My first Modbus project... AB Micro850 to 2 Yaskawa A1000s.

[AutomationTechBrian]

I finally get to play around with connecting a PLC to a Drive via Modbus TCP. The frustrating part of the process is finding good tutorials or examples of the coding to make it work. I'm working on it tonight, but if someone knows of a good resource, please let me know. I've done DeviceNet on a SLC, but that's about it.

 

[brendan.buchan]

Some tech notes on the Knowledgebase have examples.

Modbus TCP message between Micro800 Modbus TCP master to MicroLogix1400 Modbus TCP slave
678990 | Date Created: 04/03/2015 | Last Updated: 07/03/2015
Access Level: Everyone

Micro850: Transferring data between two Micro850 using Modbus TCP and Modbus RTU
574730 | Date Created: 12/03/2013 | Last Updated: 10/19/2016
Access Level: Everyone

It is not hard once you get used to the way the CCW software wants you to do things.

Basically you will need to set up some MSG_MODBUS instructions and create some variables using the MODBUS configuration data types where you will configure things like port (serial or Ethernet), command type (holding register, input register), target address, length, etc.

Check out the examples I linked, if you don't have a knowledgebase account you can create one. The access level for these tech notes are set to 'Everyone'.

 

[gclshortt]

https://www.youtube.com/watch?v=E1nsgukeKKA

http://www.simplymodbus.ca/TCP.htm

The above two links provide a good basic understanding of the protocol. It will discuss the information being transmitted and received for this protocol.

Regards,

 

[damica1]

Read this carefully. The (.Pdf) and the pictures will help you get started.