I have many questions to Ask:

1st Question is

is Canopen Protocol like RS-485 Protocol?

2nd Question is

how can i Read Modbus registers USING Modbus RTU by Canopen Signals

3rd Question

is anyone have Experience With ATV61/ATV71 HMI of Schneider VFD and how i can Communicate using RS-485 Protocol or Canopen Protocol

4th Question

if ATV61/ATV71 HMI of Schneider VFD using Cano Open Protocol as The only Communication Protocol used, How i Can Read Registers it by RS-485? i Must have a Canopen to RS-485 Converter?

Regards

 

CANopen is a protocol used over CAN medium and is not at all compatable with Modbus RTU over RS485.

You will need a Modbus RTU slave -to- CANopen master gateway, such as:
http://www.anybus.com/support/support.asp?PID=447&ProdType=Anybus X-gateway

Patrick L

 

I would also add that given CANBus moves payload of 6 to 8 bytes only (depending on higher-level protocol overhead), and given Modbus/RTU doesn't like time-gaps larger than a few milliseconds between bytes, that you could have some serious timing problems without very speciallized 'converter' hardware.

You are probably talking about a $300 converter (if not $500 to $750).

 

ATV71 has a RJ45 port to communicate with Modbus. The CANopen protocol can be accessed from this Modbus network port via the daisy chain tap or the CANopen adaptor (VW3CANA71).

 

Hi,

I can not answer all questions but one.

CANopen can by no means be compared with RS-485.
While RS-485 is not a 'protocol' but a physical and a bit of a data link layer. CANopen is a higher layer protocol - in words of OSI - an application layer protocol. It is based on CAN as data link layer.

Regards
Heinz-Jürgen Oertel

 

A device that allows a CANopen master to access the Modbus slave devices on some Modbus RTU network may help to convert CANOpen to Modbus RTU which will help you get data from Modbus RTU registers.

http://www.icpdas-usa.com/products.php?PID=3074 You can get the gateway product info here.

Luna Li
AE at ICPDASUSA

 

Yes you are Right, sorry for This misunderstanding. i mean Modbus RTU using RS-485 as a Data-link Layer. Thanks Guys for Helping me. i Found our That The Altivar can is support Canopen and Modbus RTU RS-485 and its helpful for me to communicate with Schenider VSD. Appreciate it and thanks for everybody for helping me again.