IS230STAI2ASTAI2AG21 - Compact Analog Input Terminal Board

SPECIFICATIONS:

Part No: IS230STAI2ASTAI2AG21
Manufacturer: General Electric
Product Type: Compact Analog Input Terminal Board
Series: Mark VIe
Number of Channels: 12
Power to Contacts: 125 V dc
Input Voltage: 120V AC
Output Voltage: 5V to 24V DC
Input span, transmitters: 1 - 5 V dc
Operating Voltage Range: 90V to 265V AC
Maximum lead resistance: 15 Ohms
Communication Protocols: Modbus
Technology: Surface Mount
Operating Temperature: 30°C to 65°C
Weight: 2.00 lbs
Size: 15.9 cm high x 10.2 cm
Country of Origin: USA
Availability: In stock
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS230STAI2ASTAI2AG21 is a Compact Analog Input Terminal Board manufactured and designed by General Electric and is part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The STAI board is a compact analog input terminal that handles 10 analog inputs and two analog outputs, connecting seamlessly to the PAIC pack. It supports various transmitter configurations, including two-wire, three-wire, four-wire, and externally powered types. The analog outputs are rated at 0-20 mA, with one configurable via jumper to 0-200 mA. Available exclusively in a simplex version, the board features high-density Euro-block terminal blocks and an onboard ID chip for system diagnostics and identification by the PAIC. In Mark VIe systems, the PAIC I/O pack works with the STAI. The I/O pack plugs into the D-type connector and communicates with the controller over Ethernet. Only simplex systems are supported. All revisions of STAI are compatible with all PAICs.

INSTALLATION:

The STAI and a plastic insulator can be mounted on a sheet metal carrier for DIN-rail installation. Alternatively, it can be attached to a sheet metal assembly and bolted directly to a cabinet. Typically, #18 AWG wires (shielded twisted pair) are used. I/O cable shield terminal is provided adjacent to the terminal blocks. The following types of analog inputs and outputs can be accommodated:

• Analog input, two-wire transmitter
• Analog input, three-wire transmitter
• Analog input, four-wire transmitter
• Analog input, externally powered transmitter
• Analog input, voltage ±5 V, ±10 V dc
• Analog output, 0-20 mA current
• Analog output, 0-200 mA current

OPERATION:

• The terminal board is designed to provide 24 V DC power, which is readily available to supply all connected transmitters or transducers. This built-in power supply simplifies system integration by eliminating the need for separate external power sources for each input device.

• The board features configurable input options, with onboard jumpers that allow users to select between current inputs (typically 4-20 mA) and voltage inputs (such as 0-5 V or 0-10 V), depending on the requirements of the measurement devices being connected. This flexibility makes the board suitable for a wide range of analog input signals commonly used in industrial process control. Regarding analog outputs, the terminal board includes two separate analog output circuits:

• One circuit is fixed at 4-20 mA, which is a standard signal range for transmitting analog process variables in industrial systems.

• The second analog output circuit is jumper-configurable, offering the option to operate either in the 4-20 mA range or in a 0-200 mA range, depending on the needs of the downstream control or monitoring equipment. This configurability ensures compatibility with various legacy systems or specialized instrumentation that may require different output ranges.

• However, a key limitation of this terminal board is that it includes only a single cable connection for communication and power. Due to this constraint, it cannot support Triple Modular Redundancy (TMR) applications like the TBAI terminal board can. In TMR configurations, three independent channels are used for fault tolerance and high system reliability, which typically require multiple cable paths or connections. The single cable design of this board makes it unsuitable for such high-availability architectures.

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FREQUENTLY ASKED QUESTIONS:

What is the IS230STAI2ASTAI2AG21?

IS230STAI2ASTAI2AG21 is a Compact Analog Input Terminal Board designed by General Electric for the Mark VIe turbine control system. It handles 10 analog inputs and 2 analog outputs with configurable ranges to support multiple transmitter types. The board interfaces directly with the PAIC I/O pack for data acquisition and control.

What types of analog input signals does this board support?

The board supports two-wire, three-wire, four-wire, and externally powered transmitters. It accommodates both current (4–20 mA) and voltage (±5 V, ±10 V) inputs through onboard jumper selection. This versatility enables use across a wide range of industrial sensing applications.

What analog output options are available on the STAI board?

It provides two analog output circuits: one fixed at 4–20 mA and another jumper-configurable for either 4–20 mA or 0–200 mA. This allows the board to interface with modern and legacy equipment requiring different current ranges. Both outputs are designed for precise, stable signal transmission.