Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 50)

3-26

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

C79000-G7076-C504-02

3.13 Editing in the Overwrite Mode

In the Block Editor you can change addresses or parameters conveniently

using the overwrite mode. You toggle between insert and overwrite mode

using the

INSERT key. You then overwrite your entries in the text boxes for

addresses or parameters.

The overwrite mode allows you to overwrite Ladder elements of the same

type. All boolean logic connections and parameters are retained.

This has the advantage that you do not have to enter the addresses and

parameters again. The Ladder element you want to overwrite can only be

replaced by a Ladder element of the same type. For example, you can

exchange a normally open contact for a normally closed contact, an R/S

flipflop for an S/R flipflop or exchange one timer for another.

To overwrite an existing Ladder element, select it and switch to the overwrite

mode with the

INSERT key. The Ladder element is overwritten as soon as you

insert another Ladder element of the same type.

I 0.0

I 0.1

I 1.1

I 1.2

I 0.2

Q 1.0

S_PULSE

TVS5T#10s

BCD

MW 2

MW 4

I 0.0

I 0.1

I 1.1

I 1.2

I 0.2

Q 1.0

S_ODT

TVS5T#10s

BCD

MW 2

MW 4

Overwrite

Figure 3-16 Overwriting Boxes

Overwriting

Addresses and

Parameters

Overwriting

Ladder Elements

Creating Logic Blocks

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