13
ENGLISH
Commissioning
6.3
No Response Conditions
The drive will not respond to any message that…
• contains one or more parity errors
• has an invalid CRC value
• was not directed to the drive’s network address.
This drive does not support the broadcast function of the Modbus protocol.
• is not at least 8 bytes long (minimum required for the supported functions)
• is more than 18 bytes long (maximum allowed before input buffer overflow occurs)
6.4
Exception Responses
If a valid message is received (i.e. parity, crc, address and message length all pass
validity checks), but the message contents are somehow invalid, the drive will respond
with a Modbus exception.
6.4.1
Message structure for an exception response to a read request (03)
W
SA
83
EC
CRCH
CRCL
6.4.2
Message structure for an exception response to a write request (06)
W
SA
86
EC
CRCH
CRCL
6.4.3
Exception Codes (EC):
EC
Description
01
Command rejected; Illegal function
02
Invalid register number
03
Data value is out-of-range
04
Wrong data format
06
Slave device (drive) busy
