Owner manual
Rockwell Automation Publication 1420-UM001D-EN-P - September 2013 43
Communication Chapter 4
Modbus Register Format
Modbus registers are 16-bit words organized as shown in the following diagram.
32-bit and 64-bit data types presented as arrays of single registers in LSW (least
significant word) to MSW (most significant word) order.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
MSb (Most Signicant Bit) (Least Signicant Bit) LSb
High Byte (MSB) Low Byte (LSB)
Holding Register (word)