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工业通信协议百科

2026-09-04 分类：服务器技术 阅读(3) 评论(0)

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工业通信协议百科

文章目录

  • 工业通信协议百科
    • 摘要
  • 第一部分 · 工业通信的世界观
    • 1.1 为什么工业协议这么多
    • 1.2 自动化金字塔与协议分层
    • 1.3 OSI 七层模型与工业协议的"精简"
    • 1.4 协议的两大阵营
  • 第二部分 · 开放通用协议
    • 2.1 Modbus 家族：最简单、最开放的"万能胶"
      • 2.1.1 一句话核心认知
      • 2.1.2 八变体分层结构
      • 2.1.3 横评对比表
    • 2.2 现场总线 Fieldbus：模拟时代的"数字革命"
      • 2.2.1 PROFIBUS（DP/PA）
      • 2.2.2 HART：模拟信号上的"数字叠加"
      • 2.2.3 FOUNDATION Fieldbus（FF）：控制下放到现场
      • 2.2.4 其他现场总线速查
    • 2.3 工业以太网：把"确定性"做进以太网
      • 2.3.1 PROFINET：一个协议、三档性能
      • 2.3.2 EtherNet/IP：一套 CIP、多种介质
      • 2.3.3 EtherCAT：最快的工业以太网
      • 2.3.4 工业以太网横向对比
    • 2.4 信息集成层：OPC UA 与 MQTT
      • 2.4.1 OPC UA 的四大支柱
      • 2.4.2 OPC UA FX：向现场层进军
      • 2.4.3 MQTT / Sparkplug
  • 第三部分 · 厂商协议族
    • 3.1 西门子 Siemens：S7 协议族
      • 3.1.1 协议栈速查
      • 3.1.2 S7 Communication 协议栈
      • 3.1.3 关键坑点
    • 3.2 罗克韦尔 Rockwell / Allen-Bradley
      • 3.2.1 端口与寻址速查
      • 3.2.2 三代演进
      • 3.2.3 给驱动开发者的提示
    • 3.3 三菱 Mitsubishi：MC 协议族
      • 3.3.1 PLC 型号 → 推荐协议速查
      • 3.3.2 默认端口
    • 3.4 欧姆龙 Omron：FINS + HostLink
      • 3.4.1 FINS 报文结构
      • 3.4.2 选型建议
    • 3.5 倍福 Beckhoff：ADS + EtherCAT
      • 3.5.1 ADS 关键概念
    • 3.6 松下 Panasonic：Mewtocol + MC 3E + RTEX
      • 3.6.1 核心成员
      • 3.6.2 Mewtocol 帧结构
    • 3.7 基恩士 Keyence：MC-3E + Nano
      • 3.7.1 一句话结论
      • 3.7.2 关键坑
    • 3.8 汇川 Inovance：国产"自有 + 开放"双轨
      • 3.8.1 核心协议定位
      • 3.8.2 设备与协议支持矩阵（节选）
    • 3.9 DCS 厂商：骨干网私有协议
  • 第四部分 · 机器人通信协议
    • 4.1 机器人厂商私有协议
    • 4.2 应用层中间件：ROS / ROS 2 / DDS
  • 第五部分 · 横向对比与选型
    • 5.1 主流协议横向对比
    • 5.2 端口速查表
    • 5.3 选型决策总图
    • 5.4 按场景速查
  • 第六部分 · 趋势与总结
    • 6.1 三大趋势技术
      • 6.1.1 Ethernet-APL：以太网进防爆区
      • 6.1.2 TSN：让标准以太网"确定性"
      • 6.1.3 统一以太网愿景
    • 6.2 三点结论

关键字：
工业知识点、
EtherNet/IP、
EtherCAT、
OPC UA、
西门子
Modbus
PROFINET

摘要

从现场总线到工业以太网，从开放标准到厂商私有协议——一次讲清工业领域"设备之间如何对话"的完整语言体系。 本文整合 Modbus、PROFINET、EtherNet/IP、EtherCAT、OPC UA 等开放标准，以及西门子、罗克韦尔、三菱、欧姆龙、倍福、松下、基恩士、汇川、DCS 厂商、机器人厂商的私有协议族。

第一部分 · 工业通信的世界观

1.1 为什么工业协议这么多

一台工业设备（PLC、DCS、伺服、机器人、仪表）从来不是孤立运行的，它要和上位机、控制器、驱动器、传感器、MES/ERP 对话。但工业通信的需求是分裂的：

维度两端需求
实时性 伺服闭环要纳秒～微秒级，云端监控 100ms 也无妨
带宽 视觉点云要海量吞吐，一个开关量只要 1 bit
可靠性 联锁/安全回路要求确定性 + 冗余，采集可以容忍丢包
互操作 IT 侧早已统一到以太网/IP，现场侧却长期"诸侯割据"
生态/成本 厂商要锁定生态，用户要开放省钱

于是工业界形成了"一套需求，多套协议"的格局。理解它们，第一把钥匙是自动化金字塔分层。

1.2 自动化金字塔与协议分层

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L1 现场层 · 驱动器 / 远程 IO / 仪表 / 传感器

