Siemens SINAMICS G220 - Page 397

Description of function
The controller accesses the converter parameters using registers 40601 … 40722:
• Write access with function code FC16
• Read access with function code FC03
Register 40601 controls communication via DS47. 40602 contains the function code and the
number of user data items following. Registers 40603…40722 contain the user data.
Value in the register Explanation
40601 40602 40603… 40722
0 47 … … Write values for acyclic access
1 47 Request length
[byte]
Request data Activate acyclic access
2 47 Response length
[byte]
Response data Response for a successful re‐
quest
2 47 0 Error code
1)
1 hex:Invalid length
2 hex:Action not permitted in
current converter state
3 hex: Invalid function code (FC ≠
2F hex)
4 hex: Response has still not been
issued
5 hex:General system fault
Response to an erroneous re‐
quest
1)
The error code is described in the PROFIdrive pro󹪝le.
The structure of the protocol data unit (PDU) in the case of write or read access is as follows:
• Byte7: Write FCode 16; read FCode 03
• Byte8 and Byte9: Register 40601
• Byte10 and Byte11: Number of registers the controller is reading or writing
• Byte 12: Number of bytes the controller is reading or writing
• Byte 13 and following bytes: Data in accordance with DS47 of the PROFIdrive pro󹪝le
Example
The following example describes reading parameter r0002.
Procedure for reading the parameter value of r0002:
1. The controller sends a "Read parameter value" parameter request to the converter.
2. The controller sends a read request to the converter.
3. The converter responds to the read request with the parameter response.
Functions
14.5Modbus TCP communication
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 395