Hello Guys,
I have been trying to study a Machine that have Omron 3g3mv VFDs that is controlled by CJ1m CPU and SCU41-V1 communication card.
The program is written using Protocol macro. I have studied protocol macro for past few days and I have some basic knowledge about it.
I have been trying to replace the 3g3mv VFD with Schneider ATV drive and I am trying to change the protocol macro to be compatible with schneider drive.

I have few questions.
1. You can see that the Message for requesting drive status for Omron VFD here.

And this is the communication traffic generated by above messages.


I have tested the Schneider drive with Modbus and to get the drive status following command has to be send.

• 01 03 0C 81 00 01 D7 72 Request Drive status from 3201 Register

From this

• 01 = Drive address,
• 03 = Read Holding Register,
• 0C 81= Starting address of the register
• 00 01 = Number of Registers,
• D7 72 = CRC

If I was to implement this to Protocol Macro It should look like this,

But when I download the macro and put the plc on run the output looks like this.

Do you guys have any idea why this is happening.? Am I missing something here?

 

Here is the PLC program and the Protocol macro file.

 

Here are some images for your reference. I am really STUCK with this problem and I will really appreciate any kind of reply.

 

Here is a link to a Protocol Macro file for Modbus serial. It is tried and tested. https://forums.mrplc.com/index.php?/files/file/259-modbus-protocol-macro/

 

Here is a link to a Protocol Macro file for Modbus serial. It is tried and tested. https://forums.mrplc.com/index.php?/files/file/259-modbus-protocol-macro/

Hello,
Thank you very much for replying. I have been at this problem for past few weeks and yesterday finally managed to install a drive and get it working.