L2 控制层 · PLC / DCS 控制器 / 运动控制器

L3 监控层 · 操作员站 / 工程师站 / 历史站

L4 管理层 · ERP / MES / 厂级监控

OPC UA / MQTT / HTTP

S7 / FINS / MC / ADS / Modbus TCP / OPC UA

S7 / FINS / MC / ADS / Modbus TCP / OPC UA

S7 / FINS / MC / ADS / Modbus TCP / OPC UA

S7 / FINS / MC / ADS / Modbus TCP / OPC UA

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

PROFINET / EtherCAT / EtherNet/IP / CC-Link

ERP / MES / SIS

SCADA / HMI / OPC UA Server

西门子 S7

罗克韦尔 Logix

三菱 MELSEC

倍福 TwinCAT

变频器 / 伺服

远程 IO 站

变送器 / 传感器

记忆口诀：

  • 上层（L3/L4）偏向 IT：TCP/IP、HTTP、OPC UA、MQTT，关心"含义"与"语义互操作"；
  • 下层（L1/L2）偏向 OT：实时确定性、循环周期、抖动，关心"快且准"。

1.3 OSI 七层模型与工业协议的"精简"

工业协议不一定遵守完整七层，很多为了实时性故意"跳过"部分层——这是理解协议差异的第二把钥匙。

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对应

工业协议分层对应

OPC UA / MQTT / S7Comm / FINS / MC / RAPID（应用层语义）

CIP / PROFINET IO / CANopen DS-402（应用协议 + 设备行规）

TCP / UDP / RTPS / TCPROS（传输层）

IP（部分协议保留）EtherCAT / PROFINET IRT 为实时性跳过

Ethernet / CAN / RS-485 / 光纤（数据链路 + 物理层）

ISO/OSI 参考模型

7 应用层 Application

6 表示层 Presentation

5 会话层 Session

4 传输层 Transport

3 网络层 Network

2 数据链路层 Data Link

1 物理层 Physical

关键结论：

  • EtherCAT / PROFINET IRT / SERCOS III：为实现微秒级确定性，绕开 TCP/IP 栈，直接在以太网帧上做"实时通道"，因此不能直接穿过普通交换机/路由器（需专用从站芯片 ESC 或 TSN 交换机）。
  • EtherNet/IP / Modbus TCP / PROFINET RT（软实时）：保留 TCP/UDP + IP，可复用标准以太网硬件，但实时性弱于前一类。
  • 这一"是否保留 IP 栈"的差异，几乎决定了协议在实时性 vs 通用性上的取舍。

1.4 协议的两大阵营

按技术路线，工业通信协议可分为两大阵营：

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工业通信协议

现场总线 Fieldbus

PROFIBUS DP / PA

HART

FOUNDATION Fieldbus FF

Modbus RTU / ASCII

CANopen

DeviceNet

CC-Link

AS-i

SERCOS I/II

工业以太网 Industrial Ethernet

PROFINET RT / IRT

EtherNet/IP CIP

EtherCAT

Modbus TCP

POWERLINK

CC-Link IE

SERCOS III

信息集成与互操作

OPC UA / OPC UA FX

MQTT / Sparkplug

厂商私有协议

西门子 S7Comm

罗克韦尔 DF1 / PCCC

三菱 MC / FX

欧姆龙 FINS / HostLink

倍福 ADS

松下 Mewtocol / RTEX

基恩士 Nano / MC-3E

汇川 InovanceSerial / EasyNet

DCS 骨干网 FTE / Vnet/IP

核心矛盾：现场层协议长期"诸侯割据"，IT 侧早已统一到以太网/IP。行业的长期方向，就是"以太网一网到底"——这将在第六部分展开。

第二部分 · 开放通用协议

开放通用协议是跨厂商互通的"普通话"。这一部分从最老的 Modbus 讲起，一直到最上层的 OPC UA。

2.1 Modbus 家族：最简单、最开放的"万能胶"

2.1.1 一句话核心认知

Modbus 的 8 个变体，本质是「同一应用层 PDU（功能码 + 数据）的不同封装形态」。变的只是物理层 / 链路层 / 传输层，不变的是那颗"Modbus 心"。

所有 Modbus 设备都暴露四类对象：

名称别名读写典型用途
Coil 线圈 / DO 读写 继电器、阀门、开关量输出
Discrete Input DI 只读 按钮、限位、状态位输入
Holding Register HR / AO 读写 设定值、参数、控制字
Input Register IR 只读 测量值、传感器数据

通用功能码跨变体一致：0x01 读线圈、0x02 读离散输入、0x03 读保持寄存器、0x04 读输入寄存器、0x05/0x0F 写线圈、0x06/0x10 写寄存器。异常响应 = 0x80 + FC。

2.1.2 八变体分层结构

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Modbus PDU（应用层）Function Code + Data（与变体无关）

Modbus RTU串口·二进制·CRC-16

Modbus ASCII串口·ASCII·LRC

Modbus TCP以太网·TCP 502·MBAP 头

Modbus UDP以太网·UDP 502

Modbus Server角色层概念

RTU over TCP串口服务器透传

ASCII over TCP

2.1.3 横评对比表

变体介质校验帧头开销节点数默认端口现状
Modbus RTU RS-232/485 CRC-16 4B 247 串口 主流
Modbus ASCII RS-232/485 LRC 7B+CRLF 247 串口 遗留
Modbus TCP 以太网 TCP 内置 7B MBAP 几乎无限 TCP 502 主流
Modbus UDP 以太网 UDP 无 7B MBAP 几乎无限 UDP 502 边缘
RTU over TCP 以太网 TCP+CRC 仅 TCP 247/连接 自定义 串口服务器标配

