generate the controlled currents. The output current is measured by the voltage drop across a resistor on the terminal board. Filters reduce high-frequency noise and suppress surgeon each output near the point of signal exit. In a TMR system, each analog current output is fed by the sum of the currents from the three I/O processors, as shown in the drawing below. The total output current is measured with a series resistor that feeds a voltage back to each I/O processor. The resulting output is the voted middle value (median) of the three currents.

WOC has the largest stock of GE Speedtronic Turbine Control System Replacement Parts. We can also repair your faulty boards. WORLD OF CONTROLS can also supply unused and rebuilt backed-up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on any parts and repairs, kindly get in touch with our team by phone or email.


How many analog control outputs does the terminal board support?

The terminal board supports a total of 16 analog control outputs. This allows for precise and flexible control over various external devices or processes.

What are the limitations of the driven devices connected to the analog control outputs?

The driven devices should not exceed a resistance of 500 ohms. However, if I/O packs are used, the resistance limit is increased to 900 ohms. Adhering to these resistance limits ensures the proper functioning and reliability of the analog control outputs.

What is the maximum distance between the turbine control cabinet and the driven devices?

The driven devices can be located up to 300 meters (984 feet) away from the turbine control cabinet. This extended distance allows for flexible placement of the controlled devices while still maintaining precise control from the central control system.