National Instruments 370753C-01 Manual De Usuario

© National Instruments Corporation

Large system models are frequently built by connecting smaller models 
together. You can perform different types of linear system interconnections 
using the Xmath functions discussed in this chapter.

MathScript allows operators (

*

,

+

, and so on) to be overloaded—given 

different behaviors when used with different objects. A number of simple 
types of connections have been implemented as overloaded operators on 
systems, while more complex connections are available through 
specialized functions.

Overloaded operators provide a quick way to perform different types of 
basic connections between systems. Table 3-1 illustrates these operations 
on a pair of systems 

Sys

1

 and 

Sys

2

 with outputs 

y

1

 and 

y

2

 and inputs 

u

1

 

and 

u

2

, respectively.

 

Table 3-1.  Summary of Interconnection Operators

Sys = Sys1 + Sys2

Parallel connection where 

y = y

1

 + y

2

. The inputs are 

tied together where 

u = u

1

= u

2

.

Sys = Sys1 – Sys2

Parallel connection where

  y   =   y

1

 + y

2

.

 

In the unary 

case

,

 

Sys = –Sys

1

 where 

y = –y

1

. The inputs are tied 

together where 

u = u

1

= u

2

.

Sys1

Sys2

+

y

u

u1

u2

y1

y2

Sys1

Sys2

–

y

u

u1

u2

y1

y2