5SHX1960L0004高壓控制模塊
圖8-22顯示了連接到LIL的車站的典型接線。鏈路布線和布線涉及雙軸
電纜和雙絞線。雙軸電纜是一種雙絞線屏蔽電纜，用于2英尺（0.6米）的運(yùn)行或更多。非屏蔽雙絞線主要用于連接行裝站。雙絞線布線也可用于長度不超過2英尺的線路，例如，站行之間的線路。
建議使用兩種類型的雙軸電纜：用于1500英尺（457米）以下鏈路的Belden 9182和Belden
9860適用于高達(dá)4000英尺（1220米）的鏈路。任何一種類型的電纜都可以在單個(gè)鏈路上使用。防止噪音干擾，配電站如下：
?不超過8個(gè)車站可連接在下連桿或上連桿的任何10英尺（3m）段內(nèi)
?在上下鏈路的任何100英尺（30m）區(qū)段內(nèi)，最多可連接16個(gè)車站
?在最多8個(gè)站點(diǎn)的集群之間插入100英尺的盤繞雙軸電纜分接盒可安裝為鏈路雙軸電纜和雙絞線之間的連接器接口連接到螺釘端子。分接盒通過包括八個(gè)瞬態(tài)來提供過壓/防雷保護(hù)電壓抑制器和一個(gè)130V電涌放電器。
鏈路終端也由兩個(gè)150提供? 電阻器。
筆記：1.屏蔽的加蔽線連接至端子SG。16 AWG絕緣導(dǎo)線的短跳線將屏蔽接地至地面站在地面上。
2.屏蔽的加蔽線被切斷并絕緣。
3.雙絞線用于互連最多相隔2英尺（0.6米）的站。雙軸電纜
用于大于2英尺（0.6米）的距離。最大雙絞線長度為10英尺（3米）。
4.當(dāng)鏈路末端沒有分接盒時(shí)，在鏈路導(dǎo)線兩端連接一個(gè)150歐姆±5%的電阻器在最后一站。
5.詳見本地儀表鏈路安裝和維修說明SD15492。8.4.10 LonWorks布線
圖8-23顯示了連接到Moore 353的典型LonWorks網(wǎng)絡(luò)布線。網(wǎng)絡(luò)終端電阻器為
隨安裝套件提供。提供的每個(gè)設(shè)備用戶手冊中都描述了與遠(yuǎn)程設(shè)備的連接
使用這些設(shè)備。接線指南見第8.4.2節(jié)。8.4.11 Modbus接線
本節(jié)描述了將主機(jī)設(shè)備連接到Moore 353 Modbus網(wǎng)絡(luò)接口所需的布線。
當(dāng)連接時(shí)，主機(jī)可以以命令/響應(yīng)格式從摩爾353讀取數(shù)據(jù)并將數(shù)據(jù)寫入摩爾353。
大多數(shù)主機(jī)設(shè)備使用RS232通信，而Modbus網(wǎng)絡(luò)接口為RS485。如圖8所示-
24，安裝了一個(gè)2線RS485到RS232轉(zhuǎn)換器，以執(zhí)行協(xié)議轉(zhuǎn)換并調(diào)整連接
硬件主機(jī)設(shè)備和之間安裝了帶有DB9或DB25連接器的屏蔽RS232電纜轉(zhuǎn)換器。RS485屏蔽雙絞線將轉(zhuǎn)換器連接到摩爾353。最多32摩爾353可以連接，因?yàn)镽S485是一個(gè)多點(diǎn)網(wǎng)絡(luò)。
下圖為圖8-24所示Entrelec?隔離轉(zhuǎn)換器的跳線位置和標(biāo)識符。
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 150? 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.
