Overview: The IS200VAOCH1C is an Analog Output Board developed by General Electric as part of the Mark VI series, used in GE speedtronic Control Systems. This board is designed to control 16 analog outputs, each with a 20 mA current. The analog outputs are wired to analog output terminal boards (TBAO or DTAO). The VAOC board receives digital values from the controller over the VME backplane from the VCMI and converts these values into analog output currents, which are then sent to the terminal board for processing.
Functionality
The VAOC board operates by receiving digital values from the controller through the VME backplane. These values are then converted into corresponding 20 mA analog currents. The output current is monitored and controlled through feedback from the terminal board. This ensures that the actual output is maintained within the required specifications.
TMR (Triple Modular Redundant) Application
In TMR applications, control signals are fanned to the same terminal board from three separate VME board racks, labeled R, S, and T. To support all 16 outputs in TMR configurations, six cables are used. The final current output for each signal is determined by selecting the median value from the three VAOCs. Each VAOC board is equipped with a median select circuit that handles this process.
Key Features
16 Analog Outputs: The board controls 16 independent analog outputs, each with a 20 mA output current.
Feedback Control: The actual output current is measured on the terminal board and fed back to the VAOC board, where it is controlled to ensure accuracy.
TMR Compatibility: The board supports triple modular redundancy (TMR) configurations, where control signals are fanned to the terminal board from three VME racks (R, S, T).
Median Select Circuit: In TMR systems, the median of the three output currents is selected for each signal to ensure fault tolerance and reliability.
Applications
The IS200VAOCH1C Analog Output Board is used in GE speedtronic control systems, specifically for turbine control applications where accurate analog output is required for the operation of valves, actuators, and other control elements. The board's integration into TMR configurations ensures high reliability and fault tolerance in critical control systems.
Compatibility
Overview: The IS200VAOCH1C is an Analog Output Board developed by General Electric as part of the Mark VI series, used in GE speedtronic Control Systems. This board is designed to control 16 analog outputs, each with a 20 mA current. The analog outputs are wired to analog output terminal boards (TBAO or DTAO). The VAOC board receives digital values from the controller over the VME backplane from the VCMI and converts these values into analog output currents, which are then sent to the terminal board for processing.
Functionality
The VAOC board operates by receiving digital values from the controller through the VME backplane. These values are then converted into corresponding 20 mA analog currents. The output current is monitored and controlled through feedback from the terminal board. This ensures that the actual output is maintained within the required specifications.
TMR (Triple Modular Redundant) Application
In TMR applications, control signals are fanned to the same terminal board from three separate VME board racks, labeled R, S, and T. To support all 16 outputs in TMR configurations, six cables are used. The final current output for each signal is determined by selecting the median value from the three VAOCs. Each VAOC board is equipped with a median select circuit that handles this process.
Generations of VAOC Board
There are two generations of the VAOC board, each with corresponding terminal boards:
Original VAOC (up to VAOCH1B): This generation of the VAOC board, including all versions before and up to VAOCH1B, supports up to a 500 ? load resistance when driving 20 mA outputs. The board can handle a 1000 ft (304.8 m) cable with #18 wire. For proper operation, this generation requires the use of terminal board TBAOH1B or earlier, or any revision of DTAI.
Newest VAOC (VAOCH1C and subsequent versions): The VAOCH1C and later releases support higher load resistance on the first eight output circuits. For 20 mA outputs, a drive voltage of up to 18 V is available at the terminal board screw terminals. This allows operation with an 800 ? load resistance over 1000 ft (304.8 m) of #18 wire, providing margin. The second set of eight output circuits retains the original 500 ? load resistance rating. The VAOCH1C board requires terminal board TBAOH1C or later for proper operation.
Key Features
16 Analog Outputs: The board controls 16 independent analog outputs, each with a 20 mA output current.
Feedback Control: The actual output current is measured on the terminal board and fed back to the VAOC board, where it is controlled to ensure accuracy.
TMR Compatibility: The board supports triple modular redundancy (TMR) configurations, where control signals are fanned to the terminal board from three VME racks (R, S, T).
