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Bosch Rexroth EFC 3600 Operating Instructions Manual page 176

Frequency converter
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Bosch Rexroth AG
Communication Protocols
13.2.3
ModBus Function Codes and Message Format
Supported Functions
The main function of ModBus is to read and to write parameters. Different function co‐
des decide different operation requests. MouBus functions managed by EFC 3600 and
their limits are shown in the table below:
Code
3=0x03
6=0x06
8=0x08
16=0x10
23=0x17
Fig.13-3: EFC 3600 ModBus functions and limits
"Read" and "Write" are considered from the prospect of the master station.
Modbus message formats are different according to the function codes shown below.
Slave No.
0x03
Fig.13-4: Function 3_Request from the master
Number of bytes
Slave
0x03
Depends on
No.
master request
Fig.13-5: Function 3_Response from the slave
Slave No.
0x06
Fig.13-6: Function 6_Master request and Slave response (in same format)
Slave No.
0x08
Fig.13-7: Function 8_Master request and Slave response (in same format)
174/235
Function name
Read N register words
Write one register word
Diagnosis
Write N register words
Read/write N register words
Address of 1
st
Hi | Lo
1
st
word value
Hi | Lo
Address of word
Hi | Lo
Test word 1
Hi | Lo
DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
Broadcast
NO
YES
NO
YES
NO
Number of words
word
Hi | Lo
Last word value
–
Value of word
Hi | Lo
Test word 2
Hi | Lo
Max. value of N
16
–
–
16
16
CRC16
Lo | Hi
CRC16
Hi | Lo
Lo | Hi
CRC16
Lo | Hi
CRC16
Lo | Hi
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