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AB ML1400 Modbus TCP/IP Communications
SRHair posted a topic in Allen Bradley / Rockwell AutomationHello, I'm new to setting up my controllers and communication between devices. We wanted to see if using Modbus TCP/IP to communicate to a load bank was the right path for us. I was able to configure my Micrologix 1400 controller Channel 1 for Modbus and set the data files. I set up a read holding register 03 message, two write single register 06 messages and one write multiple registers 16. I was able to read the data from the load bank, but I was unable to send any write commands. I didn't get any errors in the messages. I was able to send write commands through my pc to the load bank and it responded properly. So I was thinking I must of missed something in my set up in the PLC. I'm attaching the PLC Program and the command set from the manufacturer. Any help would be greatly appreciated. BENCH_TEST.RSS ALx Series Input Command.pdf ALx Series PWR Command Page.pdf ALx Series Setpoint Command.pdf