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ACS 400 User’s Manual
Exception Codes
The ACS 400 supports the standard Modbus exception codes. These are shown in Table 20.
Table 20 Exception codes.
Function Codes
The ACS 400 supports the Modbus function codes given in Table 21. If any other function codes
are used, the ACS 400 returns an exception response with error code 01 (illegal function).
Table 21 Function codes.
Code
Name
Meaning
01
ILLEGAL
FUNCTION
The function code received in the query is not an allowable
action for the slave.
ACS 400: Unsupported Command
02
ILLEGAL DATA
ADDRESS
The data address received in the query is not an allowable
address for the slave.
ACS 400: Address outside groups
03
ILLEGAL DATA
VALUE
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
Code
Description
03
Read holding registers
06
Preset single register
16 (10 Hex)
Preset multiple registers
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