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140DDO35300离散量输出模块
IEMMU11、IEMMU12、IEMMU21和IEMMU22是模块安装单元，用于安装标准INFI 90 OPEN系统模块和BRC-100 Harmony Bridge控制器系统机柜中的Symphony系统模块。
注：IEMMU11、IEMMU12、IEMMU21和IEMMU22模块安装单元可用作IEMMU01和IEMMU02模块安装单元。它们也可以一起安装带IEMMU01和IEMMU02装置；然而，过渡板IEMMU11、IEMMU12、IEMMU21或IEMMU22装置和IEMMU01或IEMMU02装置。模块安装单元由一个金属板卡底盘和一个印刷电路板背板组件组成。开放顶部和底部结构允许空气流过模块。安装法兰用于安装安装装置在标准Elsag Bailey 483毫米（19英寸）机柜中。模块可以快速方便地安装和拆卸。这个模块由卡导轨固定到位，连接器位于底板和模块的前面板，外加紧固件闩锁。
底板是多层印刷电路板组件包含电子元件、数据量探测插座、连接器和跳线。在大多数情况下，安装单元提供直接将I/O电缆耦合至模块。这方面的例外当BRC-100 Harmony Bridge控制器模块安装在MMU中。
参见处理器总线适配器第3节中的支架安装，以了解更多说明。
模块安装单元IEMMU11和IEMMU12模块安装单元提供最多12个系统模块或10个系统的物理安装模块和最多两个IEPAS02、IEPDS01/02、IEPAF02和IEPDF01/02电源模块。他们还提供I/O扩展器总线、模块总线和控制通道信号；稳压电源的分配电压（+5伏、+15伏、-15伏和24伏）；以及一次电源的分配。
主电源为120/240 VAC或24/48 VDC，为电源模块（IEPAS02、IEPAF02、IEPDS01、，IEPDF01、IEPDS02和IEPDF02），可安装在安装单元中。通常，使用IEPMU01/02的系统不要对安装单元使用分布式主电源。使用模块化电源系统II的系统不允许向安装单元提供分布式主电源。当机柜配置需要一个带有主机箱的后装机箱配电。
当机柜配置需要一个带有主机箱的前装机箱配电。
IEMMU21和IEMMU22模块安装单元提供最多12个系统模块的物理安装；提供I/O扩展器总线、模块总线和控制通道信号的配电；以及稳压电源的分配电压（+5 V、+15 V和-15 V）。IEMMU21/22模块安装单元是与模块化一起使用的首选电力系统II。
当机柜配置要求后装式机箱没有主机箱配电。
当机柜配置需要无主电源的前安装机箱时，使用IEMMU22安装单元分配
OVERVIEW
The IEMMU11, IEMMU12, IEMMU21, and IEMMU22 are module mounting units used to house standard INFI 90 OPEN system modules and the BRC-100 Harmony Bridge Controller module of the Symphony system in system cabinets. NOTE: IEMMU11, IEMMU12, IEMMU21, and IEMMU22 Module Mounting Units can be used as replacements for IEMMU01 and IEMMU02 Module Mounting Units. They can also be installed along with IEMMU01 and IEMMU02 units; however, transition board assemblies are required for interconnection between IEMMU11, IEMMU12, IEMMU21, or IEMMU22 units and IEMMU01 or IEMMU02 units. The module mounting unit consists of a sheet metal card chassis and a printed circuit board backplane assembly. The open top and bottom structure allow air to flow over the modules. Mounting flanges are provided for mounting the mounting unit in a standard Elsag Bailey 483-millimeter (19-inch) cabinet. Modules can be installed and removed quickly and easily. The module is held in position by card guides, the connectors on the backplane, and the module’s front panel, captive fastening latches. The backplane is a multilayer printed circuit board assembly containing electronic components, dipshunt sockets, connectors, and jumpers. In most cases, the mounting unit provides direct I/O cable coupling to the modules. The exception to this is when a BRC-100 Harmony Bridge Controller module is installed in the MMU. Refer to PROCESSOR BUS ADAPTER BRACKETS INSTALLATION in Section 3 for further explanation.
Module Mounting Units
The IEMMU11 and IEMMU12 module mounting units provide physical mounting for up to 12 system modules or ten system modules and a maximum of two IEPAS02, IEPDS01/02, IEPAF02, and IEPDF01/02 power modules. They also provide electrical distribution of I/O expander bus, module bus, and Controlway signals; distribution of regulated power supply voltages (+5 volts, +15 volts, –15 volts and 24 volts); and distribution of primary power. Primary power is the 120/240 VAC or 24/48 VDC that supplies power to power modules (IEPAS02, IEPAF02, IEPDS01, IEPDF01, IEPDS02 and IEPDF02) that can be mounted in the mounting units. Typically, systems that use IEPMU01/02 do not use distributed primary power to the mounting units. Systems that use Modular Power System II do not allow distributed primary power to the mounting units. The IEMMU11 module mounting unit is used when the cabinet configuration requires a rear mount chassis with primary power distribution. The IEMMU12 module mounting unit is used when the cabinet configuration requires a front mount chassis with primary power distribution.
The IEMMU21 and IEMMU22 module mounting units provide physical mounting for up to 12 system modules; provide electrical distribution of I/O expander bus, module bus, and Controlway signals; and distribution of regulated power supply voltages (+5 V, +15 V, and –15 V). The IEMMU21/22 module mounting units are the preferred choice for use with Modular Power System II. The IEMMU21 module mounting unit is used when the cabinet configuration requires a rear mount chassis with no primary power distribution. The IEMMU22 mounting unit is used when the cabinet configuration requires a front mount chassis with no primary power distribution.
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