SIPOS 5 Flash
电动执行机构的 Modbus RTU接口
使用说明书
2007年2月版
? SIPOS Aktorik GmbH 2007
版权所有！ 订购号：E20185-P920-B706-X-5D00
内容
1
页码
安全须知······················································································································3 1.1 和安全有关的术语·····················································································································3 2
2.1 2.2 2.3
2.3.1 2.3.2 2.3.3 2.3.4 2.3.5
SIPOS 5 Flash电动执行机构的Modbus总线接口······················································3 概述··········································································································································3 Modbus总线接口······················································································································4 Modbus RTU – 基本功能··········································································································4 报文结构·······················································································································································4 Modbus串行通讯的消息帧···························································································································5 三种PDU类型 – 通讯过程·····························································································································5 数据模型·······················································································································································6 功能码 – 支持的服务····································································································································6 技术数据及功能···········································································································7 带Modbus RTU总线接口的SIPOS 5 Flash电动执行机构··························································7 带Modbus 总线接口的SIPOS 5 Flash电动执行机构 – 基本功能···············································8 带Modbus总线接口的SIPOS 5 Flash电动执行机构 – 附加的功能··········································10 电气连接（铜缆或光纤）········································································································11
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3.1 3.2 3.3 3.4
4
设置Modbus RTU的通讯参数···················································································13 4.1 Modbus RTU的通讯参数········································································································13 4.2 可选项∕设定工具···················································································································13 5
使用带Modbus 总线接口的SIPOS 5 Flash电动执行机构········································14 5.1 通过Modbus总线进行控制······································································································14 5.2 禁止就地控制单元···················································································································14 5.3 显示的故障信息（专业型PROFITRON）···············································································14 6
广播方式及安全功能··································································································15 6.1 广播信息·································································································································15 6.2 Modbus的安全功能·················································································································15 7 8
Modbus RTU的冗余型·····························································································15
