IS200VCMIH2CAA - VME Bus Master Communication Controller Board

SPECIFICATIONS:

Part Number: IS200VCMIH2CAA
Manufacturer: General Electric
Series: Mark VI
Product Type: VME Bus Master Communication Controller Board
Operating System: QNX
Power Requirements: +5 V dc, 6 A
Number of input channels: 24
Processor: TMS320C32 32-bit
Number of relay channels: 12
Trip Solenoid Rating: 125 V dc
Power supply voltage: 28 V dc
Dual-Port Memory: 32 Kbytes
Voltage Range: 18 - 32 VDC
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: 40 to 70°C
Size: 168 x 150 x 55 mm
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421M

FUNCTIONAL DESCRIPTION:

IS200VCMIH2CAA is a VME Bus Master Communication Controller Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. The VCMI serves as the communication link between the controller and I/O boards, as well as the interface to the IONet, the system control network. Acting as the VME bus master within both control and I/O racks, the VCMI oversees the identification of all boards in the rack, including their terminal boards. The diagram depicts three simple system setups that incorporate both local and remote I/O connected via the VCMI. Several I/O racks can connect to the IONet, each equipped with its own VCMI board. For applications that need high-speed data transfer with minimal latency, the VCMI provides a second IONet port, which can be utilized as a parallel IONet channel, as illustrated in the lower section of the diagram. In the first example, a compact system is presented in which all I/O is housed within the VME control rack, eliminating the need for remote I/O racks. Each channel (R, S, T) operates with its dedicated IONet, and the VCMI is equipped with three IONet ports.

FUNCTIONS:

• Primary Bus Controller: As the VME bus master, the board controls the data flow within the VME bus, ensuring data packets are transferred to and from the controller and I/O boards with precise timing and order.

• Task Coordination: The VME bus master coordinates multiple tasks by managing and prioritizing data requests, controlling the flow of data across the bus, and preventing communication conflicts.

• Controller to I/O Interface: The VME master controller serves as a bridge between the main controller and the individual I/O boards, allowing for real-time data transfer and command signals to control equipment and processes.

• Data Packet Management: It manages the incoming and outgoing data packets, interpreting and routing them to appropriate I/O boards to execute the necessary commands or to relay sensor information back to the controller.

• Primary Interface to IONet: The VME bus master acts as the main interface to the system control network (IONet), enabling the interconnection of multiple I/O racks over a common network.

• Multi-Rack Communication: In distributed control systems, where multiple I/O racks may be located remotely, each rack contains a VCMI (VME Communication Module Interface) that facilitates communication across the IONet, ensuring synchronized data exchange across the entire control system.

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FREQUENTLY ASKED QUESTIONS:

How does the VME Bus Master handle communication between the controller and I/O boards?

The VME Bus Master serves as the bridge for data transfer between the controller and I/O boards. It manages data packets, routes information to appropriate boards, and ensures that commands from the controller reach the I/O devices efficiently and accurately.

What is the function of the second IONet port on the VME Bus Master?

The secondary IONet port allows for parallel communication, which increases data throughput and reduces latency. It is often used as a redundant communication pathway, ensuring high availability in critical applications by maintaining network reliability if the primary IONet channel fails.

How does the VME Bus Master handle board identification and addressing?

The VME Bus Master assigns unique addresses to each board in the rack, creating a structured address map that enables targeted communication. It also manages identification for terminal boards associated with I/O boards, ensuring correct configuration and data flow.