选型原则：看物理介质和设备规格书——同一种 PDU 走不同路，只影响你选择的库和帧头边界，业务语义完全一样。

调试 Top 坑：① 协议地址 vs 数据手册地址差 1；② 32 位/浮点寄存器的字节序拼接；③ RTU 帧间隔（3.5 字符时间）没设好；④ 走网关时 TCP 没设 Unit ID；⑤ 老设备单事务只支持读 1 个寄存器。

2.2 现场总线 Fieldbus：模拟时代的"数字革命"

现场总线是 1980–90 年代兴起的数字通信技术，用于替代传统 4–20 mA 模拟信号和点对点硬接线。共同价值是：一根线上挂多台仪表、双向数字通信、远程诊断。

2.2.1 PROFIBUS（DP/PA）

  • 组织：PI（PROFIBUS & PROFINET International）
  • DP（Decentralized Periphery）：RS-485，最高 12 Mbit/s，主从式周期性，用于控制器 ↔ 分布式 I/O / 驱动器
  • PA（Process Automation）：31.25 kbit/s，本质安全，物理层与 FF H1 相同（MBP），专用于流程仪表
  • 用 GSD 文件描述设备参数；在国内电力、冶金、市政等领域渗透率极高

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DP · 12 Mbit/s · RS-485

DP

PA · 31.25 kbit/s · 本安

PA

主站 控制器

从站 I/O

变频器

耦合器 DP/PA

压力变送器

温度变送器

2.2.2 HART：模拟信号上的"数字叠加"

  • 全称：Highway Addressable Remote Transducer，1986 年 Rosemount 推出
  • 本质：在标准 4–20 mA 模拟信号上叠加 FSK 数字信号（1200 bit/s），模拟量承载主变量，数字量承载参数/诊断
  • 现状：安装基数最大的现场仪表协议，几乎每块智能变送器都支持；HART 7 引入 WirelessHART（IEC 62591）

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4–20 mA 模拟主变量

同一对双绞线

FSK 数字信号 ±0.5 mA · 1200 bps

智能变送器 / 阀门定位器

2.2.3 FOUNDATION Fieldbus（FF）：控制下放到现场

  • FF H1：31.25 kbit/s，本质安全、总线供电，最长 1900 m
  • FF HSE：100 Mbit/s 以太网骨干，连接 H1 网段
  • 最大特点——Control in the Field（控制在现场）：FF 仪表内置标准功能块（AI、PID、AO），控制回路可直接在仪表间闭环执行，不依赖控制器

2.2.4 其他现场总线速查

协议主导特点主要市场
DeviceNet ODVA 基于 CAN，供电+通信 北美离散制造
CANopen CiA 基于 CAN，开放，CiA 301/402 欧洲、移动机器人、运动控制
CC-Link 三菱/CLPA 主从，日本工厂自动化 日本、亚洲
AS-i AS-Interface 极低成本二线制 全球离散
SERCOS I/II 德国驱动联盟 光纤环网，运动控制 欧洲驱动

2.3 工业以太网：把"确定性"做进以太网

21 世纪后，现场总线"速率低、网段分散"的短板日益明显，工业界转向基于标准以太网（IEEE 802.3）的实时通信。核心挑战只有一个：标准以太网的 CSMA/CD 冲突机制无法保证确定性，于是各家在"以太网之上"做了不同改造。

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2001

PROFINET

发布（PNO）

2001

EtherNet/IP

发布（ODVA）

2003

EtherCAT

发布（Beckhoff/ETG）

2003

POWERLINK

开源（B&R）

2006

PROFINET IRT

等时同步实时

2016

OPC UA PubSub 发布

2022

OPC UA FX C2C

标准发布

2023

Ethernet-APL

10BASE-T1L 落地

2025

IEC/IEEE 60802 TSN

工业 profile 发布

工业以太网演进脉络

2.3.1 PROFINET：一个协议、三档性能

PROFINET 完全复用标准以太网硬件，按实时性分三档：

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IRT 等时同步实时（硬实时）

专用时隙 · <1 ms · 抖动 <1 μs · 运动控制

RT 实时（软实时）

周期 I/O · 1~10 ms · 跳过 IP 层 EtherType 0x8892

NRT 非实时（TCP/IP）

组态 · 诊断 · 参数 · 约 100 ms

  • 支持 S2 冗余、MRP 环网、PRP/HSR 网络冗余；
  • 主导市场：欧洲、中国，流程与离散两栖的最强选手之一。

2.3.2 EtherNet/IP：一套 CIP、多种介质

CIP（Common Industrial Protocol） 是 ODVA 维护的、独立于介质的应用层协议，统一贯穿 EtherNet/IP、DeviceNet、ControlNet、CompoNet：

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CIP 通用工业协议（对象模型 · I/O · 显式消息 · 安全 · 运动）

EtherNet/IPTCP 44818 / UDP 2222

DeviceNetCAN

ControlNet同轴/光纤

CompoNet

  • 隐式消息（Implicit / Class 1）：UDP 多播，周期性实时 I/O 数据；
  • 显式消息（Explicit / Class 3）：TCP 请求/应答，组态、诊断、读写；
  • 主导市场：北美、日本，Rockwell 为核心。

2.3.3 EtherCAT：最快的工业以太网

  • 原理：“飞读飞写”（Process on the Fly）——主站发出一帧，从站边转发边就地读写自己的数据位，无需逐站排队：

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主站

单个以太网帧在环上边传边处理

从站1 就地读写

从站2 就地读写

从站3 就地读写

  • 性能：1000 个分布式 I/O 点刷新约 30 μs，支持**分布式时钟（DC）**纳秒级同步；
  • 从站需专用 ESC 芯片；开源主站（Linux IgH）生态成熟；主导全球运动控制领域。

