Siemens SINAMICS S120, Function Manual

Page: 867 / 1094

Communication
11.4 Communication via MODBUS TCP
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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Register 40605 contains the attribute that you use to control whether you read out the
parameter value or the parameter attribute. In the number of elements you specify how many
indices are read.
11.4.6.1 Communication details
General parameter access is realized using the Modbus register 40601 … 40722.
Communication via DS47 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.
Communication overview
Value in the register Explanation
40601 40602 40603 … 40722
0 47 … … Write values for acyclic access
1 47 Request
length
[bytes]
Request data Activate acyclic access
2 47 Response
length
[bytes]
Response data Response for a successful request
2 47 0 Error code Response for an erronous request
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.