Bosch Rexroth EFC 3600 Operating Instructions Manual page 178

Bosch Rexroth AG
Communication Protocols
Lower byte of start address
Higher byte of data
Lower byte of data
CRC lower byte
CRC higher byte
End
Fig.13-12: Function 0x03_Request from RTU master
Start
Slave address
ModBus function code
Bytes of data
Higher byte of data in register 0100H
Lower byte of data in register 0100H
Higher byte of data in register 0101H
Lower byte of data in register 0101H
CRC lower byte
CRC higher byte
End
Fig.13-13: Function 0x03_Response from RTU slave
● Function 0x06: Write one register word
CAUTION
– When data is written into the internal registers, there is a limit on the writing times.
The register address may be damaged once the writing times is beyond the writ‐
ing limit. So please avoid frequency writing!
– For details of user writing permission, please see
Attribute Symbols in Parameter Tables" on page
Example: Write 0000H to communication register address 0005H of the slave fre‐
quency converter with address 01H. The frame structure is described in the tables
below:
Start
Slave address
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DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
00H
00H
02H
C5H
F7H
Transmission time for 3.5 bytes
Transmission time for 3.5 bytes
01H
03H
04H
00H
05H
00H
00H
EAH
32H
Transmission time for 3.5 bytes
Frequent writing may damage the internal regis‐
ters!
chapter 17.2.1 "Description of
195.
Transmission time for 3.5 bytes
01H