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AGILENT 5517B激光头
准备安装在安装选项模块之前，请执行以下操作：•确保以太网交换机类型正确。“受管”交换机通常建议支持IGMP侦听。“未管理”如果RSLogix 5000软件版本18.00或稍后，将使用，并且网络上的所有设备都配置为“单播”输入/输出。有关更多详细信息，请参阅以下文档：
–EtherNet/IP介质规划和安装手册，ODVA出版物148
–EtherNet/IP网络基础设施指南，ODVA出版物35–以太网设计注意事项参考手册，出版物ENET-RM002
•了解IGMP侦听/以太网交换机
选项模块是一个多播设备。在大多数情况下，IGMP需要侦听（受管）开关。如果不止一个或两个EtherNet/IP选项模块连接到交换机开关是必需的，否则驱动器可能会在网络IO超时时出现故障网络损失。
选项模块，RSLogix 5000软件版本18.00或更高版本
ControlLogix或CompactLogix控制器将支持单播。将驱动器添加到I/O时需要单播设置。什么时候所有选项模块都设置为单播设备，然后是IGMP侦听不需要（受管）交换机。许多EtherNet/IP隐式（I/O）消息传递使用IP多播分发I/O控制数据，这与CIP生产者一致/消费者模型。历史上，大多数交换机都处理多播数据包与广播数据包相同。也就是说，所有多播数据包都被重新传输到所有端口。
IGMP侦听通过动态限制多播流量的泛滥配置交换机端口，以便多播流量仅转发到端口与特定IP多播组关联。
支持IGMP侦听的交换机（受管交换机）“了解”哪些端口具有属于特定多播组的设备，并且只有将多播数据包转发到属于多播的端口组请注意交换机对IGMP侦听的支持程度。某些支持IGMP侦听的第2层交换机需要路由器（可能是第三层交换机）发送IGMP民意调查以了解设备是多播组的一部分。
某些第2层交换机可以使用IGMP侦听，无需路由器发送轮询。如果您的控制系统是独立网络或需要继续执行，如果路由器停止使用，请确保您使用的交换机支持IGMP在没有路由器的情况下侦听。
Preparing for an Installation
Before installing the option module, do the following: • Make sure the Ethernet switch is the correct type. A “managed” switch that supports IGMP snooping is usually recommended. An “unmanaged” switch can be used instead if RSLogix 5000 software, version 18.00 or later, is used and all devices on the network are configured for “unicast” I/O. For more details, see the following documents: – EtherNet/IP Media Planning and Installation Manual, ODVA publication 148 – EtherNet/IP Network Infrastructure Guidelines, ODVA publication 35 – Ethernet Design Considerations Reference Manual, publication ENET-RM002 • Understand IGMP Snooping/Ethernet Switches The option module is a multicast device. In most situations, an IGMP snooping (managed) switch is required. If more than one or two EtherNet/IP option modules are connected to the switch, a managed switch is required—otherwise the drive may fault on a Net IO Timeout network loss. The option module, RSLogix 5000 software version 18.00 or later, and a ControlLogix or CompactLogix controller will support unicast. Unicast setup is required when adding the drive to the I/O. When all option modules are set up as unicast devices, then an IGMP snooping (managed) switch is not needed.
Much of EtherNet/IP implicit (I/O)
messaging uses IP multicast to distribute I/O control data, which is consistent with the CIP producer/ consumer model. Historically, most switches have treated multicast packets the same as broadcast packets. That is, all multicast packets are retransmitted to all ports. IGMP snooping constrains the flooding of multicast traffic by dynamically configuring switch ports so that multicast traffic is forwarded only to ports associated with a particular IP multicast group. Switches that support IGMP snooping (managed switches) ‘learn’ which ports have devices that are part of a particular multicast group and only forward the multicast packets to the ports that are part of the multicast group. Be careful as to what level of support a switch has of IGMP snooping. Some layer 2 switches that support IGMP snooping require a router (which could be a layer 3 switch) to send out IGMP polls to learn what devices are part of the multicast group. Some layer 2 switches can use IGMP snooping without a router sending polls. If your control system is a standalone network or is required to continue performing if the router is out of service, make sure the switch you are using supports IGMP snooping without a router being present.
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