Connection to a fieldbus
6.3 Communication via PROFIBUS
Inverter with CU240B-2 and CU240E-2 Control Units
110
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
Rules for the slot sequence
Maintain the following sequence when assigning the slots:
1.
PROFIsafe module (if one is used)
2.
PKW channel (if one is used)
3.
Standard, SIEMENS or free telegram (if one is used)
4.
Slave-to-slave module
If you do not use one or several of the modules 1, 2 or 3, configure the remaining modules
starting with the 1st slot.
Note regarding the universal module
It is not permissible to configure the universal module with the following properties:
● PZD length 4/4 words
● Consistent over the complete length
With these properties, the universal module has the same DP identifier (4AX) as the "PKW
channel 4 words" and is therefore identified as such by the higher-level control. As a
consequence, the control does not establish cyclic communication with the inverter.
Remedy: Change the length to 8/8 bytes in the properties of the DP slave. As an alternative,
you can also change the consistency to "unit".
Final steps
● Save and compile the project in STEP 7.
● Establish an online connection between your PC and the S7 CPU and download the
project data to the S7 CPU.
● In the inverter, select the telegram type, which you configured in STEP 7, using
parameter P0922.
The inverter is now connected to the S7 CPU. This therefore defines the communication
interface between the CPU and the inverter. An example of how you can supply this
interface with data can be found in the section STEP 7 program examples (Page 124).