西门子 S7 系列协议深度科普

DreamLife☼2026-09-12 8:53

西门子 S7 系列协议深度科普

文章目录

  • [**西门子 S7 系列协议深度科普**](#西门子 S7 系列协议深度科普)
    • 摘要
    • [1. 概述](#1. 概述)
    • [2. 协议分层架构](#2. 协议分层架构)
    • [3. 现场总线层协议（PROFINET & PROFIBUS）](#3. 现场总线层协议（PROFINET & PROFIBUS）)
      • [3.0 现场总线在自动化金字塔中的位置](#3.0 现场总线在自动化金字塔中的位置)
      • [3.1 PROFINET（PN）](#3.1 PROFINET（PN）)
      • [3.2 PROFIBUS DP（DP）](#3.2 PROFIBUS DP（DP）)
      • [3.3 PROFINET vs PROFIBUS DP 对比](#3.3 PROFINET vs PROFIBUS DP 对比)
    • [4. 串口现场层协议](#4. 串口现场层协议)
      • [4.1 PPI（Point-to-Point Interface）](#4.1 PPI（Point-to-Point Interface）)
      • [4.2 PPI OverTcp](#4.2 PPI OverTcp)
      • [4.3 MPI（Multi-Point Interface）](#4.3 MPI（Multi-Point Interface）)
    • [5. 以太网控制层协议](#5. 以太网控制层协议)
      • [5.1 S7 Communication（S7 协议）](#5.1 S7 Communication（S7 协议）)
      • [5.2 S7-PLUS](#5.2 S7-PLUS)
    • [6. 信息管理层协议](#6. 信息管理层协议)
      • [6.1 SIE Fetch/Write](#6.1 SIE Fetch/Write)
      • [6.2 SIE WebApi](#6.2 SIE WebApi)
    • [7. 网关/服务器层协议](#7. 网关/服务器层协议)
      • [7.1 S7 Virtual Server](#7.1 S7 Virtual Server)
      • [7.2 S7 PPI Server](#7.2 S7 PPI Server)
      • [7.3 SIE Fetch Write Server](#7.3 SIE Fetch Write Server)
    • [8. PLC 系列与协议支持矩阵](#8. PLC 系列与协议支持矩阵)
    • [9. 协议技术对比](#9. 协议技术对比)
    • [10. 协议演进时间线](#10. 协议演进时间线)
    • [11. 应用场景与选型建议](#11. 应用场景与选型建议)
      • [11.1 场景决策树](#11.1 场景决策树)
      • [11.2 具体建议](#11.2 具体建议)
    • [12. 开发注意事项](#12. 开发注意事项)
      • [12.1 常见坑点](#12.1 常见坑点)
      • [12.2 端口速查](#12.2 端口速查)
    • [13. 总结](#13. 总结)

关键字： 工业知识点、 ISO-on-TCP、 WebAPI 、 串口时代、 工业以太网时代 、 PROFINET 、 PROFIBUS

摘要

本文系统梳理西门子 S7 PLC 生态中涉及的通信协议，覆盖从早期串口到现代以太网的全协议栈，适用于工业自动化集成与协议开发参考。

1. 概述

西门子 S7 系列 PLC 的通信协议经历了从 串口时代 （PPI/MPI）到 工业以太网时代 （S7 Communication / ISO-on-TCP）再到 现代 Web 化（WebAPI / OPC UA）的演进。不同代际的 PLC（S7-200/300/400/1200/1500）支持的协议差异显著，理解这些协议的层级关系、适用场景和技术细节，是进行 PLC 集成开发的基础。

重要区分 ：西门子的协议生态其实分为两条相对独立的链路------

  1. 上位机/工程链路 （"控制器之上"）：PG/PC、SCADA、MES、编程器如何访问 PLC 内部的变量、数据块和程序。属于这一类的有 PPI、MPI、S7 Communication、Fetch/Write、WebApi ，以及虚拟化测试用的 Virtual Server / PPI Server / Fetch Write Server。
  2. 现场总线/实时 I/O 链路 （"控制器之下"）：PLC 如何与现场设备（远程 IO 站、伺服、变频器、传感器、执行器）进行实时循环数据交换。属于这一类的有 PROFINET（PN） 和 PROFIBUS DP（DP）。

本文同时覆盖这两条链路，以便形成完整的协议地图。
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通信协议族
现场总线层
PROFINET
PROFIBUS DP
串口现场层
PPI
PPI OverTcp
MPI
以太网控制层
S7 Communication
S7-PLUS
ISO-on-TCP
TCP/IP Raw
信息管理层
Fetch/Write
SIE WebApi
网关服务层
S7 Virtual Server
S7 PPI Server
SIE Fetch Write Server

2. 协议分层架构

西门子通信协议可按 OSI 参考模型进行分层映射。上图为"上位机链路"的映射；现场总线链路（PROFINET / PROFIBUS DP）的映射见第 3 章。
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数据链路层 (Layer 2)
网络层 (Layer 3)
传输层 (Layer 4)
表示层/会话层 (L5-L6)
应用层 (Layer 7)
SIE WebApi
Fetch/Write
S7 Communication

