IO-Link通信协议规范详解

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"IO-LINK-Interface-Spec_10002_V112_Jul13.pdf 是关于IO-LINK通信协议的标准文档，详细阐述了IO-LINK的物理层、数据链路层和应用层，对于开发IO-LINK主站和从站的工程师来说是关键参考资料。此文档由IO-Link社区编写，并且IO-Link技术正计划作为IEC61131-9国际标准进行标准化。" IO-Link是一种点对点的串行通信协议，它提供了一个简单但功能强大的接口，用于连接工业自动化系统中的智能传感器和执行器。IO-Link接口和系统规范V1.1.2版本，发布于2013年7月，包含了截至ID50的所有变更请求，确保了协议的最新性和兼容性。在物理层，IO-Link使用标准的4线连接，包括电源、数据传输线和地线。它支持短距离通信，一般在10米以内，允许在恶劣的工业环境中稳定工作。物理层定义了信号的电气特性，包括传输速率（通常为38.4kbps）和信号编码。数据链路层处理数据的传输，确保数据的可靠性和错误检测。它采用主站-从站架构，主站负责管理和协调与多个从站之间的通信，而从站则提供设备参数和测量数据。数据包通过主站广播到所有从站，从站根据需要响应，这种方式提高了系统的效率。在应用层，IO-Link定义了设备配置、参数设置和诊断信息交换的通用机制。每个IO-Link设备都有一个设备描述符（IODD），包含了设备的功能、参数和可能的故障信息。这使得系统集成更加灵活，无需特定的固件更新就能适应不同设备。此外，IO-Link还支持在线参数化，允许在运行时更改传感器或执行器的参数，增强了生产过程的灵活性。同时，通过IO-Link，设备的诊断信息可以直接反馈到控制系统，简化了故障排查和维护。文档还强调，任何对文档的评论、建议或请求应通过IO-Link的CR数据库提交，登录名为"IO-Link-V112"，密码为"Report"，确保了社区成员之间的沟通与合作。 IO-LINK-Interface-Spec_10002_V112_Jul13.pdf是理解和实施IO-Link通信协议的重要参考，涵盖了从底层硬件通信到上层应用的全面内容，是工业自动化领域不可或缺的技术指南。

Version 1.1.2 – 16 – IO-Link Interface and System © IO-Link

Table A.13 – ISDU syntax ................................................................................................... 205

Table A.14 – Definition of nibble Length and octet ExtLength .............................................. 206

Table A.15 – Use of Index formats ...................................................................................... 206

Table A.16 – Mapping of EventCodes (type 1) .................................................................... 210

Table A.17 – Values of INSTANCE ..................................................................................... 211

Table A.18 – Values of SOURCE ........................................................................................ 211

Table A.19 – Values of TYPE .............................................................................................. 211

Table A.20 – Values of MODE ............................................................................................ 212

Table B.1 – Direct Parameter page 1 and 2 ........................................................................ 214

Table B.2 – Types of MasterCommands .............................................................................. 215

Table B.3 – Possible values of MasterCycleTime and MinCycleTime .................................. 216

Table B.4 – Values of ISDU ................................................................................................ 216

Table B.5 – Values of SIO................................................................................................... 217

Table B.6 – Permitted combinations of BYTE and Length ................................................... 217

Table B.7 – Implementation rules for parameters and commands ........................................ 219

Table B.8 – Index assignment of data objects (Device parameter) ...................................... 220

Table B.9 – Coding of SystemCommand (ISDU) ................................................................. 221

Table B.10 – Data Storage Index assignments .................................................................... 222

Table B.11 – Structure of Index_List ................................................................................... 223

Table B.12 – Device locking possibilities............................................................................. 224

Table B.13 – Device status parameter ................................................................................ 226

Table B.14 – Detailed Device Status (Index 0x0025) ........................................................... 227

Table B.15 – Time base coding and values of Offset Time .................................................. 228

Table C.1 – ErrorTypes ....................................................................................................... 230

Table C.2 – Derived ErrorTypes .......................................................................................... 233

Table D.1 – EventCodes ..................................................................................................... 235

Table D.2 – Basic SDCI EventCodes .................................................................................. 236

Table E.1 – BooleanT ......................................................................................................... 238

Table E.2 – BooleanT coding .............................................................................................. 238

Table E.3 – UIntegerT ......................................................................................................... 239

Table E.4 – IntegerT ........................................................................................................... 239

Table E.5 – IntegerT coding (8 octets) ................................................................................ 240

Table E.6 – IntegerT coding (4 octets) ................................................................................ 240

Table E.7 – IntegerT coding (2 octets) ................................................................................ 240

Table E.8 – IntegerT coding (1 octet) .................................................................................. 240

Table E.9 – Float32T .......................................................................................................... 241

Table E.10 – Coding of Float32T ........................................................................................ 241

Table E.11 – StringT ........................................................................................................... 242

Table E.12 – OctetStringT................................................................................................... 242

Table E.13 – TimeT ............................................................................................................ 243

Table E.14 – Coding of TimeT ............................................................................................ 244

Table E.15 – TimeSpanT .................................................................................................... 244

Table E.16 – Coding of TimeSpanT .................................................................................... 244

IO-Link Interface and System © IO-Link – 19 – Version 1.1.2

INTERNATIONAL ELECTROTECHNICAL COMMISSION 1

____________ 2

PROGRAMMABLE CONTROLLERS — 4

Part 9: Single-drop digital communication interface 6

for small sensors and actuators (SDCI) 7

FOREWORD 9

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising 10

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote 11

international co-operation on all questions concerning standardization in the electrical and electronic fields. To 12

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, 13

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC 14

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested 15

in the subject dealt with may participate in this preparatory work. International, governmental and non-16

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely 17

with the International Organization for Standardization (ISO) in accordance with conditions determined by 18

agreement between the two organizations. 19

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international 20

consensus of opinion on the relevant subjects since each technical committee has representation from all 21

interested IEC National Committees. 22

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National 23

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC 24

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any 25

misinterpretation by any end user. 26

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications 27

transparently to the maximum extent possible in their national and regional publications. Any divergence 28

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in 29

the latter. 30

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity 31

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any 32

services carried out by independent certification bodies. 33

6) All users should ensure that they have the latest edition of this publication. 34

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and 35

members of its technical committees and IEC National Committees for any personal injury, property damage or 36

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and 37

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC 38

Publications. 39

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is 40

indispensable for the correct application of this publication. 41

International Standard IEC 61131-9 has been prepared by subcommittee 65B: Measurement 42

and control devices, in collaboration with subcommittee 65C: Industrial networks, of IEC 43

technical committee 65: Industrial-process measurement, control and automation. 44

The text of this standard is based on the following documents: 45

CDV Report on voting

65B/815/CDV 65B/833/RVC

Full information on the voting for the approval of this standard can be found in the report on 47

voting indicated in the above table. 48

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 49

A list of all the parts in the IEC 61131 series, published under the general title Programmable 50

controllers, can be found on the IEC website. 51

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