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1、 IFSF布线标准 IFSF Cabling SpecificationAuthor: Shen, Yi1基于FTT的LON Network 架构简介Introduction on the structure of LON Network based on FTT. IFSF选择FTT自由网络拓扑收发器来实现基于LON Network的油站通讯。目前FTT自由网络拓扑收发器的版本号为 FTT-10A。IFSF has selected the FTT Free Topology Transceiver for its implementation of a LON Network as the
2、 forecourt local area network. The current production version of the FTT is the FTT-10A.同一 FTT 网络中最多可以有 64 个设备终端。但是考虑到网络的恢复能力和冗余，在实际应用中同一网络里一般不超过 32 个终端 .There can be a maximum number of 64 devices on a FTT network。 For resilience and redundancy in the forecourt environment it is not anticipated tha
3、t more than 32 devices are likely to be connected to any one site controller device. LON Network 的逻辑构架分为三层 There are three layers of the logical structure of the LON Network：域： 域标示了不同的应用设备。所有的前庭设备都归为DOMAIN1。Domain: It indicates different applications. All forecourt devices are installed in domain 1.
4、 子网：子网是一个节点号的逻辑组，用来区分设备类型。例如在实际应用中我们把加油机归为SUBNET 1，POS 归为SUBNET 2，液位仪归为SUBNET3。Subnet: A subnet is a logical grouping of nodes to indicate different type of devices. Dispenser belongs to subnet 1, POS belongs to subnet 2, and ATG belongs to subnet 9 practically.节点：同一子网中的不同个体都要有一个逻辑地址，即节点号。Node: Ever
5、y body in the same subnet should have there own logical address, namely node number.FTT 系统支持自由网络拓扑以及总线，星型，环路和其他混合型拓扑结构。The FTT system is designed to support free topology wiring, and will accommodate bus, star, loop or any combination of these topologies.A54EB3271938D84113E6A95A015D8783.PDF Page 2 o
6、f 6目前在用的拓扑结构如图1所示 Fig1 shows the topology we are using ：Fig 12. 主集线器Primary Junction Box 根据规定，FTT-10 LONWORKS 网络中有且仅有一个52.3 的终端电阻。这个电阻内置于主集线器中。任何LONWORKS网络有且仅有一个主集线器。According to the specification in a FTT-10 LONWORKS network there must be one and only one terminator resistor. It is recommended that
7、 this 52.3 resistor is placed in a junction box called the Primary Junction Box. On any site network there must be 主集线器 LON junction box 一号油机dispenser 1main brd 1通讯板commsboardmain brd 2通讯板commsboard防爆盒local boxN号油机dispenser nmain brd 1通讯板commsboardmain brd 2通讯板commsboard防爆盒local box二号油机dispenser 2ma
8、in brd 1通讯板commsboardmain brd 2通讯板commsboard防爆盒 local boxPOS外围设备LONperipheralA54EB3271938D84113E6A95A015D8783.PDF Page 3 of 6one and only one Primary Junction Box. 通 讯 线 的 屏 蔽 层 必 须 通 过 一 个 470k , 1/4 Watt, 10%的 金 属 膜 电 阻 接 地 ， 以 防静 电 干 扰 。 这 个 接 地 电 阻 应 该 同 终 端 电 阻 一 起 内 置 于 主 集 线 器 中 。Shield layer
9、 of cables must be connected to earth ground via a 470k, 1/4 Watt, 10%, metal film resistor to prevent static charge build-up. this resistor should, like the network terminator resistor, be installed in the Primary Junction Box图 2 给出了主接线器的结构 Fig 2 shows the structure of the main junction box：3. 通讯介质
10、的选择大多数双绞线可以在LON network网络中使用。使用非双绞线可能会有较大的线间干扰。通讯线的质量不会影响数据传输速率，而会限制最大通讯距离和接入网络的终端的数量。A54EB3271938D84113E6A95A015D8783.PDF Page 4 of 6The LON network will work on most types of twisted-pair cables. Problems may occur if non twisted-pair cables are used as they may pick-up interference. The cable qua
11、lity does not impact data transfer rates but limits the maximum cable lengths, number of connected nodes and available network topologies. 如果使用屏蔽线，屏蔽层必须通过接地电阻接地。Where shielded cable is installed, care must be taken to provide a single point ground connection. 下 面 的 表 A 和 表 B 给 出 了 符 合 IFSF 标 准 的 通 讯
12、 线 缆 的 特 性Following table A and B shows the characteristics of the cables that meet the IFSF specification.表A FTT通讯线的特性 Table A FTT Electrical Cable Characteristics 最大直流阻抗 /1000 英尺DC Resistance, /1000 feet maximum 18.0 28.6 最大直流阻抗失衡率%DC Resistance Unbalance, % maximum 5 双绞线间最大互耦电容 pF/英尺Mutual Capaci
13、tance of a Pair, pF/feet maximum17 最大对地不平衡电容 pF/1000 英尺Pair-to-Ground Capacitance Unbalance, pF/1000 feet maximum 1000 实际应用过程中选择安普永兴双屏蔽室外网线。其中以蓝色作为NET-A，蓝白作为NET-B，其他六根线悬空，屏蔽层通过接地电阻接地。We choose Anpuyongxing double shield out-door cable for the communication material. Blue one links to NET-A, blue/whi
14、te one links to NET-B , others are not used and the shield layer links to the earth via shield resister.4. 安装流程 INSTALLATION PROCESS A54EB3271938D84113E6A95A015D8783.PDF Page 5 of 65常见故障及故障排查 error and error handling（1） 收不到所有节点的数据包。Package of all nodes can not be received检查 POS 是否连接到主集线器；检查所有加油机是否正确
15、设置了节点号 ,并已经设置为联网模式。Check the main junction box to see if the POS has been linked to it correctly;A54EB3271938D84113E6A95A015D8783.PDF Page 6 of 6Check the configuration of all the dispensers to see if node numbers have been configured correctly and all the dispensers have been switched to console mode.（2） 收不到某个节点的数据包 package of certain node can not be received检查此节点是否正确配置了节点号；短接防爆盒中对应该节点的蓝色和蓝白色通讯线，在主集线器端