S7-PLUS
PG/OP Communication
PROFINET IO

应用服务
PROFIBUS DP

DP-V0/V1/V2
S7 Protocol

TASP / TSAP
HTTP/REST
PROFINET

RT / IRT
TCP Port 102
TCP Port 80/443
ISO Transport

RFC 1006
UDP

PROFINET RT 帧
IP
PROFINET RT

直通 L2，跳过 IP
Ethernet

IEEE 802.3
PROFIBUS

RS-485
PROFINET

EtherType 0x8892
RJ-45 / 光纤
RS-485

3. 现场总线层协议（PROFINET & PROFIBUS）

这一层是西门子自动化金字塔的实时 I/O 主干，解决"PLC 如何控制现场设备"的问题。它与前面讲的"上位机如何访问 PLC"是完全不同的两件事，但在很多集成项目中两者会同时出现。

3.0 现场总线在自动化金字塔中的位置

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现场总线层 (实时 I/O 链路)
PLC 控制器
控制层 (上位机链路)
信息管理层
企业层 (ERP)
ERP / MES 系统
SCADA / HMI
WebApi / OPC UA
S7 Communication

Fetch/Write

PPI/MPI
S7-300/400/1200/1500
PROFINET
PROFIBUS DP
远程 IO 站

ET 200
伺服 / 变频器

G120 / S120
传感器 / 执行器

3.1 PROFINET（PN）

属性 说明
全称 Process Field Network（工业以太网标准）
标准 IEC 61158 / IEC 61784-2（开放标准，非西门子私有）
物理层 标准以太网（RJ-45 铜缆 / 光纤）
速率 100 Mbit/s（标准）、1 Gbit/s（PROFINET 2.x）
组织 由 PROFIBUS & PROFINET International（PI）管理
特点 实时性分级、与 IT 网络兼容、灵活拓扑

PROFINET 是西门子与 PI 组织联合推动的开放工业以太网标准，是现代西门子自动化系统的实时通信主干。它直接跑在标准以太网之上，天然支持与 IT 网络融合，并针对不同实时性需求提供了三个通信等级。

PROFINET 的三个通信等级：

等级 全称 循环周期 典型应用
NRT Non-Real-Time >100 ms 参数配置、诊断、Web 服务
RT Real-Time 1--10 ms 标准 I/O 循环数据
IRT Isochronous Real-Time <1 ms（抖动 <1 μs） 运动控制、高精度同步

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实时性递增
实时性递增
非实时 NRT

TCP/UDP/IP

配置与诊断
实时 RT

跳过 IP 层

EtherType 0x8892
等时同步 IRT

硬件时间片

专用 ASIC

PROFINET 关键组件：

  • IO Controller（控制器）：通常由 S7 PLC 担任，发起循环数据交换
  • IO Device（设备）：如 ET 200 远程 IO、G120 变频器、S120 伺服
  • IO Supervisor（监视器）：PG/PC 编程器，用于工程组态和诊断

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循环数据 RT/IRT
循环数据 RT/IRT
组态/诊断 NRT
S7-1500

IO Controller
ET 200SP

IO Device
G120 变频器

IO Device
S120 伺服

IO Device
PG/PC 编程器

IO Supervisor

PROFINET 设备命名：
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映射
绑定
设备名

device-1

形如 et200sp-1
IP 地址

由控制器分配
MAC 地址

物理地址

PROFINET 设备以**设备名（Device Name）**而非 IP 作为逻辑标识，控制器通过 DCP（Discovery and Configuration Protocol）发现设备并分配 IP，这比手动配 IP 更便于工程维护。

3.2 PROFIBUS DP（DP）

属性 说明
全称 Decentralized Periphery（分布式外设）
标准 IEC 61158 / EN 50170（开放标准）
物理层 RS-485（铜缆）/ 光纤
速率 9.6 kbps -- 12 Mbps
拓扑 总线型，最多 126 站（每段 32 站）
主从 主站 + 从站，令牌传递
特点 传统现场总线之王，稳定可靠

PROFIBUS DP 是 1990 年代兴起的经典现场总线标准，至今仍在大量存量工厂中广泛运行。它采用主从 + 令牌传递机制，主站（通常是 PLC 的 DP 口或 CP 模块）周期性轮询从站（ET 200、变频器等）。

DP 协议版本演进：

版本 新增能力
DP-V0 基本循环数据交换（读/写 I/O）
DP-V1 非循环数据交换（参数化、诊断、报警）
DP-V2 等时同步、时钟同步、从站间通信

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DP 主站

S7-300 内置 DP 口

或 CP 342-5
ET 200M

从站
ET 200S

从站
MM 变频器

从站
S7-200 + EM277

从站

3.3 PROFINET vs PROFIBUS DP 对比

维度 PROFINET PROFIBUS DP
物理层 标准以太网（RJ-45/光纤） RS-485 / 光纤
速率 100 Mbps / 1 Gbps 最高 12 Mbps
拓扑 星型/树型/环型/线型（灵活） 严格总线型
实时性 RT / IRT（<1ms） 等时同步（DP-V2）
与 IT 集成 天然兼容 TCP/IP 需网关（PROFIBUS-to-PROFINET）
节点数量 理论上无上限 每段 32 站，最多 126 站
年代 2000s 至今（主流方向） 1990s（存量市场为主）
接线 标准网线，成本低 专用紫色电缆，成本高
诊断能力 丰富（Web/SNMP/LLDP） 有限

