Acyclic Communication Via Modbus Rtu - Siemens SINAMICS G110M Function Manual

Communication via RS485
5.4 Communication using Modbus RTU
5.4.5

Acyclic communication via Modbus RTU

Acyclic communication or general parameter access is realized using the Modbus register
40601 ... 40722.
Acyclic communication is controlled using 40601. 40602 contains the function code (always
= 47 = 2F hex) and the number of the following user data. User data are contained in
registers 40603 ... 40722.
Overview of acyclic communication
40601
Error codes
1 hex: Invalid Length (invalid length)
2 hex: Invalid State (in the actual inverter state, this action is not permitted)
3 hex: Invalid function code (FC ≠ 2F hex)
4 hex: Response not ready (the response has still not been issued)
5 hex: Internal Error (general system error)
Incorrect access operations to parameters via data set 47 are logged in registers
40603 ... 40722. The error codes are described in the PROFIdrive profile.
136
Value in the register
40602
0 47 ...
1 47 Request
length
[bytes]
2 47 Response
length
[bytes]
2 47 0
40603 ... 40722
... Write values for acyclic access
Request data Activate acyclic access
Response data Response for a successful request
Error code Response for an erronous request
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
Explanation
Fieldbuses