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6.3.5.7
Acyclic communication via Modbus RTU
Acyclic communication or general parameter access is realized using the Modbus registers
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 current converter 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.
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
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
Advanced commissioning
6.3 Drive control
Explanation
253
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