National Instruments 370753C-01 Manual De Usuario

append( )

 performs a check to make sure both 

Sys

1

 and 

Sys

2

 have the 

same sample rate, and adopts this rate for the appended system. Any initial 
conditions on the states are also appended columnwise.

Sys = connect(Sys1,{K,M,N})

The 

connect( )

 function performs a general interconnection around a 

system. This provides two basic capabilities: 

•

constant gain feedback

•

general input–output interconnection

In its simplest form, 

connect( )

 can be used to wrap constant gain 

feedback around a system. The keyword 

K

, used to specify feedback gain, 

also can be used to specify which outputs are fed back to the input of the 
system. By specifying the optional keywords 

M

 and 

N

, you also can specify 

input and output gains.

General input–output interconnection is applicable to the block form 
system provided by 

append( )

, as described in the 

 section. 

Parameters used in the 

connect

 command are illustrated in Figure 3-3. 

Notice that feedback is defined with a positive sign.

Figure 3-3.  Parameters Used with the connect Command

1

0

0 A

2

=

1

0

0 B

2

=

1

0

0 C

2

=

1

0

0 D

2

=

u

1

u

k

u

y

y

1

Sys

1

N

Sys

M

+

+

K