I'm having trouble finding how to set up Modbus TCP/IP from a generic HMI to an AC500 PLC. How are variables created in the AC500 read/write from Modbus. It appears there are data blocks that will need to be set up. How are they addressed? I will be using all datatypes in my application with many REAL's. Also, the Modbus values will need to remain if the system is turned off. Any help will be appreciated!
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