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6-2

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

C79000-G7076-C504-02

6.1 Elements and Boxes

Ladder instructions consist of elements and boxes which are connected

graphically to form networks. The elements and boxes can be classified into

the following groups:

STEP 7 represents some ladder logic instructions as individual elements that

need no address or parameters (see Table 6-1).

Table 6-1 Ladder Logic Instruction as Elements without Addresses or Parameters

Element Name Section in This Manual

NOT

Invert Power Flow 8.6

STEP 7 represents some ladder logic instructions as individual elements for

which you need to enter an address (see Table 6-2). For more information on

addressing, see Chapter 7.

Table 6-2 Ladder Logic Instruction as an Element with an Addres

Element Name Section in This Manual

Normally Open Contact 8.2

STEP 7 represents some ladder logic instructions as individual elements for

which you need to enter an address and a value (such as a time or count

value, see Table 6-3).

For more information on addressing, see Chapter 7.

Table 6-3 Ladder Logic Instruction as an Element with an Address and Value

Element Name Section in This Manual

Value

Retentive On-Delay Timer

Coil

8.16

Ladder

Instructions

Instructions as

Elements

Instructions as

Elements with

Address

Instructions as

Elements with

Address and Value

Configuration and Elements of Ladder Logic

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