2.3.4 工业以太网横向对比

协议主导组织是否绕过 IP同步能力典型周期实时性
EtherCAT ETG（Beckhoff） 是（ESC 芯片） 分布式时钟 µs 级 ★★★★★
PROFINET IRT PI（Siemens） 是（专用芯片） 等时同步 31.25 µs 起 ★★★★
POWERLINK EPSG（B&R/ABB） 否（主从调度） 较强 百 µs 级 ★★★★
SERCOS III IG Sercos 是 强 µs 级 ★★★★
CC-Link IE CLPA（三菱） 部分 较强 ms 级 ★★★
EtherNet/IP ODVA（Rockwell） 否 一般 ms 级 ★★★
Modbus TCP Modbus-IDA 否 弱 10 ms+ ★

2.4 信息集成层：OPC UA 与 MQTT

现场层解决"怎么把数据传上来"，OPC UA 解决"数据怎么被理解和安全地共享"——这是打通 IT/OT 的关键。

2.4.1 OPC UA 的四大支柱

  • 信息建模：地址空间 + 配套规范（Companion Specs），让"温度值"带语义，而非裸字节；
  • 安全内置：X.509 证书、AES 加密、签名、角色权限；
  • 两种通信模式：Client/Server（请求应答）+ PubSub（发布订阅，支持 UDP/MQTT/AMQP）；
  • 跨平台：从嵌入式到云端统一。

    • 2.4.2 OPC UA FX：向现场层进军

    OPC UA FX（Field eXchange，Parts 80–83） 是 OPC UA 向控制器与现场设备层延伸的关键一步：

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    OPC UA FX 现场级通信

    C2C 控制器↔控制器

    C2D 控制器↔设备

    D2D 设备↔设备

    over TSN 确定性传输

    PubSub UDP 多播

    Client/Server 组态与诊断

    • C2C（控制器对控制器）官方标准 2022 年发布，跨厂商 PLC 直接交换周期数据，取代厂商私有链路。

    2.4.3 MQTT / Sparkplug

    • MQTT：轻量发布订阅，OT 数据上云/上边缘的主流通道；
    • Sparkplug：MQTT 之上的工业主题/负载规范，定义统一数据模型。

    第三部分 · 厂商协议族

    开放标准之上，每家 PLC/DCS 厂商还自建一套垂直整合的协议栈。理解它们，是打通具体品牌生态的第一步。

    3.1 西门子 Siemens：S7 协议族

    西门子的协议生态分两条相对独立的链路：上位机链路（访问 PLC 内部数据）与现场总线链路（连接 PLC 与现场设备）。

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    西门子 S7 通信协议族

    现场总线层

    PROFINET RT / IRT

    PROFIBUS DP

    串口现场层

    PPI

    MPI

    以太网控制层

    S7 Communication

    ISO-on-TCP

    信息管理层

    Fetch/Write

    SIE WebApi

    OPC UA

    网关服务层

    S7 Virtual Server

    S7 PPI Server

    3.1.1 协议栈速查

    协议所在层传输端口主要场景
    PPI 现场 RS-485 187.5k — S7-200 编程口
    MPI 控制 RS-485 12M — S7-300/400 多点总线
    S7 Communication 控制 ISO-on-TCP TCP 102 最常用 S7 通讯
    Fetch/Write 信息 ISO-on-TCP TCP 102 第三方系统集成
    SIE WebApi 信息 HTTP/HTTPS 80/443 S7-1200/1500 REST
    OPC UA 上层 TCP 4840 工业 4.0 主协议
    PROFINET 现场 实时以太网 EtherType 0x8892 ET200SP / SINAMICS
    PROFIBUS DP 现场 RS-485 — 老车间

    3.1.2 S7 Communication 协议栈

    PLC CPU

    S7Comm (application)

    COTP (TPDU)

    TPKT (RFC1006)

    上位机

    PLC CPU

    S7Comm (application)

    COTP (TPDU)

    TPKT (RFC1006)

    上位机

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    TPKT Header (4B)

    1

    CR (Connect Request) → CC

    2

    Setup Communication (0xF0)

    3

    Read/Write Request (header + parameter + data)

    4

    Read/Write Response

    5

    Userdata | Data

    6

    • TPKT 端口 102，COTP 建链（CR/CC）；
    • S7 帧头部固定 10–12 字节，后跟 Parameter 和 Data 区；
    • 常用功能码：0x04 Read、0x05 Write、0x28 PLC Control、0x1A~0x1F 程序上下载；
    • 开源实现：snap7（最稳）、libnodave、OpenS7。

    3.1.3 关键坑点

    • TSAP 配置：S7-300/400 默认 03.02（机架 0 槽 2），S7-1200/1500 默认 03.01（机架 0 槽 1）；
    • PDU 大小协商：S7-300/400 最大 240–480B，S7-1200 4KB，S7-1500（S7-PLUS）64KB；
    • 优化 DB：S7-1200/1500 的 Optimized DB 无法绝对地址访问，需符号寻址或 WebApi。

