National Instruments AutoCode NI MATRIX - Manual (Page 30)

Chapter 2 C Language Reference
© National Instruments Corporation 2-13 AutoCode Reference
Implementing Handwritten UCBs
Arguments are passed for each call to the UCB in the following order:
INFO, T, U, NU, X, XDOT, NX, Y, NY, R_P, and I_P
Pointers to all of the arrays ( U , X , XD , Y , R_P , I_P ) and scalers corresponding
to array sizes ( NU , NX , NY ) are passed to each call to the UCB. The sizes of
R_P and I_P arrays must be entered into the UCB dialog to ensure that
proper storage is allocated by the caller. Also, the initial conditions for
states have to be specified in the dialog. Table 2-5 lists the type and purpose
of UCB arguments used in the fixed calling method.
Table 2-5. UCB Calling Arguments and Data Types for the Fixed Interface
Argument Data Type Description
INFO struct STATUS_RECORD* A pointer to STATUS_RECORD structure
representing operation requests and status.
T RT_DURATION Elapsed time.
U[ ] RT_FLOAT An array (of size NU ) of inputs to the UCB.
NU RT_INTEGER The number of inputs to the UCB.
X[ ] RT_FLOAT An array (of size NX ) of state variables of
the UCB.
XDOT[ ] RT_FLOAT An array (also of size NX ). Includes the next
discrete states of X for the discrete subsystems,
and the derivative of X for the continuous
subsystems.
NX RT_INTEGER The number of states (and next states).
Y[ ] RT_FLOAT An array (of size NY ) of outputs from the UCB.
NY RT_INTEGER The number of outputs from the UCB.
R_P[ ] RT_FLOAT An array of real parameters.
I_P[ ] RT_INTEGER An array of integer parameters.