继续学习。
1 Process stations
过程站
1.1 Overview
概述
A scalable Freelance system essentially consists of the process and operator stations. You can perform the necessary configuration and commissioning tasks from your PC using the Freelance Engineering software. Diagnoses are performed in graphic interfaces.
一个可伸缩的freelance系统由过程站和操作员站组成。你可以使用电脑上的freelance 工程软件执行配置和调试任务。图形界面执行诊断。
Among the functions supported by Freelance Engineering are the following:
freelance工程下列功能：
- Read and enhance configuration data from new field devices.从新的现场设备中读取和提高配置数据。
- Configure devices using the parameter setting dialogs and pre-defined I/O structures.使用参数设置对话框和预定义的I/O结构配置设备。
- Display bus cycle times and diagnostic data of devices.显示总线周期和设备诊断数据。
- Search the buses for nodes with unknown device addresses.在总线中搜索具有未知设备地址的节点。
- Exclude individual devices from cyclic communication.将单个设备排除在循环通信之外。
- Integrate new devices without the need to re-initialize the bus line.无需初始化总线线路，集成新的设备。
To configure your automation task, first create the required resources and programs in the project tree using editors conforming to IEC 61131-3. In the next step, these configured applications are allocated to the actually required hardware in the hardware editor and then loaded online into the process stations.
为了配置自动化任务，首先使用符合IEC 61131-3的编辑器在项目树中创建资源和程序。接下来，这些配置分配给硬件编辑器中实际需要的硬件，然后在线加载到过程站。
In order to facilitate the visualization of your process, powerful software packages such as Freelance Operations are available for operation.
为了促进过程可视化，诸如Freelance OPerations的强大的软件包可供操作。
A Freelance system supports different types of process stations (controllers) which can be combined as required. Currently, the controller types AC 900F, AC 800F and AC 700F are available.
一个freelance系统支持不同的过程站，可根据需要组合。目前控制器有AC 900F、AC 800F、AC 700F可供选择。
The Ethernet system bus links the individual stations with each other. This bus transmits the data between the process stations, the operator stations and the engineering station. Communication within the process station, i.e. data transmission between the CPU module and the connected modules, is realized via the internal station bus.
以太网系统连接各个站点。总线在过程站、操作员站、工程师站之间传输数据。站内通讯，也即CPU模板和链接模板之间的数据传输，是通过站内总线实现的。
Communication between the AC 900F process stations and operator/gateway stations as well as lateral communication between the AC 900F process stations can optionally be performed via a redundant Control Net.
AC 900F过程站和操作员/网关站之间的通讯，以及AC 900F过程站之间的横向通讯，都可以可选地通过冗余控制网执行。
Control Net redundancy is supported by the following Freelance process stations:
下列Freelance 过程站支持控制网络冗余：
- AC 900F
- AC 900F redundant
- AC 900F Lite
- AC 900F Lite redundant
- AC 900F Plus
- AC 900F Plus redundant
The following sections provide an overview of the currently available process stations. See the corresponding Mounting and Installation Instructions for more detailed information. Older hardware and process stations of previous system releases are also supported, but are not described in this manual. For information in this matter, see the manuals of the corresponding system releases.
以下部分概述了当前可用过程站。更多细节参见相应的安装说明。也支持以前系统发布的旧硬件和过程站，但本手册不支持。此事的更多信息，参阅相应系统发布手册。
1.1.1 AC 900F process station
AC 900F过程站
The AC 900F process station is available in two variants, namely Standard, Lite and Plus version.
