This GE Fanuc IC697VRM015 Fiber-Optic Reflective Memory with Interrupts is new from surplus stock.
Configuration:
• Memory: 256 KB Reflective Memory (SRAM)
Part Number: 332-000430-000 B
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Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Features:
- High-Speed, Easy-To-Use Fiber-Optic Network (170 Mbaud Serially)
- Data Written to Memory in One Node is also Written to Memory in All Nodes on the Network
- Up to 2,000m Between Nodes and up to 256 Nodes
- Data Transferred at 6.2 Mbyte/s without Redundant Transfer
- Data Transferred at 3.2 Mbyte/s with Redundant Transfer
The GE Fanuc IC697VRM015 Fiber-Optic Reflective Memory with Interrupts is a high-performance, multidrop VME-to-VME network. Data is transferred by writing to on-board global RAM. The data is automatically sent to the same location in memory on all Reflective Memory boards on the network.
The Reflective Memory concept provides a fast and efficient way of sharing data across distributed computer systems. Reflective Memory allows data to be shared between up to 256 independent systems (nodes) at rates up to 6.2 Mbyte/s. Each Reflective Memory board is configured with 256 Kbyte of on-board SRAM.
The local SRAM provides fast Read access times to stored data. Writes are stored in local SRAM and broadcast over a high-speed fiber-optic data path to other Reflective Memory nodes. The transfer of data between nodes is software transparent, so no I/O overhead is required. Transmit and Receive FIFOs buffer data during peak data rates to optimize CPU and bus performance to maintain high data throughput.
Reflective Memory also allows interrupts to one or more nodes by writing to a byte register. These interrupt (three level, user definable) signals may be used to synchronize a system process, or used to follow any data that may have preceded it. The interrupt always follows the data to ensure the reception of the data before the interrupt is acknowledged.
Reflective Memory requires no initialization unless interrupts are being used. If interrupts are used, vectors and interrupt levels must be written to on-board registers to arm the interrupts.
Each node on the system has a unique identification number between 0 and 255. The node number is established during hardware system integration by placement of jumpers on the board. This node number can be read by software by accessing an on-board register. In some applications, this node number would be useful in establishing the function of the node.
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