Bosch Rexroth EFC 3600, Operating Instructions Manual, Page: 186 / 238

13.2.5 ModBus Communication Example
One slave address is 01H. The frequency setting of the frequency converter has been
set to "Given via communication" and the RUN command source is set to "Inputting
commands via communication". It is required for the motor connected to the frequency
converter to run with 50Hz (forward rotation). The operation can be achieved with func‐
tion 0x10 (function 16) of the ModBus protocol. The messages of the requests from the
master and responses from the slave are shown in table below:
● Example 1: Start 01# frequency converter for forward rotation at frequency of 50.00
Hz (represented by 5000 internally)
Slave
address
Function
code
Start
address
Number of
address
Bytes
of data
Data
content
CRC
code
Request 0x01 0x10 0x4000 0x0002 0x04
0x0001
0x1388
0xFA9E
Response 0x01 0x10 0x4000 0x0002 N/A N/A 0x0854
● Example 2: Read the output frequency of 01# frequency converter and output veloci‐
ty
Slave
address
Function
code
Start
address
Number of
address
Bytes
of data
Data
content
CRC
code
Request 0x01 0x03 0x0D04 0x0002 N/A N/A 0x6687
Response 0x01 0x03 N/A N/A 0x04
0x00E2
0x0015
0x9BCA
● Example 3: Stop 01# frequency converter according to the stopping mode with the
function code
Slave
address
Function
code
Start
address
Number of
address
Bytes
of data
Data
content
CRC
code
Request 0x01 0x06 0x4000 N/A N/A 0x0008 0xCC9D
Response 0x01 0x06 0x4000 N/A N/A 0x0008 0xCC9D
13.2.6 Special Notes
1. The external computer can not write to function codes [b0.06] "Parameter replica‐
tion", [b0.30] "running monitoring display" and [b0.31] "Stop monitoring display".
2. [b0.00] "User password" and [b0.05] "Parameter initialization" do not support mul‐
tiple write including single write in multiple write; Motor nameplate parameters
and motor physical data should not be modified simultaneously; Multi-function
digital input terminals ([E0.01] ~ [E0.05]) writing operation do not permit repeated
nonzero value.
Bosch Rexroth AG
Communication Protocols
DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
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