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The main structure of a model is shown below.

 

MODEL model_name -- Model_name is an arbitrary user specified name

INPUT           -- Declaration of input variables.

OUTPUT         -- Name of output variables

DATA             -- Name of data variables

VAR             -- Name of local variables

CONST           -- Name and values of constants (e.g. X {VAL:4.5})

 

comment   --Block between comment and endcomment ignored. The sign '--' causes the rest of the line to be ignored.

endcomment

 

INPUT, OUTPUT and DATA variables are passed into the model by ATPDraw. Variable and constants names are separated by ',' or carriage return.

 

E.g.:  

INPUT

 A1

 A2

OUTPUT

 N2, N3

 N4

DATA

 D1, D2

VAR

 X, Y, Z, N2, N3,N4 --Outputs must also be variables

CONST

 W {VAL:3}

 

HISTORY   -- Default values of variables and expressions {DFLT:n}

DELAY     -- Specify the number of required DELAY CELLS. Default 100.

INIT     -- Initialization block. Executed for time t=0 only.

ENDINIT

 

EXEC     -- Execution block. Executed once for each time step.

 

ENDEXEC

 

ENDMODEL