AC 900F过程站有两个可用版本，命名为标准版，低配版和增强版。
The AC 900F Lite process station is designed for smaller lines:
AC 900F低配版过程站设计用于小型产线：
- there are only three instead of four Ethernet interfaces available,使用3个网口替代4个可用网口。
- the available memory capacity and the controller performance are lower than with the Standard version.可用内存容量和控制其性能低于标准版。
- it is recommended not to configure more than 400 I / O signals.建议配置的IO点数不要超过400个。
The AC 900F Plus process station is designed for larger lines:
AC 900F增强版过程站设计用大大型产线：
- four slots for fieldbus communication interfaces,四个现场总线通讯接口插槽。
- the available memory capacity and the controller performance are higher than with the Standard version.可用内存容量和控制器性能高于标准版本。
Details and technical data of the variants are included in the Mounting and Installation Instructions, AC 900F Controller.
各种细节和技术数据包含在《Mounting and Installation Instructions, AC 900F Controller.》（这个资料就是前面的练习连续学习翻译的那本）
The descriptions in the present document generally apply to all variants; differences are explicitly specified, where applicable.
本文件的说明一般适用于所有变型;差异在适用时明确指定。
The AC 900F process station in the Standard version exhibits the following basic features:
标准版的AC 900F展示了下列特征：
- PM 902F CPU module with
PM 902F CP模板包含
–four Ethernet interfaces,四个以太网接口
–one diagnostic interface,一个诊断接口
–two serial interfaces,两个串口
–one display unit (optional),一个显示单元
–max. two fieldbus communication interfaces (PROFIBUS and/or CAN for Rack-I/O),最大两个现场总线通讯接口（几家安装IO的Profibus 和/或 CAN）
–up to ten directly connected I/O modules with I/O terminal units. 通过IO终端单元，最多10个直接连接IO模板。
The AC 900F process station in the Plus version exhibits the following basic features:
AC 900F增强版过程站展示了一下基本特征：
- PM 904F CPU module with
PM 904F CPU模板包含
–four Ethernet interfaces, 四个以太网接口。
–one diagnostic interface, 一个诊断接口。
–two serial interfaces, 两个串口
–one display unit (optional), 一个显示单元
–max. four fieldbus communication interfaces (PROFIBUS and/or CAN for Rack-I/O), 最大四个现场总线通讯接口（几家安装IO的Profibus 和/或 CAN）
–up to ten directly connected I/O modules with I/O terminal units. 通过IO终端单元，最多10个直接连接IO模板。
The AC 900F process station in the Lite version exhibits the following basic features:
AC 900F低配版过程站展示了一下基本特征：
- PM 901F CPU module with
PM 901F CPU模板包含
–three Ethernet interfaces, 三个以太网接口。
–one diagnostic interface, 一个诊断接口。
–two serial interfaces, 两个串口。
–one display unit (optional), 一个显示单元。
–max. two fieldbus communication interfaces (PROFIBUS and/or CAN for Rack-I/O), 最大两个现场总线通讯接口（几家安装IO的Profibus 和/或 CAN）
–up to ten directly connected I/O modules with I/O terminal units. 通过IO终端单元，最多10个直接连接IO模板。
Depending on the type and quantity of process signals, up to ten plug-in type input/output modules can be directly connected. Additionally, two (PM 901F /PM 902F) or four (PM 904F) extensive PROFIBUS lines can be connected via two/four PROFIBUS modules. The CAN module (max. one per controller) allows connection of a maximum of 5 rack I/O units and thus the connection of 45 I/O modules as used in the rack-based Freelance process stations.
依据过程信号的类型和数量，最多可以直接连接10个输入/输出模板。另外，通过2个/4个PROFIBUS模板，可以连接2个（PM 901F/PM 902F）或者4个（PM 904F)扩展PROFIBUS线路。CAN模板（每个控制器最多1个）允许最多5个I/O机架IO单元，因此可以连接45个基于机架的freelance过程站使用的I/O模块。
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In a redundant AC 900F controller, the CI 930F and CI 773F PROFIBUS
modules respectively the CI 910F CAN module can be used. The CM 772F
PROFIBUS module does not support the redundancy mode.
在冗余AC 900F控制器中，CI 930F和CI 773F PROFIBUS模板分别使用CI 910F CAN模块。
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