Lenze PLC Designer PLC Designer (R2-x) Manual do Utilizador descarregar pdf (Página 257)

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 DMS 3.2 EN 02/2011 TD29 255

7.2.4 Input Variable

Between the key words VAR_INPUT and END_VAR, all variables are declared that

serve as input variables for a POU. That means that at the call position, the value of

the variables can be given along with a call.

Example:

VAR_INPUT

iIn1:INT (* 1. Inputvariable*)

END_VAR

7.2.5 Output Variable

Between the key words VAR_OUTPUT and END_VAR, all variables are declared that

serve as output variables of a POU. That means that these values are carried back to

the POU making the call. There they can be answered and used further.

Example:

VAR_OUTPUT

iOut1:INT; (* 1. Outputvariable*)

END_VAR

7.2.6 Input and Output Variables

Between the key words VAR_IN_OUT and END_VAR, all variables are declared that

serve as input and output variables for a POU.

 Stop!

With this variable, the value of the transferred variable is changed ("transferred as a

pointer", Call-by-Reference). That means that the input value for such variables

cannot be a constant. For this reason, even the VAR_IN_OUT variables of a function

block can not be read or written directly from outside via

<functionblockinstance><in/outputvariable>.

Example:

VAR_IN_OUT

iInOut1:INT; (* 1. Inputoutputvariable *)

END_VAR

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