12.2.4 Communication Mapping Register Address Distribution
Introduction
The communication mapping registers of Modbus are in four types, frequency
converter parameter registers, communication control registers, communica‐
tion state feedback register and communication monitor registers.
Frequency converter parameter registers
Frequency converter parameter registers correspond to the function codes
one-to-one. Reading and writing of related function codes can be achieved
through reading and writing of the contents in frequency converter parameter
registers via Modbus communication. The characteristics and scope of read‐
ing and writing function codes are in compliance with the frequency converter
function code description. The address of a frequency converter parameter
register consists of one word. The higher byte 0x00...0x0C represents the
function code group, and the relationship is shown in table below; the lower
byte represents the function code within the code group.
Function group Mapping address Function group Mapping address
b0 0x00 b1 0x01
S0 0x02 S1 0x03
S2 0x04 S3 0x05
E0 0x06 E1 0x07
E2 0x08 E3 0x09
E4 0x0A E5 0x0B
H0 0x0C
Tab. 12-14: Relationship between frequency converter parameter register ad‐
dresses and corresponding function codes
Example: Parameter register 0x0103, the higher byte 0x01 represents group
b1, the lower byte 0x03 represents the 4
th
function code.
DOK-RCON02-FV*********-IB08-EN-P Bosch Rexroth AG 225/259
Rexroth Frequency Converter Fv
Communication Protocols
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