连接状态和故障信号··································································································16 8.1 连接状态·································································································································16 8.2 总线通讯故障∕和校验故障····································································································16 9
参考文献····················································································································34
附录
A B C D E
输入寄存器······················································································································17-22 保持寄存器······················································································································23-30 离散量输入····························································································································31 线圈·······································································································································32 电报：“读取异常状态”，“报告从站标识”及“读取设备标识” ·····································33
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安全须知
警告标识，表明如果操作不正确，会影响人身或设备的安全。
1.1 和安全有关的术语
本手册描述了SIPOS 5 Flash电动执行机构的Modbus总线接口。你还可以在中文使用说明书E20185-P920-B701-X-5D00 （专业型PROFITRON）及E20185-P920-B700-X-5D00（经济型ECOTRON）中找到更多的关于SIPOS 5 Flash电动执行机构详细信息，包括电气和机械连接，参数设置和调试等。
出厂前，所有具有Modbus总线通讯能力的执行机构都预先安装了Modbus总线接口，并进行了测试。
本手册必须同执行机构相应的使用说明书结合在一起来使用。
当进行同执行机构有关的工作时，必须遵守包含在使用说明书中的安全准则。本手册只包含有Modbus总线接口的有关内容！
建议由SIPOS AKTORIK服务中心的服务和支持人员进行所有的计划、安装、调试和服务的工作。
2
2.1
SIPOS 5 Flash电动执行机构的Modbus总线接口
概述
? 关于Modbus RTU的一般知识
为了在自动化系统之间、自动化系统和所连接的分散的现场设备之间进行信息交换，如今串行现场总线被主要用作通讯系统。成千上万的应用已经强烈地证明了通过使用现场总线技术，可以节省多至40％的接线、调试及维护的费用。
仅仅使用两根电线就可以传送现场设备的所有相关信息，比如输入和输出数据、参数、诊断数据。过去使用的现场总线往往是制造商的特定现场总线，并且同其它现场总线不兼容。如今使用的现场总线几乎是完全公开和标准化的。这就意味者用户可以以最合理的价格选择最好的产品，而不用依赖于每个独立的制造商。
Modbus RTU是一种国际的、开放的现场总线标准。作为一种很容易实现的现场总线协议，在全世界范围内，Modbus得到了成功的应用。应用领域包括生产过程中的自动化、过程控制和楼宇自控。
? 基本特征
Modbus RTU决定了一个由它把分散的数字自动化设备连接在一起的、串行现场总线系统的技术和功能特点。它被设计成在现场级以极高的速度传递数据。这里的中央控制设备，比如PLC或PC机，通过有关高速的串行接口同外围的现场站进行开关量及∕或模拟量的输入输出数据通讯。
基本的是非循环通讯服务。
Modbus区别主站设备和从站设备。
主站设备 控制总线上的数据交换。主站被允许毋需一个外部请求就可以发送信息。
从站设备 诸如SIPOS 5 Flash电动执行机构等的外围设备。典型的从站设备是输入输出设备，阀门，执行机构和测量变送
器。它们不具备访问总线的能力，也就是说，它们仅仅可以确认已经接受到的信息，或者，在主站的要求下发送信息到主站。从站通常也被称作被动站。
一般适用下列规则：
o 在一条总线上，只允许有1个主站可以在工作状态（单主站总线系统）。 o 最多可以有247个从站被连接到一条总线上。
o 总是由主站启动通讯，从站只能是响应主站的请求。 o 保护特点：“和校验”及奇偶校验位。
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主站同现场设备（从站）的通讯有两种方式：
o 单独通讯方式 – 直接向一个特定的现场
设备发出请求。
（从站地址不能为“0”）：
“正常”操作：
主站向某个现场设备发出请求，该设备随后作出响应。
主站 请求响应 从站
从站
o 广播方式 – 针对所有现场设备的总的请
求。
（从站地址为“0”）：
主站发送一个请求（报文）给所有的总线站。例如，发送一个“紧急”命令，而不需要任何从站的响应。
更进一步的说明，请参考第6.1节。
从站
主站 请求从站
从站
从站
2.2 Modbus总线接口
? ? ? ? ?
1通道或2通道（冗余型）。
适用于所有的多回转、直行程或角行程电动执行机构，以及两种控制单元，经济型（ECOTRON）和专业型（PROFITRON）。 例外：不能同继电器板、直连式接线方式或带模拟量光电隔离接口结合在一起使用。 所有SIPOS 5执行机构的标准电气接口为RS485及光纤（FO）（参考第3.4节）。 随时可加装Modbus总线接口。 用户接口：
o 可以通过Modbus 现场总线对SIPOS 5 Flash进行参数设置和控制。
o 可以进行混合控制，例如： - 通过开关量∕模拟量输入进行控制，并且
- 通过现场总线进行“参数设置∕观察”。 ?
遵守Modbus电缆规范（参考第3.4节）。
2.3 Modbus RTU – 基本功能
2.3.1 报文结构
以串行数据传输为基础，通过一位接着一位进行传送。
协议数据单元（PDU）
Modbus PDU（协议数据单元）由功能码和实际数据两部分组成。
Modbus PDU功能码 数据
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2.3.2 Modbus串行通讯的消息帧
Modbus串行线
从站地址 1字节 功能码 1字节 数据区 0或多至252字节CRC校验 （循环冗余校验） 2字节 CRC 低位 CRC 高位 2.3.3 三种PDU类型 – 通讯过程
采用三种不同的通讯类型进行通讯。
请求 – 来自DCS∕控制器（主站）的请求。
响应 – 现场设备（从站）作出的无差错处理过程。
异常响应：现场设备将请求的原始功能码修改后（将最高位置位为逻辑1）返回；异常码含有差错类型信息。
通讯过程：
?
无差错
主站 发送请求 功能码 数据请求- 执行操作。 -发送响应。 功能码 数据响应 接受响应 ?
异常响应 发送请求 功能码 数据请求- 在操作中检测到差错。 - 发送异常响应。 异常功能码异常码 接受响应
异常响应的原因：
o 信息（请求报文）不完整。 ? 从站没有响应，异常响应计数器累计加1。 o 从站不支持信息中的请求。 ? 异常码。
o 从站处于故障状态，当前不能执行操作。 ? 异常码。
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MODBUS RTU 中文使用说明书 - 图文
