Modbus AB Micro850 with Schneider Altivar Drive

[willings]

Hi all, I am trying to control and/or read values from Schneider Altivar12 VFDs. Via Modbus on a AB Micro850 PLC (using the Connected Components Workbench Software). There seems to be two ways to do this with the Micro850, either with messaging (using the msg_modbus instruction function block) or with the Modbus mapping feature. I have a list of the communication parameters (see attached fileView attachment ATV12_Communication_parameters_BBV51917_1.4IE05b.xls) But I haven't had any experience with Modbus and I am not having any success. There is not very much documentation about how to do this, If anyone can help me who has done this or knows how to do it I would appreciate it.

 

[gclshortt]

http://www2.schneider-electric.com/resources/sites/SCHNEIDER_ELECTRIC/content/live/FAQS/12000/FA12122/en_US/Altivar%2021%20Modbus%20manual.pdf
Here is the manual for Modbus RTU fort the Altivar12 VFD.

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/2080-um002_-en-e.pdf
Here is the manual for the Micro850.

You will be using the Micro850 (Master) to the Altivar12 VFD (Slave)
Take a look at Example 2, Micro800 (Master) to PowerFlex 4M Drive (Slave) in the above manual.

Here is a great overview of Modbus RTU.
https://www.youtube.com/watch?v=OvRD2UvrHjE
https://www.youtube.com/watch?v=8FYFai21JPA

This should help you out.
Regards,