PM891K01是一种高性能控制器，能够处理应用程序要求很高。
PM891K01通过光学模块连接到S800 I/O系统。它可以行动作为独立的过程控制器，或作为执行本地控制任务的控制器在控制网络中。
两个PM891控制器可以作为一对冗余控制器一起工作，其中一个为PM891用作主控制器，而另一个用作备用控制器。备份如果在主控制器。
通过两个内置IEEE802.3以太网实现控制网络连接PM891上的通道。
PM891还提供通信扩展总线（CEX总线）可以连接多个扩展模块。这些模块提供连接适用于各种现场总线和I/O系统。在冗余对的情况下，两者PM891连接到同一CEX总线，其中一个可以控制模块。
English Description：
The PM891K01 is a high-performance controller capable of handling applications with high demands.
The PM891K01 is connected to the S800 I/O system via an optical module. It can act as a stand-alone process controller or as a controller performing local control tasks in a control network.
Two PM891 controllers can be operated together as a redundant pair, where one for the PM891 is used as the main controller and the other as the backup controller. The backup if in the primary controller.
Control network connectivity to the channels on the PM891 is achieved via two built-in IEEE802.3 Ethernet.
The PM891 also provides a Communication Expansion Bus (CEX bus) to connect multiple expansion modules. These modules provide connections for a variety of fieldbus and I/O systems. In the case of a redundant pair, both PM891s are connected to the same CEX bus, and one can control the module.
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