Lenze DDS v2.3 Manual do Utilizador descarregar pdf (Página 30)

Drive PLC Developer Studio

Program example

3-8

DDS EN 2.3

Process

The first interrogation establishes whether Q is already set to TRUE ( TRUE: timer running). [

Line 1

]

• If QisTRUE, we will not change the assignment of DELAY but instead call function block

DELAY without input (to check whether the time has already expired). [

Line 10

]

• If QisFALSE, we will set the variable IN in DELAY to FALSE and thus at the same time ET

to 0 and Q to FALSE.[

Line 4

]

All variables are now set to the desired initial status.

– Now save the time required from variable SETTIME in variable PT [

Line 5/6

], and call DELAY

with IN:= TRUE.[

Line 7

]

– In the function block DELAY , the variable ET will now be counted up until it reaches the

value SETTIME ; then Q will be switched to FALSE .

• The negated value of Q will be saved after every WAIT cycle in OK [

Line 14/15

]

• As soon as Q becomes FALSE, OK becomes TRUE.

The timer is complete.

3.2.7 The main program PLC_PRG

The organization unit PLC_PRG is the main program for calling the two function blocks WAIT and

TRAFFICLIGHT .

29.To edit the organization unit PLC_PRG, activate its editor window by selecting

Object Organizer,

tab

Organization units

and double-clicking PLC_PRG .

3.2.7.1 Declaration

To ensure that the function blocks created before can be used in PLC_PRG , it is necessary to declare

instances of these function blocks. The traffic light example requires two instances of the function

block TRAFFICLIGHT ( LIGHT1, LIGHT2) and one instance of the function block WAIT ( WAIT1).

30.Use the declaration editor to declare as local variable (between the keywords VAR and

END_VAR) the variables for the required instances.

3.2.7.2 Sequential function chart

The start-up diagram of an organization unit in SFC always consists of an action Init, a subsequent

transition Tra ns0 and a jump back to Init.

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