HONEYWELL 51404305-275电阻模块,51404305-275使用方法教程
支持扩展和远程基板，因此25针D型内螺纹膨胀接头位于基板的右端，用于连接到扩展或远程基板。由于CPU是模块化的，因此可以在以下情况下更换或更改为其他类型：需要其他功能。每个系统只允许一个CPU基板。如果不止一个基板在系统中使用，附加的必须是扩展的或远程的类型。默认情况下，模块化CPU基板的机架号始终为0。电缆总长度不得超过50英尺（15米）互连扩展基板和CPU基板。膨胀基板不能单独存在。
HONEYWELL 51404305-275电阻模块它必须连接到具有CPU的系统。CPU可以位于PLC或个人计算机中配备个人计算机接口卡（见第11章）。每个系统允许的最大膨胀基板数量取决于与它们一起使用的CPU类型。对于CPU 331、340和341最大值为4。对于编号为350或更高的CPU，最大值为7。每个扩展基板有一个25针内螺纹D型输入/输出总线扩展连接器安装在其右端，用于连接到其他基板。有两种版本；5插槽（IC693CHS398）和10插槽（IC693CHS392）扩展背板不支持以下智能选项模块：PCM、ADC、BEM330和CMM。必须安装这些模块在CPU基板中。所有其他输入/输出和选项模块可以安装在任何机架类型。所有膨胀基板必须连接到公共接地（参见“安装”章节了解详细信息）。膨胀基板的物理尺寸相同，使用相同类型的电源提供并支持与远程设备相同的输入/输出和选项模块基板。
每个扩展基板都有一个机架编号选择DIP开关。
There can be no more than a total of 50 feet (15 meters) of cable
interconnecting Expansion baseplates and the CPU baseplate.
An Expansion baseplate cannot stand alone. It must be connected to a
system that has a CPU. The CPU can be in a PLC or in a Personal Computer
that is equipped with a Personal Computer Interface Card (see Chapter 11).
Maximum number of Expansion baseplates allowed per system depends on
the type of CPU they are used with. For CPUs 331, 340, and 341, the
maximum is 4. For CPUs numbered 350 and higher, the maximum is 7.
Each Expansion baseplate has a 25-pin female D-type I/O Bus Expansion
connector mounted at its right end for connection to other baseplates.
Available in two versions; 5-slot (IC693CHS398) and 10-slot (IC693CHS392)
An Expansion backplane does not support the following intelligent option
modules: PCM, ADC, BEM330, and CMM. These modules must be mounted
in a CPU baseplate. All other I/O and option modules can be mounted in any
type of rack.
All Expansion baseplates must be connected to a common ground (see the
“Installation” chapter for details).
Expansion baseplates are the same physical size, use the same type power
supplies, and support the same I/O and option modules as the Remote
baseplates.
Each Expansion baseplate has a Rack Number Selection DIP switch.
