Automation
  • Introduction
  • Communication
  • py-ads
  • ST cheatsheet
  • PLC ST Basic 2, 3, 4
  • PLC ST Basic 5, 6, 7
  • PLC ST Basic 8
  • MCIO 1-5
  • MCIO 1-5 - example
  • MCIO 6
  • Tunning Exp - Motor
  • Installation
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  • Communication
  • 1. Fieldbus
  • 2. Interface
  • Q&A
  • Useful link

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Communication

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Last updated 5 years ago

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Communication

1. Fieldbus

  1. the name of a family of industrial computer network protocols

  2. real-time distributed control

  3. IEC 61158

Example: (1) Profibus, (2) EtherCAT, (3) Modbus

1.1. EtherCAT

EtherCAT® is an Ethernet-based fieldbus system, invented by Beckhoff Automation.

Standard PC(TwinCAT) <--[TCP/IP]--> EtherCat Master(TwinCAT) <--[EtherCat]--> EtherCat Slave

Standard PC(PyADS) <--[TCP/IP]--> EtherCat Master(TwinCAT) <--[EtherCat]--> EtherCat Slave

1.1.1. TwinCAT

The TwinCAT software is the master application for EtherCAT.

2. Interface

2.1. Automation Device Specification (ADS)

  1. device-independent

  2. fieldbus-independent interface

device <-> ADS <-> Message Router (TCP/IP) <-> ADS <-> device

2.1.1. ADS device identification

AdsPortNr:

ADS devices in a TwinCAT message router are uniquely identified by this.

AdsAmsNetId:

Every PC on the network can be uniquely identified by a TCP/IP address, such as "172.1.2.16". The AdsAmsNetId is an extension of the TCP/IP address and identifies a TwinCAT message router, e.g. "172.1.2.16.1.1".

Q&A

  1. where are EtherCat Master? @PC, or @plc-controller

  2. where is ADS? PC <-> PLC?

Useful link

EasyCat:

http://www.autooo.net/utf8-classid123-id53533.html
http://www.ethercat.org/pdf/cn/EtherCAT_Introduction.pdf
http://www.bausano.net/en/hardware/ethercat-e-arduino/easycat.html
http://jayextmemo.blogspot.de/2014/09/ethercat-raspberry-pi-asda-a2.html