Recursive VIs

Recursive VIs can call themselves from their own block diagram or from the block diagrams of subVIs. Recursive VIs are useful if you want to operate multiple times on the output of the same process. You can make any VI recursive, and you can use multiple recursive VIs in one VI hierarchy.

To use recursive VIs throughout a VI hierarchy, configure all VIs in the hierarchy in one of the following ways.

• Configure all VIs in the VI hierarchy to be reentrant and at least one VI to share clones of itself between instances of calls.
• Configure all VIs in the VI hierarchy to be dynamic dispatch member VIs.
• Configure at least one VI in the VI hierarchy to be a dynamic dispatch member VI or to be reentrant and share clones of itself between instances of calls. Configure the remaining VIs to be reentrant but with pre-allocated clones for each instance of a call.

(32-bit) LabVIEW allows up to 15,000 recursive calls on 32-bit platforms. (64-bit) LabVIEW allows up to 35,000 recursive calls on 64-bit platforms.

(Real-Time Module) The LabVIEW Real-Time Module supports recursion. However, recursion is not real-time deterministic and you cannot debug recursive VIs in LabVIEW Real-Time.

(FPGA Module) The LabVIEW FPGA Module currently does not support recursion.