Lenze DDS v2.3 - Manual (Page 115)

Drive PLC Developer Studio
Working with projects and objects
6-37
l
DDS EN 2.3
Monitoring displays the overall value of the expression, not the values of the individual variables.
Example:
a AND b will only then be displayed as TRUE if both variables are TRUE.
In FBD, only the first variable of an expression, that may be used as input of a function block, for
example, becomes visible (monitor). Write values is possible for this variable only.
Write values writes changed values to the control once-only where they can be overwritten again
immediately.
6.3.1.15 Call hierarchy
Icon: - Menu: OnlineWShow Call Stack Keyboard: -
If simulation stops at a breakpoint, use this command to open a dialog box that lists the organization
units currently in the call stack.
•
The first organization unit is always PLC_PRG as this is where processing starts.
•
The last organization unit is always the organization unit that is currently being processed.
Select an organization unit and click Go to to load the selected organization unit into a window and
to display the line or network that is currently processed.
6.3.1.16 Simulation
Icon: - Menu: OnlineWSimulation Keyboard: -
Selection of Simulation puts a tick
ü in front of the menu item.
In simulation mode, the user program will run under Windows on the same PC. Simulation tests the
project. Communication between PC and simulation uses the Windows Message Mechanism.
If the program is not in simulation mode, it will run on the control. Communication between PC and
control uses a gateway. The status of this flag is stored with the project.
Restrictions for simulation
If all tasks are to be considered during simulation, adapt the interval times accordingly.
The following projects are restricted during simulation or cannot be simulated.
•
Lenze function blocks
•
System organization units
6.3.1.17 Communication parameters
Icon: - Menu: OnlineWCommunication parameters Keyboard: -
Use this command to create and manage communication channels to the automation system.
Note!
Use of the OPC or DDE server requires the same communication parameters to be set in that server’s
configuration.
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