ACH550 E-Clipse Bypass User’s Manual 2-181
Embedded fieldbus
The system supports the following Modbus function codes for 4xxxx registers:
Actual values
The contents of the register addresses 40005…40012 are
ACTUAL VALUES and are:
• Specified using bypass parameters 5310…5317.
• Read-only values containing information on the operation of the drive.
• 16-bit words containing a sign bit and a 15-bit integer.
• When negative values, written as the two’s complement of the corresponding
positive value.
• Scaled as described earlier in Actual value scaling.
Exception codes
Exception codes are serial communication responses from the drive. The drive
supports the standard Modbus exception codes defined below.
Function Code Description
03 Read holding 4xxxx registers
06 Preset single 4xxxx register
16 (0x10 Hex) Preset multiple 4xxxx registers
23 (0x17 Hex) Read/write 4xxxx registers
Exception
Code
Name Meaning
01
ILLEGAL FUNCTION Unsupported Command
02 ILLEGAL DATA ADDRESS The data address received in the query is not allowable. It is not
a defined parameter/group.
03
ILLEGAL DATA VALUE A value contained in the query data field is not an allowable
value for the ACH550, because it is one of the following:
• Outside min. or max. limits.
• Parameter is read-only.
• Message is too long.
• Parameter write not allowed when start is active.
• Parameter write not allowed when factory macro is selected.
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