ABB ACH550 Bedienungsanleitung PDF herunterladen (Seite 26)

Modbus Protocol Technical Data

Actual Values

The contents of the register addresses 40005…40012 are

ACTUAL VALUES and are:

• Specified using 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 ACH550

supports the standard Modbus exception codes defined below.

Exception

Code

Name Meaning

ILLEGAL FUNCTION Unsupported Command

ILLEGAL DATA ADDRESS The data address received in the query is not allowable. It is not

a defined parameter/group.

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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ABB ACH550 Bedienungsanleitung Seite 26