Median Select Circuit: In TMR systems, the median of the three output currents is selected for each signal to ensure fault tolerance and reliability.
Applications
The IS200VAOCH1C Analog Output Board is used in GE speedtronic control systems, specifically for turbine control applications where accurate analog output is required for the operation of valves, actuators, and other control elements. The board's integration into TMR configurations ensures high reliability and fault tolerance in critical control systems.
Operation
Overview: The IS200VAOCH1C is an Analog Output Board developed by General Electric as part of the Mark VI series, used in GE speedtronic Control Systems. This board is designed to control 16 analog outputs, each with a 20 mA current. The analog outputs are wired to analog output terminal boards (TBAO or DTAO). The VAOC board receives digital values from the controller over the VME backplane from the VCMI and converts these values into corresponding analog output currents, which are then sent to the terminal board for processing.
Functionality
The VAOC board operates by receiving digital values from the controller through the VME backplane. These values are then converted into corresponding 20 mA analog currents. The output current is monitored and controlled through feedback from the terminal board. This ensures that the actual output is maintained within the required specifications.
VAOC Circuitry
The VAOC supports 16 analog 0-20 mA outputs. It contains a Digital-to-Analog (D/A) converter and driver that generates the controlled currents. The output current is measured by the voltage drop across a resistor on the terminal board. To protect the system from surge and high-frequency noise, the terminal board outputs are equipped with noise suppression circuitry.
Simplex Configuration
In a simplex configuration, the VAOC generates and controls the analog output currents directly, without redundancy. The output is monitored and adjusted using feedback from the terminal board to ensure the correct output level.
TMR Configuration
In a Triple Modular Redundant (TMR) system, each analog current output is driven by the sum of the currents from three VAOC boards (R, S, and T). The total output current is measured through a series resistor, which provides a voltage back to each VAOC. The resulting output is the median of the three currents, which ensures fault tolerance.
If one of the VAOCs fails, the other two VAOCs will pick up the current and adjust to maintain the correct value. This redundancy ensures the output remains accurate even in the event of a failure in one of the modules.
In case of a circuit malfunction that cannot be cleared by the processor's commands, the malfunctioning circuit is disconnected by opening the shutdown relay contacts. This isolation function is only active when the system is configured for TMR operation, ensuring that a malfunction in one module doesn't affect the overall system performance.
Generations of VAOC Board
There are two generations of the VAOC board, each with corresponding terminal boards:
Original VAOC (up to VAOCH1B): This generation of the VAOC board, including all versions before and up to VAOCH1B, supports up to a 500 ? load resistance when driving 20 mA outputs. The board can handle a 1000 ft (304.8 m) cable with #18 wire. For proper operation, this generation requires the use of terminal board TBAOH1B or earlier, or any revision of DTAI.
Newest VAOC (VAOCH1C and subsequent versions): The VAOCH1C and later releases support higher load resistance on the first eight output circuits. For 20 mA outputs, a drive voltage of up to 18 V is available at the terminal board screw terminals. This allows operation with an 800 ? load resistance over 1000 ft (304.8 m) of #18 wire, providing margin. The second set of eight output circuits retains the original 500 ? load resistance rating. The VAOCH1C board requires terminal board TBAOH1C or later for proper operation.
Key Features
16 Analog Outputs: The board controls 16 independent analog outputs, each with a 20 mA output current.
Feedback Control: The actual output current is measured on the terminal board and fed back to the VAOC board, where it is controlled to ensure accuracy.
TMR Compatibility: The board supports triple modular redundancy (TMR) configurations, where control signals are fanned to the terminal board from three VME racks (R, S, T).
Median Select Circuit: In TMR systems, the median of the three output currents is selected for each signal to ensure fault tolerance and reliability.
Noise Suppression: Output currents are protected from surge and high-frequency noise through dedicated noise suppression circuitry on the terminal board.
Applications
The IS200VAOCH1C Analog Output Board is used in GE speedtronic control systems, specifically for turbine control applications where accurate analog output is required for the operation of valves, actuators, and other control elements. The board's integration into TMR configurations ensures high reliability and fault tolerance in critical control systems.
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