I am using GE90-70 PLC redundancy system to control modbus device, my RTU module is PCM711, how should I set up these system?

 

Is the modbus device you are trying to communicate a modbus slave device or a modbus master device?

 

It is modbus slave device

 

dongml wrote:
> It is modbus slave device <

I have not done it on a redundancy system but I think it would not matter as long as you have PCM card in your hardware configuration. Go to http://www.gefanuc.com/support/plc/f-s9070.htm and download rtu_mstr.exe. That is a modbus master megabasic source. You will have to change the starting address of your com command in the code. Upload it to PCM card using PCOP tool. (If you don't have PCOP please e-mail me [email protected] and let me know) Then fill up the com registers in 90-70 (like master command,slave starting address, length, master starting address etc.) That should work. One thing to note you may have to change the code for replacing the high bytes with low bytes depending on the type of the slave device you are communicating. Hope it works out well.