Functions
5.11 Operation in fieldbus systems
CU240S and CU240E Control Units, FW 3.2
188 Operating Instructions, 03/2009, A5E02440075B AA
Acyclic communication over PROFInet (basic mode parameter access)
In the case of basic mode parameter access, the requests and responses are transferred
acyclically using the mechanism "Acyclic data exchange" of the communication system.
It supports concurrent access by other PROFInet IO supervisors (e.g. startup tool).
Acyclic PROFInet functions
Suitable channels are provided in the inverters of the SINAMICS G120 series for the
different communication devices/different data transfer types:
● Acyclic data exchange with IO controller uses the functions READ and WRITE (with
0xB02E).
● Acyclic data exchange with the help of a SIEMENS startup tool (IO supervisor, e.g.
STARTER). The startup tool can acyclically access parameters and process data in the
inverter.
● Acyclic data exchange with a SIMATIC HMI (Human Machine Interface) (second IO
supervisor). The SIMATIC HMI can acyclically access parameters in the inverter.
● Instead of a SIEMENS startup tool or a SIMATIC HMI, it is also possible for an external
IO supervisor as defined in the acyclic parameter channel according to the PROFIdrive
profile, Version 4.1 (with 0xB02E), to access the inverter.
5.11.3.6 STEP 7 program examples
STEP 7 program example for cyclic communication
S7 program for controlling the inverter
The S7 program, which supplies data for cyclic communication between the inverter and the
central control, can be used for PROFIBUS and PROFINET.
In the example provided below, communication between the control and inverter is handled
via standard telegram 1. The control specifies control word 1 (STW1) and the speed
setpoint, while the inverter responds with status word 1 (ZSW1) and its actual speed value.
352),%86
352),1(7
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