    3.2 罗克韦尔 Rockwell / Allen-Bradley

    Rockwell 以 CIP（Common Industrial Protocol） 为核心，多种物理层和封装方式为载体，兼容 40 年来的设备谱系。

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    Allen-Bradley 通讯协议族

    现代工业以太网

    EtherNet/IP CIP

    Connected CIP

    微型/边缘控制器

    Micro800

    兼容层/迁移层

    CIP PCCC

    CIP PCCC Server

    传统串行/专有网络

    DH-485

    DF1

    3.2.1 端口与寻址速查

    协议/模式物理层传输层默认端口控制器家族寻址方式
    EtherNet/IP CIP 以太网 TCP 44818 ControlLogix / CompactLogix 标签名（Symbolic）
    EtherNet/IP I/O 以太网 UDP 2222 Logix 系列 Assembly Instance
    PCCC over Ethernet 以太网 TCP 2222 PLC-5E / SLC 5/05 文件/元素（N7:0）
    DF1 RS-232/485 — — PLC-5 / SLC / MicroLogix 文件/元素
    DH-485 / SLC Net RS-485 — — SLC 500 / MicroLogix 文件/元素 + 节点

    3.2.2 三代演进

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text{fill:lightgray;}#mermaid-svg-T6H3uEeWpuCF1hdI .disabled text{fill:#efefef;}#mermaid-svg-T6H3uEeWpuCF1hdI .section-root rect,#mermaid-svg-T6H3uEeWpuCF1hdI .section-root path,#mermaid-svg-T6H3uEeWpuCF1hdI .section-root circle{fill:hsl(240, 100%, 46.2745098039%);}#mermaid-svg-T6H3uEeWpuCF1hdI .section-root text{fill:#ffffff;}#mermaid-svg-T6H3uEeWpuCF1hdI .icon-container{height:100%;display:flex;justify-content:center;align-items:center;}#mermaid-svg-T6H3uEeWpuCF1hdI .edge{fill:none;}#mermaid-svg-T6H3uEeWpuCF1hdI .eventWrapper{filter:brightness(120%);}#mermaid-svg-T6H3uEeWpuCF1hdI :root{–mermaid-font-family:\”trebuchet ms\”,verdana,arial,sans-serif;}

    1980s

    PLC-5 / SLC 500

    时代

    DF1 串口协议 +

    PCCC 命令集

    DH+ / DH-485

    专有总线

    1990s

    SLC 500 扩展

    SLC Net / DH-485

    以太网萌芽 (PLC-5E,

    SLC 5/05)

    2000s

    Logix 平台兴起

    EtherNet/IP

    成为主流

    CIP 统一应用层

    2010s+

    Micro800 系列

    CIP Symbolic

    Addressing

    CIP Security /

    Motion / Safety

    Allen-Bradley 通讯协议演进

    3.2.3 给驱动开发者的提示

  • 先确认控制器家族：老设备 PCCC 文件寻址，Logix/Micro800 CIP 标签寻址，两者不可混用；
  • 端口别搞混：CIP 显式 TCP 44818，PCCC over Ethernet 常见 TCP 2222，I/O 隐式 UDP 2222；
  • Micro800 不是小号 ControlLogix：不支持复杂 backplane 路由，也不支持作为 CIP Scanner 做 Implicit I/O；
  • Logix 机架访问需路由路径：通过 ENBT/EN2T 访问背板 CPU 时须指定 backplane, slot；
  • DF1 没有以太网原生版：遇到"以太网走 DF1"实际是 PCCC 封装或串口服务器透传。

    • 3.3 三菱 Mitsubishi：MC 协议族

    三菱体系的特点是协议不统一——不同 PLC 家族（FX、A、Q/L、iQ-R）有不同的协议，再叠加 TCP/UDP、Binary/ASCII、Client/Server 三对交叉维度。

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    三菱 PLC 通讯协议组

    通用工业

    CIP

    MC_QnA_3E4E

    MC_Binary

    MC_ASCII

    MC_Udp_Binary

    MC_Udp_ASCII

    MC_R

    MC_Virtual_Server

    MC_A_1E

    MC_A1E_Binary

    MC_A1E_ASCII

    MC_A1E_Server

    A_3C

    A3C_串口

    A3C_OverTcp

    A3C_Server

    FX

    FX_Serial

    FX_Serial_OverTcp

    FX_Links

    3.3.1 PLC 型号 → 推荐协议速查

    PLC 型号优先协议备选
    FX0S/FX1S/FX2N FX Serial 或 FX Links —
    FX3G/FX3U FX Serial + MC Binary FX Links
    FX5U MC Binary（SLMP 兼容） EtherNet/IP
    A1S/A2N/A3N MC A-1E Binary A-3C
    Q02/Q03 老 Q MC R MC Binary
    QnA/Q/L 系列 MC Binary MC ASCII
    iQ-R MC Binary EtherNet/IP

    3.3.2 默认端口

    协议默认端口
    MC Binary / ASCII / Udp 5000（UDP 同）
    MC A-1E 5000
    A-3C 5001 或自定义
    EtherNet/IP 44818 / 2222

    选型口诀：真实 Q/L/iQ-R + 不犯错 → MC Binary；跨网段高实时 → UDP 版；老 PLC 只吃 ASCII → ASCII 版；无实物联调 → MC Virtual Server。

