產(chǎn)品內(nèi)容介紹
AGILENT 5517B激光頭
準(zhǔn)備安裝在安裝選項模塊之前，請執(zhí)行以下操作：?確保以太網(wǎng)交換機類型正確?！笆芄堋苯粨Q機通常建議支持IGMP偵聽?！拔垂芾怼比绻鸕SLogix 5000軟件版本18.00或稍后，將使用，并且網(wǎng)絡(luò)上的所有設(shè)備都配置為“單播”輸入/輸出。有關(guān)更多詳細信息，請參閱以下文檔：
–EtherNet/IP介質(zhì)規(guī)劃和安裝手冊，ODVA出版物148
–EtherNet/IP網(wǎng)絡(luò)基礎(chǔ)設(shè)施指南，ODVA出版物35–以太網(wǎng)設(shè)計注意事項參考手冊，出版物ENET-RM002
?了解IGMP偵聽/以太網(wǎng)交換機
選項模塊是一個多播設(shè)備。在大多數(shù)情況下，IGMP需要偵聽（受管）開關(guān)。如果不止一個或兩個EtherNet/IP選項模塊連接到交換機開關(guān)是必需的，否則驅(qū)動器可能會在網(wǎng)絡(luò)IO超時時出現(xiàn)故障網(wǎng)絡(luò)損失。
選項模塊，RSLogix 5000軟件版本18.00或更高版本
ControlLogix或CompactLogix控制器將支持單播。將驅(qū)動器添加到I/O時需要單播設(shè)置。什么時候所有選項模塊都設(shè)置為單播設(shè)備，然后是IGMP偵聽不需要（受管）交換機。許多EtherNet/IP隱式（I/O）消息傳遞使用IP多播分發(fā)I/O控制數(shù)據(jù)，這與CIP生產(chǎn)者一致/消費者模型。歷史上，大多數(shù)交換機都處理多播數(shù)據(jù)包與廣播數(shù)據(jù)包相同。也就是說，所有多播數(shù)據(jù)包都被重新傳輸?shù)剿卸丝凇?/p>
IGMP偵聽通過動態(tài)限制多播流量的泛濫配置交換機端口，以便多播流量僅轉(zhuǎn)發(fā)到端口與特定IP多播組關(guān)聯(lián)。
支持IGMP偵聽的交換機（受管交換機）“了解”哪些端口具有屬于特定多播組的設(shè)備，并且只有將多播數(shù)據(jù)包轉(zhuǎn)發(fā)到屬于多播的端口組請注意交換機對IGMP偵聽的支持程度。某些支持IGMP偵聽的第2層交換機需要路由器（可能是第三層交換機）發(fā)送IGMP民意調(diào)查以了解設(shè)備是多播組的一部分。
某些第2層交換機可以使用IGMP偵聽，無需路由器發(fā)送輪詢。如果您的控制系統(tǒng)是獨立網(wǎng)絡(luò)或需要繼續(xù)執(zhí)行，如果路由器停止使用，請確保您使用的交換機支持IGMP在沒有路由器的情況下偵聽。
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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