Siemens SINAMICS G220 Operating Instructions Manual page 401

Description of function
If the converter detects a logical error in an access attempt, it responds with the following two
bytes in the protocol data unit:
• Byte 1: Highest bit in function code = 1
• Byte 2: Error code
Table 14-44
Error code
01
02
03
04
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
Overview of the error codes
Name
Invalid function code
Invalid register
Invalid data value
General error
14.5 Modbus TCP communication
Possible error causes
• The controller has sent a function code that is not sup‐
ported by the converter.
• The current UMAC settings do not contain any write or
read permissions.
• The controller is attempting to access an invalid register.
• The range defined by the starting register and the num‐
ber of registers contains one or more invalid registers.
The controller is addressing more than 125 registers.
• Write access to a "Read only" register
• Write access to a reserved register
Functions
399