#mermaid-svg-e48D3kwTGTeaJXEE{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-e48D3kwTGTeaJXEE .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-e48D3kwTGTeaJXEE .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-e48D3kwTGTeaJXEE .error-icon{fill:#552222;}#mermaid-svg-e48D3kwTGTeaJXEE .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-e48D3kwTGTeaJXEE .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-e48D3kwTGTeaJXEE .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-e48D3kwTGTeaJXEE .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-e48D3kwTGTeaJXEE .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-e48D3kwTGTeaJXEE .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-e48D3kwTGTeaJXEE .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-e48D3kwTGTeaJXEE .marker{fill:#333333;stroke:#333333;}#mermaid-svg-e48D3kwTGTeaJXEE .marker.cross{stroke:#333333;}#mermaid-svg-e48D3kwTGTeaJXEE svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-e48D3kwTGTeaJXEE p{margin:0;}#mermaid-svg-e48D3kwTGTeaJXEE .label{font-family:"trebuchet ms",verdana,arial,sans-serif;color:#333;}#mermaid-svg-e48D3kwTGTeaJXEE .cluster-label text{fill:#333;}#mermaid-svg-e48D3kwTGTeaJXEE .cluster-label span{color:#333;}#mermaid-svg-e48D3kwTGTeaJXEE .cluster-label span p{background-color:transparent;}#mermaid-svg-e48D3kwTGTeaJXEE .label text,#mermaid-svg-e48D3kwTGTeaJXEE span{fill:#333;color:#333;}#mermaid-svg-e48D3kwTGTeaJXEE .node rect,#mermaid-svg-e48D3kwTGTeaJXEE .node circle,#mermaid-svg-e48D3kwTGTeaJXEE .node ellipse,#mermaid-svg-e48D3kwTGTeaJXEE .node polygon,#mermaid-svg-e48D3kwTGTeaJXEE .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-e48D3kwTGTeaJXEE .rough-node .label text,#mermaid-svg-e48D3kwTGTeaJXEE .node .label text,#mermaid-svg-e48D3kwTGTeaJXEE .image-shape .label,#mermaid-svg-e48D3kwTGTeaJXEE .icon-shape .label{text-anchor:middle;}#mermaid-svg-e48D3kwTGTeaJXEE .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-e48D3kwTGTeaJXEE .rough-node .label,#mermaid-svg-e48D3kwTGTeaJXEE .node .label,#mermaid-svg-e48D3kwTGTeaJXEE .image-shape .label,#mermaid-svg-e48D3kwTGTeaJXEE .icon-shape .label{text-align:center;}#mermaid-svg-e48D3kwTGTeaJXEE .node.clickable{cursor:pointer;}#mermaid-svg-e48D3kwTGTeaJXEE .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-e48D3kwTGTeaJXEE .arrowheadPath{fill:#333333;}#mermaid-svg-e48D3kwTGTeaJXEE .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-e48D3kwTGTeaJXEE .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-e48D3kwTGTeaJXEE .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-e48D3kwTGTeaJXEE .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-e48D3kwTGTeaJXEE .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-e48D3kwTGTeaJXEE .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-e48D3kwTGTeaJXEE .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-e48D3kwTGTeaJXEE .cluster text{fill:#333;}#mermaid-svg-e48D3kwTGTeaJXEE .cluster span{color:#333;}#mermaid-svg-e48D3kwTGTeaJXEE div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-e48D3kwTGTeaJXEE .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-e48D3kwTGTeaJXEE rect.text{fill:none;stroke-width:0;}#mermaid-svg-e48D3kwTGTeaJXEE .icon-shape,#mermaid-svg-e48D3kwTGTeaJXEE .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-e48D3kwTGTeaJXEE .icon-shape p,#mermaid-svg-e48D3kwTGTeaJXEE .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-e48D3kwTGTeaJXEE .icon-shape .label rect,#mermaid-svg-e48D3kwTGTeaJXEE .image-shape .label rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-e48D3kwTGTeaJXEE .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-e48D3kwTGTeaJXEE .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-e48D3kwTGTeaJXEE :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} 过渡策略
DP
PN
存量 PROFIBUS DP

老设备
PN/DP 网关

IE/PB Link
新 PROFINET

网络

工程实践 ：新项目普遍直接采用 PROFINET；存量 PROFIBUS DP 工厂在升级时，常通过 IE/PB Link 网关把 DP 网段接入 PROFINET 主干，实现平滑过渡，而非一次性替换所有设备。