    3.4 欧姆龙 Omron：FINS + HostLink

    欧姆龙协议族既有私有的 FINS/HostLink，也有开放的 EtherNet/IP/CIP，在现代以太网机型中两者共存。

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    欧姆龙 PLC 协议封装

    FINS

    9600

    9600

    CIP / EtherNet/IP

    44818

    Connected CIP

    FINS Virtual CIP

    HostLink

    HostLink 串口

    HostLink C-Mode

    HostLink Over TCP

    服务端/仿真

    FINS UDP Server

    CIP Server

    3.4.1 FINS 报文结构

    FINS 报文 = FINS 头（10 字节）+ 命令码（2 字节）+ 参数/数据。核心字段：ICF（控制）、DNA/DA1/DA2（目标网络/节点/单元号）、SNA/SA1/SA2（源）、SID（匹配请求响应）。常用命令码：0101 读存储区、0102 写存储区、0501 读控制器状态。

    3.4.2 选型建议

    场景推荐
    新项目、以太网机型、上位机采集 FINS TCP
    局域网内高频轮询 FINS UDP
    实时控制、伺服联动 Connected CIP / EtherNet/IP
    旧型号、串口机型 HostLink 或 TCP 透传

    注意：FINS 数据为大端，CIP 数据多为小端，解析时注意字节序。

    3.5 倍福 Beckhoff：ADS + EtherCAT

    倍福是"工业 PC 化"最彻底的一家：TwinCAT 软 PLC + ADS 统一接口 + EtherCAT 实时总线，三个层级不分家。

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    物理层（多协议并行）

    TwinCAT Runtime

    ADS 路由层（统一访问层）

    应用层

    AMS NetId 寻址

    实时 EtherCAT 帧

    实时 EtherCAT 帧

    实时 EtherCAT 帧

    工程接口

    ADS / OPC UA / Modbus

    TwinCAT 3 工程

    SCADA / HMI / 自研上位机

    Ads Net 网络侧/客户端

    Ads Server 设备侧/服务端

    PLC 任务

    NC 运动控制

    IO 任务

    EtherCAT 默认现场总线

    TCP/UDP ADS Router

    Modbus TCP/RTU

    OPC UA Server

    EtherNet/IP Adapter

    3.5.1 ADS 关键概念

    概念说明
    AMS NetId 6 字节唯一地址，类 IP 但不依赖 IP（如 192.168.1.10.1.1）
    AMS Port 2 字节（PLC 任务常用 801，IO 100，System 10000）
    ADS Router 路由服务，每个 TwinCAT 节点跑一份
    传输通道 TCP/IP（默认）、UDP、共享内存（同机最优）

    工程经验：上位机读写量过大时用 AddNotification（订阅）而非轮询 Read，否则 CPU 跳涨；Notify 走事件驱动，带宽占用低两个数量级。

    3.6 松下 Panasonic：Mewtocol + MC 3E + RTEX

    松下 PLC 提供两类"语言"：自家的 Mewtocol（ASCII），以及为兼容三菱生态引入的 MC 协议 3E 帧二进制。

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    Panasonic 协议命名空间

    Panasonic Plc

    Pan Mc_3EBinary 三菱 MC 3E 帧

    Pan Mewtocol松下原生 ASCII

    Pan MewtocolOverTcpTCP 透传

    Pan Mewtocol Server

    3.6.1 核心成员

    协议接口端口定位
    Mewtocol RS232C/RS485 — 松下原生 ASCII，调试/legacy
    MewtocolOverTcp Ethernet 2000 串口转网、远程维护
    MC Protocol 3E Binary Ethernet 5001/1025 等 大数据量、三菱兼容
    Modbus TCP/RTU Ethernet/RS485 502 第三方仪表
    RTEX 100 Mbps 环网 — MINAS A6N 多轴高速同步

    3.6.2 Mewtocol 帧结构

    一个完整帧包含 5 部分：%（帧头）+ 站号 + 文本（命令字 + 地址/长度 + 数据）+ BCC（异或校验）+ CR。典型读命令：%01#RCSX0000100\\r。

    BCC 坑：很多人漏算帧头 %，或把终止符 \\r 也纳入校验；正确做法是"从帧头到文本末（不含 BCC 和 CR）"逐字节 XOR。

    3.7 基恩士 Keyence：MC-3E + Nano

    KEYENCE 的协议族围绕"新老 PLC 兼容"展开：

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    Keyence Plc

    PLC 核心协议

    智能外设协议

    MC-3E Binary / ASCII

    Nano ASCII 串口

    Nano OverTCP

    KV300 / Older

    SR-2000 读码器

    DL-EN1 传感器单元

    3.7.1 一句话结论

    • KV-7000/8000 及较新 PLC → MC-3E（Binary），端口 5000；
    • KV-5000/3000/1000/700、Nano 系列 → Nano 上位链路协议，串口或 TCP 8501；
    • 老型号 KV-300 / Visual KV → Host Link / KV 协议（Older），串口 ASCII；
    • 读码器 SR-2000 → MC 协议、EtherNet/IP、PROFINET、无协议等多种方式；
    • 位移传感器 DL-EN1 → TCP Socket 无协议 ASCII，默认端口 64000（不是 8500）。

    3.7.2 关键坑

    • 站号/网络号：KEYENCE MC-3E 默认都是 0，不要照搬三菱多站经验；
    • 二进制开关：MC-3E 推荐二进制，吞吐更高；
    • DL-EN1 端口：默认 64000，8500 是系统保留。

