Modbus register format – Rockwell Automation 1420 PowerMonitor 500 User Manual
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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 Significant Bit)
(Least Significant Bit) LSb
High Byte (MSB)
Low Byte (LSB)
Holding Register (word)
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