4. 串口现场层协议

4.1 PPI（Point-to-Point Interface）

属性 说明
全称 Point-to-Point Interface
物理层 RS-485，187.5 kbit/s
应用对象 S7-200 / S7-200 SMART
拓扑 主从式，单主站或多主站
特点 西门子专为 S7-200 设计的轻量级协议，基于 RS-485 电气标准

PPI 是西门子 S7-200 系列的核心通信协议。它基于 RS-485 物理层，采用主从轮询机制。在单主站模式下，一个上位机（PG/PC）通过 PPI 电缆与 PLC 通信；在多主站模式下，多个主站设备可以共享总线。

数据帧结构：

复制代码 
+--------+--------+--------+--------+--------+--------+--------+
|  SD    |  DA    |  SA    |  FC    |  DATA  |  FCS   |  ED    |
| (1B)   | (1B)   | (1B)   | (1B)   | (nB)   | (1B)   | (1B)   |
+--------+--------+--------+--------+--------+--------+--------+
  SD=Start Delimiter (0x10 或 0x68)
  DA=Destination Address
  SA=Source Address
  FC=Function Code
  FCS=Frame Check Sequence
  ED=End Delimiter (0x16)

4.2 PPI OverTcp

属性 说明
本质 PPI 协议的 TCP 透传封装
用途 通过以太网网关/串口服务器远程访问 PPI 设备
典型场景 S7-200 通过串口服务器接入以太网
端口 通常为 102 或其他自定义端口

PPI OverTcp 并非西门子官方原生协议，而是第三方设备（如串口服务器、协议网关）将 PPI 报文封装在 TCP 载荷中进行传输的方案。它使得仅有 RS-485 PPI 接口的 S7-200 可以通过以太网进行远程通信。
S7-200 PLC 串口服务器/网关 上位机 S7-200 PLC 串口服务器/网关 上位机 #mermaid-svg-R9ObgmIKd5kRWbWv{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-R9ObgmIKd5kRWbWv .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-R9ObgmIKd5kRWbWv .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-R9ObgmIKd5kRWbWv .error-icon{fill:#552222;}#mermaid-svg-R9ObgmIKd5kRWbWv .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-R9ObgmIKd5kRWbWv .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-R9ObgmIKd5kRWbWv .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-R9ObgmIKd5kRWbWv .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-R9ObgmIKd5kRWbWv .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-R9ObgmIKd5kRWbWv .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-R9ObgmIKd5kRWbWv .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-R9ObgmIKd5kRWbWv .marker{fill:#333333;stroke:#333333;}#mermaid-svg-R9ObgmIKd5kRWbWv .marker.cross{stroke:#333333;}#mermaid-svg-R9ObgmIKd5kRWbWv svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-R9ObgmIKd5kRWbWv p{margin:0;}#mermaid-svg-R9ObgmIKd5kRWbWv .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-R9ObgmIKd5kRWbWv text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-R9ObgmIKd5kRWbWv .actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-R9ObgmIKd5kRWbWv .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-R9ObgmIKd5kRWbWv .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-R9ObgmIKd5kRWbWv .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-R9ObgmIKd5kRWbWv #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-R9ObgmIKd5kRWbWv .sequenceNumber{fill:white;}#mermaid-svg-R9ObgmIKd5kRWbWv #sequencenumber{fill:#333;}#mermaid-svg-R9ObgmIKd5kRWbWv #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-R9ObgmIKd5kRWbWv .messageText{fill:#333;stroke:none;}#mermaid-svg-R9ObgmIKd5kRWbWv .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-R9ObgmIKd5kRWbWv .labelText,#mermaid-svg-R9ObgmIKd5kRWbWv .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-R9ObgmIKd5kRWbWv .loopText,#mermaid-svg-R9ObgmIKd5kRWbWv .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-R9ObgmIKd5kRWbWv .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-R9ObgmIKd5kRWbWv .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-R9ObgmIKd5kRWbWv .noteText,#mermaid-svg-R9ObgmIKd5kRWbWv .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-R9ObgmIKd5kRWbWv .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-R9ObgmIKd5kRWbWv .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-R9ObgmIKd5kRWbWv .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-R9ObgmIKd5kRWbWv .actorPopupMenu{position:absolute;}#mermaid-svg-R9ObgmIKd5kRWbWv .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 / 0.4));}#mermaid-svg-R9ObgmIKd5kRWbWv .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-R9ObgmIKd5kRWbWv .actor-man circle,#mermaid-svg-R9ObgmIKd5kRWbWv line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-R9ObgmIKd5kRWbWv :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} TCP 连接建立 PPI 报文封装在 TCP 载荷中 解封为 RS-485 PPI 帧 PPI 响应 TCP 封装响应

4.3 MPI（Multi-Point Interface）

属性 说明
全称 Multi-Point Interface
物理层 RS-485，187.5 kbit/s（默认），最高 12 Mbit/s
应用对象 S7-300 / S7-400 / 早期 S7-200
拓扑 总线型，最多 32 个节点
特点 支持 PG/OP 通信、S7 通信、全局数据通信

