Rockwell Automation 2071-Axx Kinetix 3 Component Servo Drive Serial Host Command Reference Manual - Manual (Page 11)

Rockwell Automation Publication 2071-RM001B-EN-P - April 2013 11
Chapter
1
Modbus Protocol
This chapter defines the Modbus protocol as it applies to a Kinetix 3 drive.
Function Codes The register number of Modbus devices may begin with 0 or 1, because this is
determined by the Modbus host you have selected. If your controller requires it, a
'1' must be added to the register number.
The maximum number of parameters that can be read or written at the same time
is the same as the number of Modbus addresses, which is the same as the number
of the parameters in each group. In other words, all the parameters in each group
can be read together or written together.
Function Code Description
03 (0x03) Read Holding Registers
04 (0x04) Read Input Registers
06 (0x06) Write Single Register
16 (0x10) Write Multiple Register