国内网站上怎么会没有人研究呢，一晚上的时间就这么浪费了。
首先，确保安装wireshark的dll。
https://www.ethercat.org/en/products/98A8E06BB941491398D4E66B481F3CAF.htm
EtherCAT Parser for Wireshark
The parser for EtherCAT is automatically included in the latest Wireshark version available.
To display detailed frame information added by the ET2000 Multi-Channel Probe from Beckhoff Automation, there is a specific EtherCAT DLL available for Wireshark here.
然后，问题在这里解决的。
https://ask.wireshark.org/questions/2391/cant-capture-ethercat-packet
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Can`t capture EtherCAT packet
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Asked: 16 Feb '11, 20:54
Seen: 4,256 times
Last updated: 13 Sep '13, 01:59
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在解决这个问题后，可以进行wireshark抓包。。
https://wiki.wireshark.org/Protocols/ethercat
EtherCAT
EtherCAT is an open, high performance Ethernet-based fieldbus system. The development goal of EtherCAT was to apply Ethernet to automation applications which require short data update times (also called cycle times) with low communication jitter (for synchronization purposes) and low hardware costs. The EtherCAT protocol is optimised for process data and is transported directly within the standard IEEE 802.3 Ethernet frame using Ethertype 0x88a4. It may consist of several sub-datagrams, each serving a particular memory area of the logical process images that can be up to 4 gigabytes in size. The data sequence is independent of the physical order of the nodes in the network; addressing can be in any order. Broadcast, multicast and communication between slaves are possible. If IP routing is required, the EtherCAT protocol can be inserted into UDP/IP or TCP/IP datagrams. This also enables any control with Ethernet protocol stack to address EtherCAT systems.
History
Protocol dependencies
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Ethernet: EtherCAT can use Ethernet as its transport mechanism. The assigned Ethernet type for EtherCAT traffic is 0x88A4.
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UDP: EtherCAT protocol can be transported in UDP datagrams. The assigned UDP port for EtherCAT is 0x88a4.
Example traffic
Frame 1 (128 bytes on wire, 128 bytes captured)
Ethernet II, Src: MS-NLB-PhysServer-14_a6:c9:01:8e (02:0e:a6:c9:01:8e), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
EtherCAT frame header
.... .000 0111 0000 = Length: 0x0070
.... 0... .... .... = Reserved: Valid (0x0000)
0001 .... .... .... = Type: EtherCAT command (0x0001)
EtherCAT datagram(s): 'LRW': Len: 100, Adp 0x0, Ado 0x1, Wc 2
EtherCAT datagram: Cmd: 'LRW' (12), Len: 100, Addr 0x10000, Cnt 2
Header
Command : Logical memory read write (0x0c)
Index : 0x39
Log Addr : 0x00010000
Length : 100 (0x64) - No Roundtrip - Last Sub Command
.... .000 0110 0100 = Length: 100
..00 0... .... .... = Reserved: Valid (0)
.0.. .... .... .... = Round trip: Frame is not circulating (0)
0... .... .... .... = Last indicator: Last EtherCAT datagram (0)
Interrupt : 0x0000
Data : 000000000000000000000000000000000000000000000000...
Working Cnt: 2
Wireshark
Preference Settings
There are no EtherCAT specific preference settings. Allowing sub dissectors to handle data based on heuristic analysis is always enabled and cannot be turned off.
Sub dissectors
Dissectors that are interested in dissecting the EtherCAT datagram portion of the EtherCAT frame (there may be multiple EtherCAT datagrams in each frame), may do so using heuristic analysis by registering themselves using the function heur_dissector_add("ecat.data", ...).
'
Example capture file
Capture of startup sequence for some Beckhoff devices.
*
Display Filter
A complete list of IP display filter fields can be found in the display filter reference
- Show only the EtherCAT based traffic:
ecat
Filter on a specific address offset (ado): ecat.ado == 0x130
Filter on a specific slave by its position or fixed EtherCAT address (adp): ecat.adp == 0x3e9
Filter on a specific cmd (here APRD): ecat.cmd == 0x1
Filter on a specific field of a sub command : ecat.sub1.idx < 0x80
Show only the EtherCAT mailbox traffic: ecat_mailbox
Capture Filter
External links
More information about EtherCAT can be found on the website of the EtherCAT Technology Group: http://www.ethercat.org/
SOEM (Simple Open EtherCAT Master) can be found at http://openethercatsociety.github.io/
IgH EtherCAT Master for Linux can be found at http://www.etherlab.org/en/ethercat/index.php
Hello i have a similiar problem. I cant capture ethercat messages. I am connecting to a beckhoff i/o module(EK1100) using a cross network cable. I use Twincat program for ethercat master protocol. There is no problem with the operation of the device. On same pc i use wireshark to monitor messages.
The program has two modes: run and config mode. I can capture an ethercat message which shows the switching between modes but when input and output values change i can not get a message. In twincat program i can see what has changed. I did not change anythin in wireshark and i have all the plugins, i use version 1.4.3. I could notunderstand what is going on any help will be helpful.