MPI 是比 PPI 更强大的串口协议，主要用于 S7-300/400 系列。它不仅仅是点对点接口，而是真正的多点总线。MPI 网络支持：

  • PG/OP 通信：编程器/操作面板与 PLC 的通信
  • S7 基本通信（S7 Basic Communication）：PLC 之间的数据交换
  • 全局数据（Global Data）：周期性广播式数据交换

MPI 网络中每个节点需要唯一的 MPI 地址（0-31）。地址 0 通常保留给编程器。
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RS-485
编程器

MPI=0
操作面板

MPI=1
S7-300

MPI=2
S7-300

MPI=3
S7-400

MPI=4

5. 以太网控制层协议

5.1 S7 Communication（S7 协议）

属性 说明
基于 ISO-on-TCP（RFC 1006）或原生 TCP
默认端口 TCP 102
应用对象 S7-300/400/1200/1500
OSI 层级 应用层协议

S7 Communication 是西门子最核心的以太网通信协议，通常被称为 "S7 协议"。它承载在 ISO-on-TCP（RFC 1006）之上，使用 TCP 102 端口。

协议栈：
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应用层协议
ISO Transport

ISO 8073 Class 0
TCP

RFC 793
IP
Ethernet

S7 协议 PDU 结构：

复制代码 
TPKT Header (4B) + COTP Header (3-5B) + S7 Header (10-12B) + S7 Parameter + S7 Data

TPKT Header:
  +--------+--------+--------+--------+
  |  vrs   | reserve|      length      |
  |  0x03  |  0x00  |   (Big Endian)   |
  +--------+--------+--------+--------+

COTP Header (Connection Oriented Transport Protocol):
  +--------+--------+--------+
  | length |  PDU type  | ... |
  +--------+--------+--------+

S7 Header:
  +--------+--------+--------+--------+
  | 0x32   | type   | reserve|  req_id |
  +--------+--------+--------+--------+
  |     param_len     |      data_len   |
  +--------+--------+--------+--------+
  |           error_code (optional)       |
  +--------+--------+--------+--------+

S7 协议功能码：

功能码 含义 说明
0x04 Read 读取数据块/寄存器
0x05 Write 写入数据块/寄存器
0x1A Request Download 请求下载程序
0x1B Download Block 下载程序块
0x1C Download Ended 下载结束
0x1D Start Upload 开始上传
0x1E Upload 上传程序块
0x1F End Upload 上传结束
0x28 PLC Control 启动/停止/复位 PLC
0x29 PLC Stop 停止 PLC

5.2 S7-PLUS

属性 说明
本质 S7 Communication 的扩展/增强版本
面向对象 S7-1500 高级功能
新增能力 更大 PDU、优化数据传输、安全通信

S7-PLUS 并非一个独立协议，而是指 S7-1500 系列在标准 S7 通信基础上的增强能力集合：

  • 更大 PDU 尺寸：S7-1500 支持最大 64KB 的 PDU，相比 S7-300/400 的 240-480 字节大幅提升
  • 优化块访问：针对 S7-1500 的优化 DB（Optimized DB）提供更快的数据访问
  • 通信负载优化：支持更高效的批量数据传输

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S7-1200
S7-300/400
演进
演进
S7 Protocol

PDU ≤ 480B
S7 Protocol

PDU ≤ 4KB
S7-PLUS

PDU ≤ 64KB

6. 信息管理层协议

6.1 SIE Fetch/Write

属性 说明
全称 Siemens Fetch / Write Protocol
基于 ISO-on-TCP 或原生 TCP
默认端口 TCP 102（与 S7 协议共享端口）
应用对象 S7-300/400（带以太网 CP）/ S7-1500
特点 面向第三方系统的标准化数据交换接口

Fetch/Write 是西门子提供的一种第三方系统访问接口，允许非西门子设备（如 PC、SCADA、MES 系统）直接读写 PLC 内存区域。与 S7 协议相比，Fetch/Write 更简单直接：

  • Fetch：从 PLC 读取数据
  • Write：向 PLC 写入数据

Fetch/Write 与 S7 协议的区别：

特性 S7 Communication Fetch/Write
协议复杂度 高（需会话管理） 低（无状态请求）
功能范围 完整（读/写/控制/诊断） 仅读/写
认证机制 会话建立 简单访问权限
适用场景 西门子生态内部 第三方系统集成
编程复杂度 中等 低

