Acyclically Read And Write Parameter Via Fc 16 - Siemens SINAMICS G110M Function Manual

Communication via RS485
5.4 Communication using Modbus RTU
5.4.7

Acyclically read and write parameter via FC 16

Via FC 16, with one request, up to 122 registers can be written to directly one after the other,
while for Write Single Register (FC 06) you must individually write the header data for each
register.
Header
In addition to the slave address, enter the transfer type, the start address and the number of
the following registers in the header.
User data
You control the access in the user data via register 40601.
In register 40602, you define the acyclic access as well as the length of the request data.
Register 40603 contains the request reference - it is defined by the user - and the access
type -reading or writing.
From register 40603 and higher, the request aligns acyclic communication via data set 47
according to PROFIdrive.
Register 40604 contains the number of the drive object (for the CU230P-2 always 1) and the
number of parameters that are read out or written to.
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.
140
PROFIDRIVE profile - Acyclic communication (Page 42).
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
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