Siemens NAN 67 Series Manual de Serviço descarregar pdf (Página 29)

100

101

3-5

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

Table 3-1 Relationship between Variable Declaration and Code Section

Action in the Variable Declaration Reaction in the Code Section

New correct entry If invalid code exists, previously

undeclared variable becomes valid

Correct name change without type change Symbol is immediately shown

everywhere with new name

Correct name is changed to an invalid name Code is not changed

Invalid name is changed to a correct name If invalid code exists, it becomes

valid

Type change If invalid code exists, it becomes

valid and if valid code exists, it

becomes invalid

Symbol deleted that is being used in the code Valid code becomes invalid

Comment change None

Incorrect entry of a new variable None

Deleting an unused variable None

Initial value change None

Creating Logic Blocks

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 317 318

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