Efficient Networks Siemens Sinamics S120 - Manual (Page 393)

Communication PROFIBUS DP/PROFINET IO
10.1 Communications according to PROFIdrive
Drive Functions
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
393
Note
Please refer to the following documentation for a detailed description of acyclic
communication:
Reference: /P5/ PROFIdrive Profile Drive Technology
Addressing:
PROFIBUS DP, the addressing can either take the form of the logical address or the
diagnostics address.
PROFINET IO, addressing is only undertaken using a diagnostics address which is
assigned to a module as of socket 1. Parameters cannot be accessed via socket 0.
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Figure 10-20 Reading and writing data
Characteristics of the parameter channel
● One 16-bit address each for parameter number and subindex.
● Concurrent access by several PROFIBUS masters (master class 2) or PROFINET IO-
Supervisor (e.g. commissioning tool).
● Transfer of different parameters in one access (multiple parameter request).
● Transfer of complete arrays or part of an array possible.
● Only one parameter request is processed at a time (no pipelining).
● A parameter request/response must fit into a data set (max. 240 bytes).
● The task or response header are user data.