NXPP-06C NXPP06C 应DCS系统适配器主板 ABB
两种有效连接可能性：
•处理器单元和BC820的单电源（SD8xx或SS8xx）
在两个段（即段A和B）上。参见115页图38。
•段A上处理器单元的一个电源（SD8xx或SS8xx），以及
B段上的BC820，以及用于
段B上的处理器单元和段A上的BC820。参见图39
116页。
连接到BC820的CEX总线单元的大数量为六个。这个
BC820的主要功能是将CEX总线划分为两个物理上独立的总线
增加系统可用性的段，一个段上出现故障的CEX总线单元
不会影响处理器单元或其他CEX总线段。也是
需要注意的是，当使用BC820和冗余CEX总线时
单元这些单元应安装在不同的BC820 CEX总线段上。
不要将用BC820分隔的两个CEX总线段相互连接
带有CEX总线延长电缆TK850。
为了获得冗余电源，将外部连接器连接到
SS82x投票设备。有关SS82x连接的详细信息，请参阅安装
145页的SS823/SS832表决装置。另请参阅外部电源
资料来源：183页。
2节安装：安装CEX总线互连单元BC820/TP850
3BSE036351-600 A 111
BC820 CEX总线互连单元提供了一种将CEX总线分段的方法
分成两个独立的段。这提高了以下系统的可用性：
冗余通信接口。图35显示了一种配置
实例底板有一个预设的两个字母的Alpha代码锁，以防止
在TP850基板上安装不正确类型的装置。
BC820由处理器单元通过CEX总线供电，也可以：
通过外部连接器为CEX总线提供冗余电源
电源。
BC820传输RCU链路并扩展CEX总线和RCU链路电缆
长度可达200米。CEX总线接口的数量限制为6个，每个接口
BC820。
不允许在通电和运行状态下操纵CEX总线底板
系统在更换或移除基板之前，该基板上的所有CEX模块
必须删除段。
BC820只能与PM858、PM862、PM866（PR:F或更高版本，其中
对应于PM866K01的PR:H或更高版本），PM866A
图35.冗余通信接口单元和控制器
安装CEX总线互连单元BC820/TP8502节安装
112 3BSE036351-600 A
BC820单元可以设置为两种不同的状态，称为上状态或下状态。注意
不允许将一对中的两个单元设置为相同的状态。i、 e.一个
设置为较低，另一个设置为较高。其原因是支持角色中的功能
控制器CPU之间的主要和次要选择。拨动开关
选择状态，见图36。
位于主或单个控制器CPU旁边的BC820的热插拔，
否则称为“直接BC820”，可能危及整个控制器和
除非CEX总线上的每个模块都处于
非工作状态。
BC820的热插拔不位于主或单个控制器CPU旁边，
如果找到“间接BC820”，将关闭非冗余接口
位于CEX总线段上，除非
接口已经处于非操作状态，或者它们的功能对于
控制器。
图36.BC820拨动开关
2节安装电缆和连接器
3BSE036351-600 A 113
电缆和连接器
RCU控制链路：模块化插孔、RJ45、屏蔽双绞线交叉电缆
所有四对交叉：EIA/TIA-568标准交叉T568A至T568B参见
下表10。长度：大200米。
RCU数据链路：光互连与LC双工光兼容
符合ANSI TIA/EIA60-10（FOCIS 10A）的连接器接口。类型
光缆为50/125µm OM3光纤。长度：大200米。
外部24V直流电源（L+，L-）：用于2极接线板的电缆组件。
长度：大10米。包装中包括插头。
RCU链路电缆TK857V003：控制器CPU和BC820之间的电缆。
长度：0.3M。包装中包含2件。
所有四对必须交叉。
表10.交叉电缆引脚（如T568A至T568B所示）
连接器A[引脚]颜色连接器B[引脚]色彩
1白/绿1白/橙
2绿色2橙色
3白/橙3白/绿
4蓝色4白色/棕色
5白色/蓝色5棕色
6橙色6绿色
7白色/棕色7蓝色
8棕色8白色/蓝色
屏蔽编织物屏蔽编织物 NXPP-06C NXPP06C 应DCS系统适配器主板 ABB
 NXPP-06C NXPP06C 应DCS系统适配器主板 ABB
two valid connection possibilities:
• Single power source (SD8xx or SS8xx) for the processor units and the BC820s
on both the segments (say, segments A and B). See Figure 38 on page 115.