    3.8 汇川 Inovance：国产"自有 + 开放"双轨

    汇川是国产自动化代表，协议生态更扁平——围绕核心设备类型形成协议簇：

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    汇川通信协议族

    PLC 串口链路

    InovanceSerial

    InovanceComputerLink

    PLC 以太网链路

    InovanceTcpNet

    伺服/变频器链路

    EasyNet

    ConnectedClp

    开放标准

    Modbus RTU / TCP

    CANopen

    EtherCAT

    PROFINET

    3.8.1 核心协议定位

    协议应用对象定位
    InovanceSerial H3U/H5U 自有串口协议，类似 PPI
    InovanceComputerLink H3U/H5U 兼容三菱 Computer Link
    InovanceTcpNet H5U/AM400/600/AC800 自有以太网，对标 S7 Communication
    EasyNet SV660/SV680/MD500 伺服/变频器专用
    ConnectedClp SV680/AC800 高端多轴同步（抖动 <1ms）

    3.8.2 设备与协议支持矩阵（节选）

    协议H3UH5UAM600AC800SV660SV680MD500
    InovanceSerial ✅ ✅ ❌ ❌ ❌ ❌ ❌
    InovanceTcpNet ❌ ✅ ✅ ✅ ❌ ❌ ❌
    EasyNet ❌ ❌ ❌ ❌ ✅ ✅ ❌
    Modbus RTU ✅ ✅ ✅ ✅ ✅ ✅ ✅
    Modbus TCP ❌ ✅ ✅ ✅ ❌ ✅ ✅
    EtherCAT ❌ ❌ ❌ ✅ ❌ ✅ ❌
    PROFINET ❌ ❌ ✅ ✅ ❌ ❌ ❌

    3.9 DCS 厂商：骨干网私有协议

    DCS（集散控制系统）区别于 PLC 体系的重要特征，是其骨干网（Backbone）协议——用于控制器、服务器、操作员站之间的高可靠实时互联。

    厂商系统骨干网/专用协议特点
    Honeywell Experion PKS FTE（容错以太网） 物理冗余+逻辑单网，<1s 切换
    Emerson DeltaV / Ovation 冗余控制网 深度集成 HART + FF
    Yokogawa CENTUM VP Vnet/IP 1 Gbps 全冗余
    ABB 800xA PROFINET / EtherNet/IP 早期 MasterBus/AF100 已统一
    Siemens PCS 7 冗余工业以太网 复用 SIMATIC 生态
    和利时 HOLLiAS MACS 自研实时内核 火电国产第一，兼容龙芯/飞腾
    中控技术 ECS-700 标准协议丰富 化工龙头
    国能智深 iDCS 全栈国产 国家能源集团自研

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    上层交换机 A

    上层交换机 B

    下层交换机 A

    下层交换机 B

    控制器 C300

    服务器/操作站

    Honeywell FTE 任意两设备间最多 4 条独立路径，故障检测与路径切换 <1 秒。

    第四部分 · 机器人通信协议

    机器人不是孤立执行器，而是多子系统实时协作的复杂机电系统，没有一种协议能通吃，于是形成"协议组"。

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    机器人通讯协议组

    现场总线

    PROFIBUS-DP

    CANopen

    DeviceNet

    Modbus RTU

    SERCOS

    工业以太网

    PROFINET RT / IRT

    EtherCAT

    EtherNet/IP

    POWERLINK

    厂商私有协议

    FANUC

    KUKA

    ABB

    YASKAWA

    应用与中间件

    OPC UA

    MQTT

    ROS / ROS2

    DDS

    gRPC / REST

    4.1 机器人厂商私有协议

    厂商核心接口实时能力说明
    FANUC FOCAS/Ethernet — 程序/状态访问，PC Developer’s Kit
    KUKA KUKA.Ethernet KRL XML / RSI RSI 周期 4 ms RSI 实时引导（力控/视觉伺服）
    ABB EGM / RTC EGM 250µs–4ms 外部引导运动
    YASKAWA MotoCom32 / HSES — HSES 高速实时数据接口

    集成要点：私有协议实时性越强（ABB EGM、KUKA RSI），门槛与授权费越高；若只需状态监控与程序控制，标准总线（PROFINET/Modbus TCP）往往更经济通用。

    4.2 应用层中间件：ROS / ROS 2 / DDS

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    OPC UA

    MQTT / gRPC

    AGV/AMR

    DDS/RTPS

    CANopen / CAN

    CAN / EtherCAT

    ROS2 计算平台

    底盘控制器 MCU

    激光雷达

    IMU/编码器

    调度系统 WMS / RCS

    MES

    • ROS 1：Master/Node + XML-RPC + TCPROS，单点故障、非实时；
    • ROS 2：去中心化，底层基于 DDS（RTPS），通过 RMW 抽象层可替换 DDS 实现（Fast DDS / Cyclone DDS）；
    • DDS：OMG 标准，发布/订阅 + QoS 策略，高可靠、去中心化。

    第五部分 · 横向对比与选型

    5.1 主流协议横向对比

    协议介质/物理层最高速率实时性层级主导市场
    HART 4–20mA + FSK 1.2 kbps 弱 现场仪表 全球
    FF H1 双绞线（本安） 31.25 kbps 中 现场仪表 欧美流程
    PROFIBUS DP RS-485 12 Mbps 高 控制/现场 欧洲·中国
    Modbus RTU RS-232/485 115.2 kbps 弱 第三方集成 全球
    PROFINET IRT 标准以太网 100M/1G 极高（<1ms） 控制/现场 欧洲·中国
    EtherNet/IP 标准以太网 100M/1G 高 控制/现场 北美·日本
    EtherCAT 以太网帧 100M 极高（~30µs） 运动/现场 全球运动控制
    Modbus TCP 以太网 100M/1G 弱 集成 全球
    OPC UA 平台无关 — 中 L3/L4+ 全球 IT/OT
    Ethernet-APL 单对线（本安） 10 Mbps 高 现场仪表 新兴

