Hello all.
I am starting my first compact logix project. I have experience with the PLC 5 and mico units up till now. I need to send run and speed commands from ladder logic to three Westinghouse MA-7200 drives. I also need to receive current speed at drive and fault (bit) status via modbus.
I see I can go from RS-232 on the PLC to RS-485 on the drives with a convertor. Some research I have done indicates this may be more complicated than a first time user can handle. I used Red Lion's Data Highway Plus on a similar project using a micro 1100 to Watlow temp controllers. I saw some AB reference to a "MVI69-MCM" for modbus/ RTU. I'm not sure what to do. I need to control cost as possible but have limited time (completion by Monday coming). How should I approach this?
I am starting my first compact logix project. I have experience with the PLC 5 and mico units up till now. I need to send run and speed commands from ladder logic to three Westinghouse MA-7200 drives. I also need to receive current speed at drive and fault (bit) status via modbus.
I see I can go from RS-232 on the PLC to RS-485 on the drives with a convertor. Some research I have done indicates this may be more complicated than a first time user can handle. I used Red Lion's Data Highway Plus on a similar project using a micro 1100 to Watlow temp controllers. I saw some AB reference to a "MVI69-MCM" for modbus/ RTU. I'm not sure what to do. I need to control cost as possible but have limited time (completion by Monday coming). How should I approach this?