S7-300 + CP343 第三方系统 S7-300 + CP343 第三方系统 #mermaid-svg-rpPLYKiUr1l5C63u{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-rpPLYKiUr1l5C63u .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-rpPLYKiUr1l5C63u .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-rpPLYKiUr1l5C63u .error-icon{fill:#552222;}#mermaid-svg-rpPLYKiUr1l5C63u .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-rpPLYKiUr1l5C63u .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-rpPLYKiUr1l5C63u .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-rpPLYKiUr1l5C63u .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-rpPLYKiUr1l5C63u .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-rpPLYKiUr1l5C63u .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-rpPLYKiUr1l5C63u .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-rpPLYKiUr1l5C63u .marker{fill:#333333;stroke:#333333;}#mermaid-svg-rpPLYKiUr1l5C63u .marker.cross{stroke:#333333;}#mermaid-svg-rpPLYKiUr1l5C63u svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-rpPLYKiUr1l5C63u p{margin:0;}#mermaid-svg-rpPLYKiUr1l5C63u .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-rpPLYKiUr1l5C63u text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-rpPLYKiUr1l5C63u .actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-rpPLYKiUr1l5C63u .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-rpPLYKiUr1l5C63u .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-rpPLYKiUr1l5C63u .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-rpPLYKiUr1l5C63u #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-rpPLYKiUr1l5C63u .sequenceNumber{fill:white;}#mermaid-svg-rpPLYKiUr1l5C63u #sequencenumber{fill:#333;}#mermaid-svg-rpPLYKiUr1l5C63u #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-rpPLYKiUr1l5C63u .messageText{fill:#333;stroke:none;}#mermaid-svg-rpPLYKiUr1l5C63u .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-rpPLYKiUr1l5C63u .labelText,#mermaid-svg-rpPLYKiUr1l5C63u .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-rpPLYKiUr1l5C63u .loopText,#mermaid-svg-rpPLYKiUr1l5C63u .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-rpPLYKiUr1l5C63u .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-rpPLYKiUr1l5C63u .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-rpPLYKiUr1l5C63u .noteText,#mermaid-svg-rpPLYKiUr1l5C63u .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-rpPLYKiUr1l5C63u .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-rpPLYKiUr1l5C63u .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-rpPLYKiUr1l5C63u .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-rpPLYKiUr1l5C63u .actorPopupMenu{position:absolute;}#mermaid-svg-rpPLYKiUr1l5C63u .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 / 0.4));}#mermaid-svg-rpPLYKiUr1l5C63u .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-rpPLYKiUr1l5C63u .actor-man circle,#mermaid-svg-rpPLYKiUr1l5C63u line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-rpPLYKiUr1l5C63u :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} Fetch/Write 无状态通信 FETCH Request (DB Area, Offset, Length) FETCH Response (Data) WRITE Request (DB Area, Offset, Data) WRITE Response (Status)

内存寻址格式：

复制代码 
Fetch/Write 使用绝对地址寻址：
  DBX.DBW10   → DB1 的字 10
  MB100       → 位存储区字节 100
  IW64        → 输入字 64
  QW32        → 输出字 32

6.2 SIE WebApi

属性 说明
全称 Siemens Web API
基于 HTTP/REST + JSON
默认端口 80 / 443（HTTPS）
应用对象 S7-1200 FW 4.0+ / S7-1500
特点 现代 RESTful 接口，Web 原生

SIE WebApi 是西门子为新一代 PLC（S7-1200/1500）提供的 HTTP REST API，允许通过标准 Web 技术（HTTP/JSON）访问 PLC 数据。这是西门子向 IT/OT 融合迈出的重要一步。

核心功能：

  • 读取/写入 PLC 变量（支持符号寻址）
  • 读取/写入数据块
  • 调用 PLC 函数块（FB/FC）
  • 读取诊断信息
  • 读取 PLC 状态（RUN/STOP/ERROR）

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Web Browser
HTTP/REST
S7-1500

内置 Web Server
Mobile App
Python/JS Script
传统方式
OPC Client
OPC Server
S7 Protocol
S7-1500

WebApi 请求示例：

http 复制代码 
GET /api/plc/variable?path="MyDB".Temperature HTTP/1.1
Host: 192.168.1.10
Accept: application/json

Response:
{
  "value": 23.5,
  "dataType": "Real",
  "quality": "GOOD",
  "timestamp": "2024-01-15T08:30:00Z"
}

7. 网关/服务器层协议

7.1 S7 Virtual Server

属性 说明
本质 软件实现的 S7 协议服务器
功能 在 PC/服务器端模拟 S7 PLC 的行为
用途 测试、仿真、协议逆向分析
典型应用 HMI/SCADA 开发测试、协议学习

S7 Virtual Server 是一种软件模拟器，在标准计算机上运行，对外表现为一个真实的 S7 PLC。它接受 S7 协议的连接请求，响应读/写/控制命令，但底层数据来自软件模拟而非真实硬件。
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测试环境
S7 Protocol
S7 Protocol
WinCC / 组态王
SCADA 系统
S7 Virtual Server

运行于 PC

7.2 S7 PPI Server

属性 说明
本质 PPI 协议的软件服务器端实现
功能 在 PC 端模拟 S7-200 的 PPI 从站
用途 模拟 S7-200 设备、协议测试
连接方式 通过串口或串口服务器

S7 PPI Server 是 PPI 协议的虚拟化实现，允许在没有真实 S7-200 PLC 的情况下进行 PPI 通信测试。

7.3 SIE Fetch Write Server

属性 说明
本质 Fetch/Write 协议的软件服务器端
功能 在 PC/服务器端提供 Fetch/Write 服务端点
用途 数据采集网关、协议转换
典型场景 将非西门子设备数据以 Fetch/Write 格式暴露

