2.2 Description of the core functionality
SINAMICS G120 DP at S7-1200
Entry-ID: 70155469, V1.4, 07/2018
Copyright Siemens AG 2018 All rights reserved
2.2 Description of the core functionality
2.2.1 Configuring the communication
The SIMATIC controller as well as the SINAMICS converter is configured in TIA
Portal V13. Hence, they only require one software.
Entering communication parameters twice, as performed so far when using the
STARTER commissioning software, is no longer necessary. Also, a GSDML file
of the used SINAMICS drive does no longer need to be integrated into the
hardware catalog.
The IP and PROFIBUS addresses as well as the I/O address areas for the data to
be exchanged between SIMATIC controller and SINAMICS drive are automatically
created in the TIA Portal for the hardware configuration. However, they can be
modified at any time.
At the SINAMICS drive, the PROFIBUS address is predefined either using DIP
switches or, if all DIP switches are set to ON or OFF, via parameter 918. All
remaining PROFIBUS parameters (e.g. baud rate) are automatically detected or
transferred when starting up the PROFIBUS master, and therefore they need not
be parameterized.
The process data to be exchanged by SIMATIC controller and SINAMICS drive is
specified by the message frame type to be used (in this example: “SIEMENS
Telegram 352”) which you also configure in the hardware configuration under the
Properties of the SINAMICS drive
2.2.2 Data exchange
Data exchange between SINAMICS G120 and SIMATIC S7-1200 occurs in two
areas:
Process data,
i.e. control word(s) and setpoint(s), or status word(s) and real value(s)
Parameter area,
i.e. reading/writing of parameter values
Cyclic process data exchange
Process data is transferred cyclically, which means in each bus cycle. The data is
transferred as quickly as possible.
The SIMATIC S7-1200 sends at least the control word and the setpoint value to
SINAMICS G120 and in return receives at least the status word and the actual
value.
Depending on the message frame type, two further setpoint or real values, or
extended control or status words respectively, can be transferred. The available
message frame types are available in chapter 7.4.1 of the SINAMICS G120C
operating instructions (/6/), for example.
On the controller side, the process data is supplied as I/O input or output
words. The data transfer is supported by STEP 7 instructions (DPRD_DAT,
DPWR_DAT).
In the SINAMICS drive, the configuration specifies which bits of the control
word are used and which data is transmitted to the SIMATIC controller.
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