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The LabVIEW 2011 Platform Known Issues contains a full listing of known issues, including LabVIEW toolkits and modules.
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The following items are known issues in LabVIEW 2011 Control Design and Simulation Module sorted by Date.
| ID | Known Issue | |||||
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| 145976 Return | Editing a Subsystem VI may not add asterisk (*) to title bar of caller VIs When making edits to a Subsystem VI, which will require recompiling the Subsystem's caller, an asterisk may not appear on the caller VI, indicating that it has changed. However, before closing the caller VI, LabVIEW will still prompt you to save the modified VI and there is no danger of unintentionally losing changes. Workaround: N/A
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| 156847 Return | Show Buffer Allocations does not work on simulation diagrams Buffer allocation for arrays and clusters do not show up on a simulation loop or subsystem when using the show buffer allocations tool. Workaround: N/A
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| 159426 Return | Strange mouse pointer behavior using Control Design and Simulation on Mac and Linux The first time you select an item from the Simulation Palette after each LabVIEW launch, it may fail to initialize and drop. Each time you select an item from the Simulation Palette the cursor may display a busy icon until the node is placed on the diagram. Workaround: If item does not appear on the cursor, select it again from the palette. If the busy icon appears for an inordinate amount of time, try to place the node on the diagram.
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| 172558 Return | External model library interface does not automatically download to target. External model library interface does not automatically download to target. Workaround: Place a Call Library Function node that points to the library and hide it behind a case structure that always executes the empty case. This causes RT to download the shared library to the target and load it when the VI runs, or ftp the file to the target.
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| 89687 3SBBPSE9 Return | Cannot make root locus plots part of subplots You cannot make root locus plots part of subplots. Workaround: N/A
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| 155420 Return | A Function Block Appears Twice in a Project When Dropped Inside Simulation Node When you drop a Function Block inside a Simulation Loop, the block and its parameters will be populated in the project twice. Workaround: Place the Function block inside a subVI. This will prevent the second instance of the function block inside the project.
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| 201449 Return | A Feedback Node on a Simulation Diagram causes the VI to fail to compile The Feedback Node does not make sense semantically within a Simulation Diagram, due to the fact that most ODE Solvers will execute the diagram multiple times per iteration and may need to reject steps and try again, filling the Feedback Node with bad data. Workaround: Use the Memory block from the Simulation Utility palette. If a delay of greater than 1 is desired you can chain multiple memory blocks in sequence.
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| 224620 Return | Triggered Subsystems may not perform as expected in certain situations There are two situations where a triggered subsystem may not perform as expected. First, if a node that uses the discrete step size as part of its calculations (such as the discrete integrator) is inside a triggered subsystem, the node will use the global discrete step size rather than the interval between triggers as the discrete step size for its calculations. For example, consider a discrete integrator in a simulation with a discrete step size of .1 inside a triggered subsystem. If the integrator has a constant value of 1 as its input, and it is triggered at t=2 and t=5, its output value after t=5 would be .1, not 2. Second, if a trigger occurs on a time step that is not also a discrete time step (i.e., the trigger occurs at t=1.5, and the discrete step size is set to 1), the triggered subsystem will execute, but none of the discrete nodes inside it will execute. Workaround: N/A
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| 229977 Return | VI with Simulation opens with broken run arrow but no errors Sometimes a VI that uses Simulation from an earlier version of LabVIEW will be broken after opening. This could be a Subsystem VI or a VI with a Simulation Loop. Clicking the run arrow will open the Error List window, showing the broken VI, but no errors will be listed. Workaround: Select any single node on the Simulation Diagram and choose Edit->Clean Up Diagram (Ctrl-U) Having selected a single node will mean that nothing gets moved by the Clean Up Diagram command, but the VI will become runnable.
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| 242420 Return | Direct Transfer Function, State Space, ZPK, and Discrete Filter VIs incorrectly output zero The Transfer Function, State Space, Zero-pole-gain, or Discrete Filter VIs will output only zero if the VI mode changes from indirect to direct through the parameter configuration page. Workaround: Force a mode change through means other than the configuration page. For the discrete blocks, drag the block outside the simulation loop and then move it back.
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| 172863 Return | Simulation Parameters of a subsystem do not update in the parameter tree In the configuration dialog of a Subsystem placed outside of a simulation loop, Simulation Parameters do not update their values as you edit them. However they will be updated the next time the dialog is opened. Workaround: N/A
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| 192062 Return | Cannot change dll that External Model function points to After an iniital dll has been selected for an External Model function, it cannot be changed. A user can select a different dll in the dialog but the change does not get saved. Workaround: N/A
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| 194660 Return | Cannot set up a Single-Input Multiple-Ouputt system When trying to setup a Single-Input Multiple-Output system transfer function, the output reverts to a scalar (single output) when it should be an array (multiple output) Workaround: N/A
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| 258077 Return | LabVIEW crashes when compiling after wiring from a sink outside to a source inside a Simulation Node When you try to wire a node from the outside of the simulation loop to a terminal inside Simulation, and make the tunnel "Use Default if Unwired", then the VI will fail to compile. Workaround: There are two ways to work around this: 1) Start wiring operations across the Simulation Node boundary from the terminal inside the node. 2) Edit the simulation diagram and cause the VI to recompile.
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| 305566 Return | Undoing an action in a subsystem results in broken a VI with the error "failed to compile" Undoing edits to a subsystem so that it is in the state it was in at the last compiled causes the VI to be broken and report "failed to compile". Workaround: Make an edit and it will force the VI to recompile
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Document last updated on 7/30/2011