IS200TBAIH1C - Analog Input Terminal Board

Functional Description

IS200TBAIH1C Analog Input Terminal Board

IS200TBAIH1C is an Analog Input Terminal Board manufactured and designed by General Electric as part of the Mark VI series used in gas turbine control systems. Two outputs and 10 analog inputs are supported by the Analog Input terminal board. Two-wire, three-wire, four-wire, or transmitters that are powered externally can all be plugged into one of the ten analog inputs. A current of 0-20 mA or 0-200 mA can be configured for the analog outputs. Surge and high-frequency noise are protected from by noise suppression circuitry in the inputs and outputs.

For connecting to the I/O processors, the TBAI has three DC-37 pin connectors available. It is possible to connect using TMR with all three connectors or simplex on one connector (JR1). Both direct connections to the electronics and cable connections are possible. To the three connectors for the R, S, and T controls in TMR applications, the input signals are fanning outward. Utilizing a measuring shunt on the TBAI, the total current of the three output drivers that are connected is combined to run TMR outputs. Following that, the electronics are given the total current signal by the TBAI so they can regulate it to the specified setpoint.

IS200TBAIH1C Diagnostics

• The output current is indicated by the board using the voltage drop across a series resistor. If either of the two outputs becomes unhealthy, the I/O processor generates a diagnostic alarm (fault).
• The I/O controller queries each cable connector's unique ID device on the terminal board. The ID device is a read-only chip that has the JR, JS, and JT connector locations, along with the serial number, board type, and revision number of the terminal board. A hardware incompatibility fault is produced when this chip is read by the I/O controller and a mismatch is discovered.

Configuration

• The terminal board can be configured using jumpers. Refer to the installation diagram for the position of these jumpers. The available jumpers are as follows:
• Current input or voltage input can be chosen using the jumpers J1A through J8A.
• Whether the return is linked to common or left open is determined by jumpers J1B through J8B.
• Input current is chosen between 1 mA and 20 mA using the jumpers J9A and J10A.
• Whether the return is linked to common or left open is determined by jumpers J9B and J10B.
• Output 1 is adjusted to 20 mA or 200 mA by jumper J0.

Characteristics

• Number of channels: 12
• Temperature: -30 to 65°C (-22 to +149°F)
• Size: 10.16 cm wide x 33.02 cm

Installation

The two I/O terminal blocks located on the terminal board are directly linked to the 10 inputs and the two outputs. Each block is secured with two screws and contains 24 terminals that can accommodate wires up to #12 AWG. Next to each terminal block is a shield terminal attachment point. The following categories of analog inputs and outputs can be supported:

• A two-wire transmitter with an analog input
• Three-wire transmitter with analog input
• A four-wire transmitter with an analog input
• A transmitter with an analog input and external power
• Analog input, 5 and 10 volts direct current
• 0-20 mA analog output
• 0-200 mA analog output

Operation

All of the transducers have access to a 24 V dc power source on the terminal board. By employing jumpers, one can select between current and voltage inputs. One of the two analog output circuits can be configured through a jumper for 4-20 mA or 0-200 mA, while the other can be adjusted for either. TMR applications can both use the same terminal board.

Transmitters/transducers can be individually powered or can be powered by the 24 V dc source in the control system. Jumpers J#A, J#B, and JO on the terminal board configure the input and output types of voltage and current, respectively. Diagnostics track each output, and if a defect cannot be fixed by a CPU command, a suicide relay in the I/O controller disconnects the relevant output.