Hi All,

I am working with a multiparameter water quality sonde that communicates via the MODBUS protocol, with each sensor parameter assigned a different Holding Register address. I am still learning MODBUS and, so far, I have successfully read a single sensor value using MB_COMM_LOAD and MB_MASTER on an S7-1200 PLC.

I need guidance on the best approach to read multiple sensor values:

1. Can I use multipleMB_MASTERblocks to read values for each sensor individually?
2. Or, can I use a singleMB_MASTERblock to read all sensor values at once?

Any advice on the most efficient approach would be greatly appreciated.