Siemens SINUMERIK 840D sl Function Manual page 219

http://support.automation.siemens.com/WW/view/en/23641045/133300
Note
In order to couple the NCUs with one another, both NCUs must be configured in a Step7 project.
Step 1: Set the interface type
The properties of the interface are accessed by double clicking on interface X136. The interface
type must be set to "PROFIBUS" under the "General" tab.
A window then opens with the PROFIBUS configuration. PROFIBUS must be configured in
this window in the usual way.
Step 2: Set the operating mode:
Under the "Mode" tab, an NCU must be set as "DP slave", the other NCU as "DP master".
The configurations can then be saved in both NCUs.
Step 3: Establish the coupling
In order that communication can be established between both NCUs, a coupling must be
established between both of them. To do this, the already configured station must be selected
from the hardware catalog in the "PROFIBUS-DP" area – for SINUMERIK, this is "CPU31..."
– and this must then be dragged to the PROFIBUS line of the PROFIBUS master NCU. The
"Properties - DP slave" window is opened.
Under the "Coupling" tab, the configured PROFIBUS master NCU must be selected and this
connected by selecting "Couple". The window must then be exited with "OK" and the project
saved.
Step 4: Set the logical basis addresses
The addresses for the F_DP communication can now be set under "Properties - DP slave".
Double click on the PROFIBUS slave NCU to open the properties window in which the tab "F-
Configuration" must be selected.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
8.4 Safety-related CPU-CPU communication (F_DP communication)
Connecting sensors and actuators
219