Exception Codes; Function Codes - ABB ACS 400 User Manual

Exception Codes

The ACS 400 supports the standard Modbus exception codes. These are shown in Table 25.
Table 25 Exception codes.
Code Name
01 ILLEGAL
FUNCTION
02 ILLEGAL DATA
ADDRESS
03 ILLEGAL DATA
VALUE

Function Codes

The ACS 400 supports the Modbus function codes given in Table 26. If any other function codes
are used ACS 400 returns an exception response with error code 01 (illegal function).
Table 26 Function codes.
Code
03
06
16 (10 Hex)
126
Meaning
The function code received in the query is not an allowable
action for the slave.
ACS 400: Unsupported Command
The data address received in the query is not an allowable
address for the slave.
ACS 400: Address outside groups
A value contained in the query data field is not an
allowable value for the slave.
ACS 400: Value outside min.-tax limits
ACS 400: Parameter is read-only
ACS 400: Message is too long
ACS 400: Parameter write not allowed when start is active
ACS 400: Parameter write not allowed when factory macro
is selected
Description
Read holding registers
Preset single register
Preset multiple registers
ACS 400 User's Manual