Fetch Write Server 是一个中间层服务，它将底层设备数据封装为 Fetch/Write 协议格式，使得上层西门子生态的 HMI/SCADA 系统可以通过标准 Fetch/Write 接口访问数据。
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网关层
上层系统
Fetch/Write
Fetch/Write
Modbus
OPC UA
Custom
WinCC
第三方 SCADA
SIE Fetch Write Server
Modbus 设备
OPC UA 设备
自定义设备

8. PLC 系列与协议支持矩阵

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S7-300/400 系列
S7-200 系列
PPI
PPI / 以太网
S7 协议
MPI
以太网 CP
以太网 CP
DP 口
PN 口
MPI
以太网 CP
以太网 CP
DP 口
PN 口
原生以太网
原生以太网
PN 口
原生以太网
原生以太网
原生以太网
原生以太网
PN 口
S7-200
S7-200 SMART
S7-300
S7-400
S7-1200
S7-1500
PPI 协议
S7 Communication
MPI 协议
Fetch/Write
PROFIBUS DP
PROFINET
SIE WebApi
S7-PLUS 增强

详细支持矩阵：

协议 S7-200 S7-200 SMART S7-300 S7-400 S7-1200 S7-1500
PPI ✅ ✅ ❌ ❌ ❌ ❌
MPI ❌ ❌ ✅ ✅ ❌ ❌
S7 Communication ❌ ⚠️ ✅ ✅ ✅ ✅
S7-PLUS ❌ ❌ ❌ ❌ ❌ ✅
Fetch/Write ❌ ❌ ✅¹ ✅¹ ⚠️ ✅
WebApi ❌ ❌ ❌ ❌ ✅² ✅
PROFINET ❌ ❌ ✅³ ✅³ ✅ ✅
PROFIBUS DP ⚠️⁴ ❌ ✅⁵ ✅⁵ ⚠️⁶ ⚠️⁶

¹ 需配置以太网通信处理器（CP）

² S7-1200 FW 4.0 及以上版本支持

³ S7-300/400 需带 PN 口的 CPU 型号（如 315-2PN/DP）

⁴ S7-200 需加装 EM277 模块作为 DP 从站

⁵ S7-300/400 需带 DP 口的 CPU 型号（如 315-2DP）

⁶ S7-1200/1500 需加装 CM1242-5 / CM1542-5 通信模块

⚠️ 部分支持或有限支持

9. 协议技术对比

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演进
演进
并行
PPI

187.5 kbps

~30ms 响应
MPI

12 Mbps

~10ms 响应
S7 Ethernet

100/1000 Mbps

~1-5ms 响应
WebApi

100/1000 Mbps

~5-20ms 响应

维度 PPI MPI S7 Communication Fetch/Write WebApi
传输速率 187.5 kbps 12 Mbps 100/1000 Mbps 100/1000 Mbps 100/1000 Mbps
传输介质 RS-485 RS-485 Ethernet Ethernet Ethernet
网络拓扑 总线 总线 星型/环型 星型 星型
最大节点 32 32 理论无上限 理论无上限 理论无上限
实时性 低 中 高 高 中
协议复杂度 低 中 高 中 低
第三方兼容 差 差 中 好 好
安全机制 无 无 可选 简单 HTTPS/TLS
符号寻址 不支持 不支持 部分支持 不支持 支持

10. 协议演进时间线

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text{fill:lightgray;}#mermaid-svg-t2UfqXvzPxHAHMLN .disabled text{fill:#efefef;}#mermaid-svg-t2UfqXvzPxHAHMLN .section-root rect,#mermaid-svg-t2UfqXvzPxHAHMLN .section-root path,#mermaid-svg-t2UfqXvzPxHAHMLN .section-root circle{fill:hsl(240, 100%, 46.2745098039%);}#mermaid-svg-t2UfqXvzPxHAHMLN .section-root text{fill:#ffffff;}#mermaid-svg-t2UfqXvzPxHAHMLN .icon-container{height:100%;display:flex;justify-content:center;align-items:center;}#mermaid-svg-t2UfqXvzPxHAHMLN .edge{fill:none;}#mermaid-svg-t2UfqXvzPxHAHMLN .eventWrapper{filter:brightness(120%);}#mermaid-svg-t2UfqXvzPxHAHMLN :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} 1989 PROFIBUS DP 标准发布 经典现场总线兴起 1990s S7-300/400 发布 MPI 协议标准化 PROFIBUS 大规模应用 1998 S7-200 发布 PPI 协议成为入门级标准 2001 PROFINET 标准发布 工业以太网时代开启 2000s 以太网 CP 模块普及 S7 Communication 成熟 Fetch/Write 协议标准化 2004 S7-200 SMART 发布 保留 PPI + 新增以太网 2010s TIA Portal 推出 统一工程环境 2012 S7-1200 发布 原生以太网支持 Web Server 内置 内置 PROFINET 口 2013 S7-1500 发布 S7-PLUS 增强通信 更大 PDU / 更高性能 2014+ WebApi 逐步完善 IT/OT 融合趋势 OPC UA 整合 PROFINET 全面取代 PROFIBUS 西门子 S7 协议演进史

