5 Functional Mechanisms of this Application
5.1 Functionality of process data exchange
SINAMICS G120 DP at S7-1200
Entry-ID: 70155469, V1.4, 07/2018
Siemens AG 2018 All rights reserved
5.1 Functionality of process data exchange
Figure 5-2: Functionality of process data exchange
The process data contains values which are regularly exchanged between
SIMATIC controller and SINAMICS converter. These values are at least the control
and status word as well as the setpoint speed and actual value. Selecting the
message frame type specifies the exact length and structure.
The “Siemens Telegram 352, PZD 6/6” message frame type used in the example
exchanges 6 words in both directions.
5.1.1 Accessing process data in the user program of the controller
At the start of the cycle, the operating system of SIMATIC S7-1200 stores the
(user) data received by the SINAMICS converter in the I/O input area of the CPU
and transmits the data stored in the I/O output area to the SINAMICS converter at
the end of the cycle. In the user program, the data can be accessed by copying
from or into the I/O area.
The address areas used are defined in the “Devices & Networks” editor. See steps
Figure 16 and 17 in Table 6-1.
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