A4H124-4FX P0973JN使用方法教程模块卡件自动化PLC/DCS工控设备

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工控产品产品特性
否是否进口
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产品详情

产品标题: A4H124-4FX P0973JN使用方法教程模块卡件自动化PLC/DCS工控设备

型号： A4H124-4FX P0973JN

品牌：ENTERASYS

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产品详情资料：

A4H124-4FX P0973JN

数据包在网络周围传输到所有节点，直到它返回到始发节点。然后，始发节点需要从网络中移除分组。然而，如果分组在通过另一个节点时以某种方式被改变，或者如果始发节点开始故障，则始发节点可能无法将分组识别为自己的分组，并且不会将分组从网络中移除。在这种情况下，数据包将继续通过网络。流氓包极为罕见。它们的存在表明，由于真实的组件故障或在恶劣环境中操作，电路板出现故障。通常，解决方案是隔离和更换故障板和/或改善环境。然而，一些用户更愿意容忍零星的恶意数据包，而不是在恶意数据包从网络中移除的情况下停止系统进行维护。为了提供对恶意数据包故障的容忍度，VMIVME-5565可以作为两个恶意主机之一运行。当数据包从一个节点传递到另一个节点时，恶意主机会更改数据包。当数据包***次返回到恶意主机时，恶意主机识别出它是一个恶意数据包，并将其从环中移除。当检测到恶意数据包时，在本地中断状态寄存器（LISR）中设置恶意数据包故障标志。恶意包故障位的断言可以可选地断言VMEbus中断，以通知主机该条件存在。

产品英文详情料:

The packet is transferred around the network to all nodes until it returns to the originating node. It is then a requirement of the originating node to remove the packet from the network. If, however, the packet somehow gets altered as it passes through another node or if the originating node begins to malfunction, then the originating node may fail to recognize the packet as its own and will not remove the packet from the network. In this case the packet will continue to pass around the network. Rogue packets are extremely rare. Their existence indicates a malfunctioning board due to true component failure or due to operation in an harsh environment. Normally, the solution is to ***late and replace the malfunctioning board and/or improve the environment. However, some users prefer to tolerate sporadic rogue packets rather than halt the system for maintenance provided the rogue packets are removed from the network. To provide tolerance to rogue packet faults, the VMIVME-5565 can operate as one of two rogue masters. A rogue master alters each packet as it passes from one node to another. When the packet returns to the rogue master a second time, the rogue master recognizes that it is a rogue packet and removes it from the ring. When a rogue packet is detected, a rogue packet fault flag is set in the Local Interrupt Status Register (LISR). The assertion of the rogue packet fault bit may optionally assert a VMEbus interrupt to inform the host that the condition exists.

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