11. 应用场景与选型建议

11.1 场景决策树

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S7-300/400
S7-1200/1500
有 CP
无 CP
西门子生态
第三方系统
Web/移动
是
否
是
否
开始选型
目标 PLC 型号?
PPI 或以太网 S7
有无以太网 CP?
以太网优先
S7 / Fetch/Write
MPI
集成方式?
S7 Communication
需要 REST?
WebApi
Fetch/Write
有串口服务器?
PPI OverTcp
原生 PPI

11.2 具体建议

场景 推荐协议 理由
S7-200 编程调试 PPI 原生支持，成本最低
S7-200 远程监控 PPI OverTcp 通过网关扩展距离
S7-300/400 与 HMI S7 Communication 西门子生态最佳兼容
第三方 MES 对接 S7-300 Fetch/Write 协议简单，开发成本低
Web 可视化 S7-1200 WebApi 原生 HTTP/JSON，无需中间件
跨平台数据采集 S7-1500 WebApi / OPC UA 现代标准，安全可扩展
协议学习/逆向分析 Virtual Server 无硬件风险，可控环境
多协议网关开发 Fetch Write Server 统一接口封装
新建项目连接远程 IO/伺服 PROFINET 主流方向，布线简单，实时性好
存量 DP 工厂平滑升级 PN/DP 网关（IE/PB Link） 保护既有投资，逐步过渡
高速运动控制/同步 PROFINET IRT 等时同步，抖动 <1μs

12. 开发注意事项

12.1 常见坑点

  1. TSAP 配置 ：S7 通信需要正确配置本地和远程 TSAP（Transport Service Access Point），不同 PLC 型号默认值不同
    • S7-300/400 默认：03.02（机架 0，槽位 2）
    • S7-1200/1500 默认：03.01（机架 0，槽位 1）
  2. PDU 大小协商：连接建立时需要进行 PDU 大小协商，实际传输数据量不能超过协商值
  3. 优化块兼容性：S7-1200/1500 的优化 DB（Optimized DB）无法通过绝对地址访问，需使用符号寻址或 WebApi
  4. PPI 多主站限制：PPI 网络中若存在多个主站，需确保地址不冲突且轮询周期合理
  5. WebApi 安全：生产环境中务必启用 HTTPS 和访问控制，避免未授权访问 PLC
  6. PROFINET 设备名唯一性：同一 PROFINET 网络中设备名（Device Name）必须全局唯一，否则控制器无法正确识别设备
  7. PROFIBUS 终端电阻：DP 总线首末两端必须正确接入终端电阻（ON），中间站需置于 OFF，否则通信不稳定甚至中断
  8. DP 波特率一致性：PROFIBUS 网络中所有站点（主站与从站）的波特率必须一致，且与电缆长度匹配（12 Mbps 时最长 100m）

12.2 端口速查

协议 端口 传输层
S7 Communication TCP 102 ISO-on-TCP
Fetch/Write TCP 102 ISO-on-TCP
WebApi HTTP TCP 80 HTTP
WebApi HTTPS TCP 443 HTTPS
OPC UA TCP 4840 Binary / HTTPS

注 ：PROFINET 与 PROFIBUS DP 不使用传统 TCP 端口。PROFINET 实时帧直接承载于以太网二层（EtherType 0x8892），非实时通信（NRT）则走标准 UDP/TCP；PROFIBUS DP 基于 RS-485 物理层，无端口概念。

13. 总结

西门子 S7 协议族是一个层次分明、代际演进的通信体系，完整包含两条链路：

上位机/工程链路（访问 PLC 内部数据）：

  • PPI/MPI 代表了工业控制的串口时代，简单可靠但受限于物理层性能
  • S7 Communication 是西门子生态的核心协议，功能完整但实现复杂
  • Fetch/Write 是第三方集成的友好接口，平衡了功能与易用性
  • WebApi 代表了 IT/OT 融合的方向，让 PLC 数据访问像调用 REST API 一样简单
  • Virtual Server / PPI Server 等软件层协议降低了开发与测试的硬件门槛

现场总线/实时 I/O 链路（连接 PLC 与现场设备）：

  • PROFIBUS DP 是经典现场总线之王，存量工厂仍在广泛运行
  • PROFINET 是当前主流方向，以工业以太网承载 RT/IRT 实时通信，正在全面取代 PROFIBUS

理解这些协议的适用场景和技术边界，是进行西门子 PLC 集成开发的基础。新一代 S7-1200/1500 配合 WebApi 正在降低工业通信的门槛，S7-PLUS 为高性能场景提供更强大的底层支撑，而 PROFINET 则让控制层与信息层在网络基础设施上走向统一。

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