Siemens NAN 67 Series Manual de servicio descargar pdf (Pagina 40)

100

101

3-16

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

C79000-G7076-C504-02

You cannot create branches that cause a short circuit. Figure 3-9 shows an

example:

I 1.0 I 1.2 I 1.4 Q 6.0

Illegal Short Circuit

✗

Figure 3-9 Short Circuit in a Ladder Network (Illegal)

The starting point of a branch for a box connection must always be the left

power rail. Logic or other boxes can, however, exist in the branch before the

box.

Boxes must not be placed within a T-branch. Exceptions to this are compare

boxes. Figure 3-10 shows an example:

I 1.0 I 1.2 I 1.4 Q 6.0

Box illegal at this

position

✗

Box

T branch

Figure 3-10 Box in a T-Branch (Illegal)

Coils are automatically placed at the right end of a network where they form

the branch end.

Exceptions: Coils for Midline Outputs (#) and Positive (P) or

Negative (N) RLO Edge Detection cannot be placed on the extreme left

or the extreme right of a branch. Nor are they permitted in parallel branches.

Short Circuit

Placing Boxes

Placing Coils

Creating Logic Blocks

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 317 318

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