• One power source (SD8xx or SS8xx) for the processor unit on segment A and
the BC820 on segment B, and another power source (SD8xx or SS8xx) for the
processor unit on segment B and the BC820 on segment A. See Figure 39 on
page 116.
The maximum number of CEX-Bus units connected to a BC820 is six. The
primary function of BC820 is to divide the CEX-Bus into two physically separate
segments for increased system availability, a faulty CEX-Bus unit on one segment
will not affect the processor unit or the other CEX-Bus segment. It is also
important to note that when using the BC820 together with redundant CEX-Bus
units these units shall be mounted on different BC820 CEX-Bus segments.
Do not connect the two CEX-Bus segments, separated with BC820, to each other
with CEX-Bus extension cable TK850.
For obtaining redundant power supply, connect the external connector to the
SS82x voting device. For details of SS82x connections, see Installing the
SS823/SS832 Voting Unit on page 145. See also Powering from an External
Source on page 183.
Section 2 Installation Installing the CEX-Bus Interconnection Unit BC820/TP850
3BSE036351-600 A 111
The BC820 CEX-Bus Interconnection Unit, offers a way to section the CEX-Bus
into two independent segments. This improves availability in systems with
redundant communication interfaces. Figure 35 on page 111 shows a configuration
example. The base plate has a preset, two letter Alpha code lock to prevent the
installation of an incorrect type of unit onto the TP850 base plate.
The BC820 is powered from the processor unit via the CEX-Bus and can also
support the CEX-Bus with redundant power through its external connector for
power supply.
BC820 transmits the RCU-Link and extends the CEX-Bus and RCU-Link cable
length up to 200 m. The number of CEX-Bus interfaces is limited to 6 with each
BC820.
It is not allowed to manipulate CEX bus base plates in a powered and running
system. Before changing or removing a base plate, all CEX modules on that
segment must be removed.
BC820 can only be used with PM858, PM862, PM866 (PR:F or later, which
corresponds to PR:H or later for PM866K01), PM866A
Figure 35. Redundant Communication Interface Units and Controllers
Installing the CEX-Bus Interconnection Unit BC820/TP850 Section 2 Installation
112 3BSE036351-600 A
The BC820 unit can be set in two different states, called upper or lower. Note that
the two units in a pair never are allowed to be set to the same state. i.e. one shall be
set to lower and the other to upper. The reason for that is to support functions in role
selection, primary and secondary, between the controller CPUs. A toggle switch
selects the state, see Figure 36.
Hot swap of the BC820 located next to a primary or single controller CPU,
otherwise called “direct BC820”, might jeopardize the whole controller and
should not be performed unless every module on the CEX-Bus are in a
non-operating state.
Hot swap of the BC820 is not located next to a primary or single controller CPU,
if located then “indirect BC820”, will shut down and non-redundant interface
located on that CEX-Bus segment, should not be performed unless such
interfaces already are in a non-operating state or their function is dispensable for
the controller.
Figure 36. BC820 Toggle Switch
Section 2 Installation Cables and Connectors
3BSE036351-600 A 113
Cables and Connectors
RCU Control Link: Modular Jack, RJ45, shielded twisted pair crossover cable with
all four pairs crossed: EIA/TIA-568 standard crossover T568A to T568B see
Table 10 below. Length: max 200m.
RCU Data Link: The optical interconnection is compatible with LC Duplex optical
connector interface conforming to ANSI TIA/EIA60-10 (FOCIS 10A). The type of
optical cable is 50/125µm OM3 fiber. Length: max 200m.
External 24V DC supply (L+, L-): Cable assembly for 2-pole terminal block.
Length: max 10m. Plugs included in package.
RCU-Link Cable TK857V0003: Cable between controller CPU and BC820.
Length: 0,3M. 2 pieces included in package.
All four pairs must be crossed.
Table 10. Crossover cable pinout (shown as T568A to T568B)
Connector A [pin] Color Connector B [pin] Color
1 White/Green 1 White/Orange
2 Green 2 Orange
3 White/Orange 3 White/Green
4 Blue 4 White/Brown
5 White/Blue 5 Brown
6 Orange 6 Green
7 White/Brown 7 Blue NXPP-06C NXPP06C 应DCS系统适配器主板 ABB
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