REXROTH Fv Series, Instruction Manual

Page: 188 / 222

12.2.4 Communication Mapping Register Address Distribution
The communication mapping registers of ModBus are in four types, converter
parameter registers, communication control registers, communication state
feedback register and communication monitor registers.
●
Converter parameter registers
Converter parameter registers correspond to the function codes one-to-one.
Reading and writing of related function codes can be achieved through read‐
ing and writing of the contents in converter parameter registers via ModBus
communication. The characteristics and scope of reading and writing function
codes are in compliance with the converter function code description. The ad‐
dress of a converter parameter register consists of one word. The higher byte
0x00 - 0x0B represents the function code group, and the relationship is
shown in fig. 12-15 "Relationship between converter parameter resigster ad‐
dresses and corresponding function codes" on page 186 ; the lower byte rep‐
resents 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 H0 0x0B
Fig.12-15: Relationship between converter parameter resigster addresses and
corresponding function codes
Example: Parameter register 0x0103, the higher byte 0x01 represents group
b1, the lower byte 0x03 represents the 3 rd function code.
● Communication control registers (0x4000, 0x4001)
The address of command word register for communication control is 0x4000.
This register is write-only. The converter is controlled through writing data in‐
to the address. The definition of each bit is shown in fig. 12-16 "Communica‐
tion control registers（0x4000、0x4001）_bit definition" on page 186 :
bit Value Description
15-8 ‑ Reserved
7
1 Inactive
0 Active
6
1 Stop acceleration/deceleration active
0 Inactive
5
1 Reset active
0 Inactive
4
1 E-Stop active
0 Inactive
3
1 Stop according to parameter setting
0 Inactive
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Rexroth Frequency Converter Fv
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Communication Protocols