Configuring Hardware and Communication Connections STEP 7.pdf

Commissioning and Service
Offline and online views
After you open the stored configuration ("Offline view") and then start the "Online
view" under menu command PLC > Operator Control/Monitoring And Diagnosis
Of Nodes, the following relationship is applied:
• The Online view displays all nodes found, irrespective of the number of nodes in
the offline configuration.
• STEP 7 uses the manufacturer ID and the configuration data as base for an
attempt to find a corresponding node in the offline view for each node in the
online view.
If successful, (that is, all nodes are identical), the offline view parameters are
applied to the online view.
This method ensures that changes made and saved during the commissioning
phase are immediately available again when the online is opened.
Operator control and monitoring
In the online view you can read inputs and control outputs. Here, the programming
device (PG) functions as the DP master.
1. Select the required node.
2. Call menu command PLC > Operator Control/Monitoring.
The operator control/monitoring dialog box pops up. The path definition indicates
that online access was performed directly via PROFIBUS services.
The difference of calling this function during the hardware configuration (online via
assigned CPU services) to direct access via PROFIBUS services is that triggering
conditions can not be applied to DP slaves.
The dialog displays all inputs/outputs of a module in one line.
Configuring Hardware and Communication Connections with STEP 7
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