5SHX1960L0004高压控制模块
图8-22显示了连接到LIL的车站的典型接线。链路布线和布线涉及双轴
电缆和双绞线。双轴电缆是一种双绞线屏蔽电缆，用于2英尺（0.6米）的运行或更多。非屏蔽双绞线主要用于连接行装站。双绞线布线也可用于长度不超过2英尺的线路，例如，站行之间的线路。
建议使用两种类型的双轴电缆：用于1500英尺（457米）以下链路的Belden 9182和Belden
9860适用于高达4000英尺（1220米）的链路。任何一种类型的电缆都可以在单个链路上使用。防止噪音干扰，配电站如下：
•不超过8个车站可连接在下连杆或上连杆的任何10英尺（3m）段内
•在上下链路的任何100英尺（30m）区段内，最多可连接16个车站
•在最多8个站点的集群之间插入100英尺的盘绕双轴电缆分接盒可安装为链路双轴电缆和双绞线之间的连接器接口连接到螺钉端子。分接盒通过包括八个瞬态来提供过压/防雷保护电压抑制器和一个130V电涌放电器。
链路终端也由两个150提供Ω 电阻器。
笔记：1.屏蔽的加蔽线连接至端子SG。16 AWG绝缘导线的短跳线将屏蔽接地至地面站在地面上。
2.屏蔽的加蔽线被切断并绝缘。
3.双绞线用于互连最多相隔2英尺（0.6米）的站。双轴电缆
用于大于2英尺（0.6米）的距离。最大双绞线长度为10英尺（3米）。
4.当链路末端没有分接盒时，在链路导线两端连接一个150欧姆±5%的电阻器在最后一站。
5.详见本地仪表链路安装和维修说明SD15492。8.4.10 LonWorks布线
图8-23显示了连接到Moore 353的典型LonWorks网络布线。网络终端电阻器为
随安装套件提供。提供的每个设备用户手册中都描述了与远程设备的连接
使用这些设备。接线指南见第8.4.2节。8.4.11 Modbus接线
本节描述了将主机设备连接到Moore 353 Modbus网络接口所需的布线。
当连接时，主机可以以命令/响应格式从摩尔353读取数据并将数据写入摩尔353。
大多数主机设备使用RS232通信，而Modbus网络接口为RS485。如图8所示-
24，安装了一个2线RS485到RS232转换器，以执行协议转换并调整连接
硬件主机设备和之间安装了带有DB9或DB25连接器的屏蔽RS232电缆转换器。RS485屏蔽双绞线将转换器连接到摩尔353。最多32摩尔353可以连接，因为RS485是一个多点网络。
下图为图8-24所示Entrelec®隔离转换器的跳线位置和标识符。
Figure 8-22 shows typical wiring for stations connected to the LIL. Link cabling and wiring involves twinaxial
cable and twisted pair wiring. Twinaxial cable is a twisted pair, shielded cable that is used for runs of 2 feet (0.6m)
or more. Unshielded twisted pair wiring is used mainly for interconnecting row mounted stations. Twisted pair
wiring can also be used for runs up to 2 feet in length, for example, between rows of stations.
Two types of twinaxial cables are recommended: Belden 9182 for links up to 1500 feet (457 meters) and Belden
9860 for links up to 4000 feet (1220 meters). Either type of cable may be used on a single link. To prevent noise
interference, electrically distribute stations as follows:
• no more than 8 stations may be connected within any 10 foot (3m) section of lower or upper link
• no more than 16 stations may be connected within any 100 foot (30m) section of lower or upper link
• insert 100 feet of coiled twinaxial cable between clusters of up to 8 stations
Tap boxes can be installed to serve as a connector interface between Link twinaxial cables and twisted pair wiring
connected to screw terminals. Tap boxes provide over-voltage/lightening protection by including eight transient
voltage suppressors and one 130V surge arrestor. Link termination is also provided by two 150Ω resistors. Notes:
1. Drain wire of shield connects to terminal SG. A short jumper of 16 AWG insulated wire grounds shield to
station earth ground.
2. Drain wire of shield is cut back and insulated.
3. Twisted pair wiring is used to interconnect stations separated by up to 2 ft (0.6 meters). Twinaxial cable
is used for distances greater than 2 ft (0.6 meters). The maximum twisted pair length is 10 ft (3 meters).
4. When there is no tap box at the end of a link, connect a 150 ohm ,±5%, resistor across the link conductors
at the last station.
5. See Local Instrument Link Installation And Service Instruction SD15492 for details.
8.4.10 LonWorks Wiring
Figure 8-23 shows typical LonWorks network wiring to the Moore 353. The network termination resistor is
supplied in the installation kit. Connections to remote devices are described in each device User’s Manual, supplied
with the devices. See Section 8.4.2 for wiring guidelines. 8.4.11 Modbus Wiring
This section describes the wiring needed to connect a host device to a Moore 353’s Modbus network interface.
When connected, the host can read data from and write data to a Moore 353 in a command/response format.
Most host devices communicate using RS232 while the Modbus network interface is RS485. As shown in Figure 8-
24, a 2-wire RS485 to RS232 converter is installed to perform the protocol conversion and adapt the connection
hardware. A shielded RS232 cable with either DB9 or DB25 connectors is installed between the host device and
the converter. An RS485 shielded, twisted-pair cable connects the converter to a Moore 353. Up to 32 Moore 353s
can be connected since RS485 is a multi-drop network.
Shown below are the jumper locations and identifiers for the Entrelec® Isolated Converter shown in Figure 8-24.
