I have got compact logix series PLC 1769-l23e-qb1b. I have also placed 1761 NET-AIC converter to convert RS-232 into RS-485. I want to read data of Trinity Meter which is Modbus -RTU slave Device. Can anyone help me? How to do that? My device is configure as Slave id 2 Baud rate 9600 n,1. I want to use sample prg. But problem is that i can't configure my device. So i'll have to edit AB plc sample prg. Can anyone help me?

 

I'm afraid I don't understand your question. You have the hardware and a sample program. That sounds like a good start. What is it exactly that you need help with?

-James Ingraham
Sage Automation, Inc.

 

I don't think the 1761-NET-AIC will do what you are trying to do.

Instead, I'd recommend you use a DIGI ONE IAP to convert EtherNet/IP to Modbus/RTU(485).

This will help you in 2 ways:

1. This won't consume one of your CompactLogix's serial ports.

2. Your ladder logic in the CompactLogix will use a native EtherNet/IP message instruction. The DIGI ONE IAP will take care of the conversion to Modbus/RTU.

Hope this helps!