    5.2 端口速查表

    协议默认端口
    S7-Protocol（ISO-on-TCP） TCP 102
    Modbus TCP TCP 502
    OPC UA TCP 4840
    EtherNet/IP TCP 44818 / UDP 2222
    PROFINET IO/RT UDP 34964 / 34965
    FINS（Omron） TCP/UDP 9600
    ADS Router（Beckhoff） UDP 48899 / TCP 48898
    MQTT TCP 1883（TLS 8883）
    BACnet/IP UDP 47808
    三菱 MC TCP 5000
    KEYENCE MC-3E TCP 5000
    KEYENCE Nano OverTCP TCP 8501
    松下 MewtocolOverTcp TCP 2000
    KEYENCE DL-EN1 TCP 64000

    5.3 选型决策总图

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    伺服/多轴同步 µs级

    通用 I/O 与设备互联 ms级

    第三方设备快速接入

    IT/OT 集成、上云、跨厂商语义

    危险区仪表总线

    西门子生态

    罗克韦尔生态

    三菱生态

    倍福生态

    否，专用网络

    是

    开始选协议

    要解决什么?

    EtherCAT / PROFINET IRT

    和谁集成?

    Modbus RTU / TCP

    OPC UA + MQTT

    FF H1 / PROFIBUS PA

    PROFINET

    EtherNet/IP

    CC-Link IE / MC

    ADS + EtherCAT

    需要过标准交换机?

    TSN 或软实时方案

    5.4 按场景速查

    场景推荐
    智能仪表组态/诊断（存量最大） HART
    危险区多仪表总线控制 FF H1 / PROFIBUS PA
    控制器 ↔ 远程 I/O 高速周期 PROFINET / EtherNet/IP
    伺服/运动控制子网 EtherCAT / PROFINET IRT
    第三方设备（PLC/仪表/UPS）快速接入 Modbus RTU/TCP
    IT/OT 信息集成、上云 OPC UA（+MQTT）
    新建流程工厂"一网到底" Ethernet-APL + TSN + OPC UA FX
    DCS 骨干网高可靠互联 厂商私有（FTE/Vnet/IP）或冗余工业以太网

    第六部分 · 趋势与总结

    6.1 三大趋势技术

    6.1.1 Ethernet-APL：以太网进防爆区

    • 全称：Ethernet Advanced Physical Layer，基于 IEEE 802.3cg 10BASE-T1L；
    • 关键能力：单对双绞线同时供电+通信，10 Mbit/s 全双工，最长 1000 m，支持本质安全（防爆）；
    • 最大红利：可复用现有 FF / PROFIBUS PA 的 Type A 线缆；
    • 标准：IEC TS 63444，由 FieldComm Group、ODVA、OPC Foundation、PI 四大 SDO 联合推动。

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    Ethernet-APL 现场仪表层

    10BASE-T1L · 10 Mbps · 1000 m

    10BASE-T1L · 10 Mbps · 1000 m

    10BASE-T1L · 10 Mbps · 1000 m

    压力变送器

    流量计

    阀门定位器

    APL 现场交换机 PoDL 供电 + 防爆

    工业以太网交换机 TSN

    DCS 控制器 PROFINET / EtherNet/IP

    6.1.2 TSN：让标准以太网"确定性"

    TSN（Time-Sensitive Networking） 是 IEEE 802.1 系列标准，把时间同步与流量调度做进以太网标准：

    标准作用
    802.1AS-Rev 精确时间同步
    802.1Qbv 时间感知整形（分时隙调度）
    802.1Qbu 帧抢占（关键帧优先）
    802.1CB 帧复制与消除（无缝冗余）

    6.1.3 统一以太网愿景

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    10BASE-T1L

    确定性骨干

    现场仪表 Ethernet-APL

    TSN 交换机

    控制器 · 驱动器 PROFINET/EtherNet/IP/OPC UA FX

    边缘/服务器 OPC UA · MQTT

    云 / MES / ERP

    6.2 三点结论

  • 协议没有"最好"，只有"最合适"：现场层、控制层、信息层对实时性/可靠性/开放性的权重完全不同，一个成熟系统通常是多协议协同，而非单一协议包打天下。

  • 开放标准正在赢：以太网/IP 的规模效应 + OPC UA 的语义能力，正在把厂商私有协议逐步挤压到"骨干网冗余"与"私有接口深度交互"这两小块地盘。但厂商私有协议仍牢牢占据"上位机 ↔ 控制器"的高性能与生态锁定位置。

  • 方向已明确——一网到底：Ethernet-APL 打通防爆现场"最后一公里"，TSN 补上确定性，OPC UA FX 补上跨厂商语义。三者的收敛，正在把工业网络从"多协议孤岛"推向"统一开放网络"。

    • 一句话总结：工业通信史，是一部"从专用走向开放、从分段走向一网到底"的历史——而 OPC UA + TSN + Ethernet-APL 正在书写这部历史的下一章。真正的工程能力，在于根据实时性、生态、成本、可维护性四个维度，把上述协议在一条产线里"各司其职"地编排起来。

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