REXROTH Fv Series User Manual

Function 0x08: Loop test. The same message is returned.
To test the communication loop of 2 continuous words 1234H and 5678H
with a frequency converter addressed at 01H, the frame structure is descri‐
bed in tables below.
Message start Transmission time for 3.5 bytes
Slave address 01H
Modbus function code 08H
Higher byte of test word 1 12H
Lower byte of test Word 1 34H
Higher byte of test data Word 2 56H
Lower byte of test Word 2 78H
CRC lower byte 9BH
CRC higher byte 3FH
Message end Transmission time for 3.5 bytes
Tab. 12-8: Function 0x08_master request
Message start Transmission time for 3.5 bytes
Slave address 01H
Modbus function code 08H
Higher byte of test word 1 12H
Lower byte of test word 1 34H
Higher byte of test data word 2 56H
Lower byte of test word 2 78H
CRC lower byte 9BH
CRC higher byte 3FH
Message end Transmission time for 3.5 bytes
Tab. 12-9: Function 0x08_slave response
Bosch Rexroth AG DOK-RCON02-FV*********-IB08-EN-P222/259
Rexroth Frequency Converter Fv
Communication Protocols

REXROTH Fv Series Specifications

General

Brand	REXROTH
Model	Fv Series
Category	DC Drives
Language	English