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Hello everyone! I'm new around, and have been looking for some tips on communications. I need to communicate a Quantum PLC (master) to a GE RX3i. I was thinking on working it out through IOScanning, for it seems the best way to read and write data. On the other hand, I think to download this new config, the PLC must be stopped, so direct messaging seems the alternative. I must say this is my first time actually configuring modbustcp comms, so I want to make sure it works out. The comms are like this: i- Quantum reads a series of variables (holding registers, right?) and uses them for logics and for magelis. ii- Quantum must write very few registers to Fanuc, so if I configure IOScanning with, say, %MW350, will it deposit the data on %R40350? Does this standard addressing mean I actually get the info on %R350? iii- Does direct messaging config require to stop PLC for addition of blocks? This Quantum was programmed on FBD, which I'm really not that familiar with. Please help me, I want to use the most reliable messaging for this are somewhat critical processes.